Tellabs 4001C User manual

il!itellabs
technical manual
76-844001C
rev A
practice section
844001C
©Tellabs, Inc., 1August 1986
all rights reserved, printed in USA
4001C Prescription Line Amplifier
1. general description
1.01 The 4001CPrescription Line Amplifier mod-
ule (figure
1) provides active prescription level con-
trol, active prescription
amplitude equalization, and
impedance matching for the transmit and receive
channels of a 4wire voice-frequency transmission
facility. The
4001C also contains two independent
sealing-current sources, one on the facility side and
the other on the terminal side of the module.
Note: Because the 4001C has identical equalizers
in both channels, identical impedance-matching
capabilities at all four ports, and identical sealing-
current sources on the facility and terminal sides, it
can
be used either at an intermediate point or near
an end point of a 4wire facility. Although the terms
"facility side" and "terminal side" do not strictly
apply in intermediate applications, these terms will,
for convenience, be used throughout this practice
as follows: Facility side will refer to the receive
input,
transmit-output side of the 4001C, and ter-
minal side will refer to the transmit-input, receive-
output side as shown on the block diagram in
section 5 of this practice.
1.02 This practice section is reissued to cover the
Issue 4version of the 4001C module (Tellabs part
number 844001 C). The Issue 4 module is identical
to its Issue 3
predecessor except for the addition of
afront-panel power-on indicator LED.
1.03 The 4001C's
transmit and receive amplifiers
can be
independently prescription-set to provide
from 0to
24dB of loss or 0to 24dB of gain in their
respective channels. For each channel, gain or loss
is
selected via afront-panel slide switch. The de-
sired
amount of gain or loss is then introduced into
each channel in precise 0.1 dB increments via a
front-panel DIP switch. The maximum
output level of
each channel is +10dBm, with distortion at max-
imum
output less than 1percent.
1.04 All
four ports of the 4001C module can be
switch-optioned for balanced 1200, 600, or 150-
ohm
terminating impedance. The impedance of the
two facility-side ports is selected independently
from that of the two terminal-side ports. The trans-
formers
at all four ports of the module are center-
tapped to derive balanced simplex leads.
•
•
contents
section 1 general description
section 2 application
section 3 installation
section 4 circuit description
section 5 block diagram
section 6 specifications
section 7 testing and troubleshooting
page 1
page 2
page 4
page 8
page 10
page 9
page 11
figure 1. 400 1C Prescription Line Amplifier
1.05 In addition to active prescription level-control
circuitry, the 4001Ccontains active prescription
slope-type amplitude-equalization circuitry in both
channels. The
transmit and receive equalizers are
identical,
each providing from 0 to 7.5dB of gain at
2804Hz (re 1004Hz). Equalization is introduced into
each
channel independently, in 0.5dB increments,
via DIP
switches on the module's front panel.
1.06 The
4001C can be optioned to provide
25mA of internally generated sealing current to
metallic facilities on the facility and terminal sides
of the module, to accept externally generated seal-
ing
current from the far ends of the facilities on both
sides of the module, to derive normal simplex leads
on
both sides of the module, or to provide bypassed
(straight-through) simplex-lead signaling via apath
separate from
the transmit and receive transmission
paths. Each of
the 4001C's two internal sealing-
current sources has a"ZAP" feature by which a
greater amount of sealing current is provided for a
few seconds when power is initially applied to the
module.
1.07 The
front panel of the 4001C is designed so
that all level and equalization adjustments can be
made
while the module is mounted in place. Six
front-panel
bantam-type test jacks facilitate align-
ment and maintenance. Both bridging and opening
jacks are provided at the facility-side ports; opening
jacks alone are provided at the terminal side ports.
Front-panel
seal curr 1and seal curr 2LED's light
when the module's internal facility-side and ter-
minal-side sealing-current options, respectively, are
activated and sealing
current is flowing. Also
located on the front-panel is a
pwr on LED that
lights when
power is applied to the module.
page 1

practice section 844001C
1.08 An internally regulated power supply per-
mits
the module to operate on filtered, ground-
referenced
-22 to -56Vdc input. If the internal-
sealing current option is selected, input power
must be from - 42 to - 56Vdc. Maximum current
requirements (at - 48Vdc input) are as follows:
•With both
sealing-current sources inactive, 30mA
at idle and 65mA at maximum transmit and
receive output levels.
•With
one sealing-current source active, 57mA at
idle and 92mA at maximum output levels.
•With both sealing-current
sources active, 84mA
at idle and 132mA at maximum output levels.
1.09 Surge
protection is provided for the input
and output of the transmit and receive amplifiers.
Reverse-battery
protection and transient limiting
are provided
for the module's internal power-supply
circuitry.
1.10 AType 10 module,
the4001C mounts in one
position of aTellabs Type 10 Mounting Shelf, ver-
sions of which are available for relay-rack or appa-
ratus-case installation.
In relay-rack applications, up
to 12
modules can be mounted across a19-inch
rack, while up
to 14 modules can be mounted
across a 23-inch rack. The 4001C can also be used
in
the Tellabs 246 Resistive Data Bridge System, in
which case
the module mounts in one position of
the Tellabs 246 Mounting Assembly. The 246
Assembly, basically aprewired Type 10 Shelf
equipped with a connectorized printed-circuit back-
plane,
houses up to 12 modules and mounts in a
19-inch relay rack. The
246 Assembly and all rack-
configured Type 10 Shelves each occupy 6 inches
of vertical rack space.
2.02
Because equalization is available in both
channels (instead of in the receive channel only),
the 4001C can be used not only as aterminal
repeater but also as an intermediate repeater.
Figure 2
shows atypical off-premises-station (OPS)
circuit in which the 4001C is used in avariety of
applications.
2.03 The
4001C can also be used in the Tellabs
246 Resistive Data Bridge System, where each
module provides an active interface between an
external 4wire facility and the passive fixed-loss
data bridge. Figure 3 shows atypical configuration
for two 4wire 6way fixed-loss data bridges.
level control
2.04 Prescription level-control circuitry allows
from 0
to 24dB of gain or loss to be introduced into
each
channel of the 4001C independently. For
each channel, either flat gain or flat loss is selected
via afront-panel slide switch. The precise amount
of gain or loss required in the channel is then
selected in 0.1 dB increments, via an eight-position
front-panel DIP switch.
amplitude equalization
2.05 The 4001C's active slope-type amplitude
equalizers allow from 0 to 7.5dB of prescription-set
gain
at 2804Hz (re 1004Hz) to be introduced into
the module's receive and transmit channels indivi-
dually.
Adjustable in 0.5dB increments via front-
panel DIP switches,
this type of equalization is
ideal
for nonloaded cable and can also be used
effectively in many loaded-cable applications to
compensate for the frequency-response charac-
teristics of metallic facilities interfacing the module.
2. application
2.01 The 4001C Prescription Line Amplifier with
sealing
current is designed for use on 4wire voice-
frequency transmission facilities, where it provides
active prescription level control, active prescription
amplitude equalization, and impedance matching
in both the transmit and receive channels. The
module also contributes longitudinal isolation and
surge protection for the facility. In itself, the 4001C
module is equivalent to a 4wire-to-4wire (44V4)
voice-frequency repeater. When used with aTellabs
420X Terminating Set (or equivalent), a 2wire-to-
4wire (24V4) repeater results.
common multiple common mUltiple~
port/ ports ~portr ports "-
I~I~'~IJ~
uuuuu u u
.....
.....
.....
..... .....
.....
.....
o 000 0000 0 0 00
0 0 0 0 0 0000 0 00
~
~ ~ ~ ~ ~ ~
~~
~ ~
~
figure 3. Module arrangement for two 4wire 6way resistive
data
bridges in aTellabs 246 Mounting Assembly
x
"'
"'-
-- B
TERM
SET
420(X)
4001C 6101/
6104
,---
CO 3
4001C
600 ohm termination 600 ohm termination
12~::: ::nati: _r____ ~ <:. , intermediate application
:\ I j-y i- ·I~
• • • •• 1
!- LINE CXA ~"""""'I'l CXA LINE LINE t1 f·- LINE SF SIG
AMP AMP AMP f- AMP (FLAI
- V-f 1.
••
loaded cable • .J
CO 1
1200 ohm termination
600 ohm ~nation \
TERM SF SIG LINE
SET I FSAI AMP
420(XI 6101/ 4001C 400lC
6103
figure 2. Typical off-premises-station (OPS) circuit using 400 1C Line Amplifiers
page 2

practice section 844001C
10
figure 4. Typical transmit and receive equalizer
response curves
2.06 Whether one or both channels' equalizers
are used depends upon the 4001C's position in the
circuit. Use of the module as an amplifier at an
intermediate
point in a 4wire circuit, for example,
Note: Because introduction of equalization into
either channel of the 4001C does not affect
1004Hz levels, equalization can be introduced not
only before but after transmission levels are set.
table 2. Terminating impedance selection guidelines
often requires the use of the transmit equalizer as
well as
the receive equalizer. In any case, equaliz-
ing
at the receive end of a circuit (post-equaliza-
tion) is
generally preferable to equalizing at the
transmit end (pre-equalization). Pre-equalization
tends to amplify high-frequency signals to alevel
that is conducive to crosstalk. Post-equalization
not only eliminates this problem but also expedites
the equalization process because the circuit is
easier to equalize at the receive end. In some
applications, however, pre-equalization may be
necessary because post-equalization at the re-
ceive
end is unavailable.
impedance matching
2.07 Impedance-matching transformers at all
four ports of the 4001C can be switch-optioned for
balanced 1200, 600, or 150-ohm terminating im-
pedance. A
single option switch selects the desired
impedance for both facility-side ports (receive input
and transmit output); a second option switch per-
forms
this function for both terminal-side ports
(receive output and transmit input). Thus, on both
the facility and terminal sides, the 4001C can inter-
face a variety of facilities and equipment, as listed
in
table 2. The 150-ohm options provide asmall
amount of slope equalization for long sections of
nonloaded
cable through the deliberate impe-
dance mismatch.
impedance
facility or equipment interfaced
1200 ohms loaded cable
----
600 ohms nonloaded cable, carrier, SF and DX
signaling units, terminating sets,
station apparatus
----_.
._-------_._.
------
150 ohms small amount of slope-type amplitude
equalization for long sections of non-
loaded cable through the deliberate
impedance mismatch
I rr
~ ~~
<t, q. <t,
//
/5.0 SETTING
7.5 SETTING
"d-<t, "d><t,
g/ /
/ ~/'
: __ -'- 2.5 SETTING
0.0 SETTING
r
~ \.
FREQUENCY (Hz)
The equalized gain response of each module is not
affected by flat gain or loss adjustments, which are
used
to provide precise transmission alignment.
The frequency response of the equalizers is shown
graphically in figure 4and in tabular format in table 1.
It
8
61
iD
~4
~
..
'-'
2 ~
I
0
-2
-4
t
'"
'i
'b
'"
'b
It
receive
equalizer equalized gain (dB)
introduced at various frequencies
switch
setting(dB)
300Hz 400Hz 500Hz
800Hz 1004Hz 1500Hz
1800Hz
2500Hz
2804Hz
a0.0 0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0
0.5 -0.23
-0.19 -0.15 -0.06
0.0 +0.15 +0.24 +0.43
+0.50
1.0
-0.52 -0.42 -0.33 -0.13
0.0
+0.32
+0.52 +0.93
+1.07
1.5
-0.75 -0.60 -0.49 -0.18
0.0
+0.46
+0.74
+1.33 +1.54
2.0
-1.00
-0.80 -0.64 -0.24
0.0 +0.61 +0.98 +1.76 +2.04
2.5
-1.22 -0.98 -0.78 -0.29
0.0 +0.75
+1.20 +2.15 +2.49
3.0 --1.50
-1.20
-0.95 -0.36
0.0 +0.90 +1.45 +2.60
+3.01
35
-1.71 -1.37
-1.09
-0.41 0.0 +1.03 +1.65 +2.97 +3.45
4.0 -2.02 -1.63 -1.29
-0.49
0.0 +1.22 +1.95 +3.54
+4.12
4.5
-2.25 -1.79 -1.42
-0.53 0.0 +1.33 +2.14
+3.90 +4.56
50 -2.49 -1.98 -1.57
-0.59 0.0 +1.47
+2.36
+4.32
+5.08
5.5
-2.68 -2.14 -1.69
-0.63 0.0 +1.58
+2.53
+4.67 +5.51
6.0 -2.89
-2.30 -1.81
-0.68
0.0
+1.69
+2.72 +5.05 +5.99
65 -3.07 -2.44 --1.93
-0.72 0.0 +1.79
+2.87 +5.38 +6.41
7.0
-3.29 -2.61
-2.05
--0.76 0.0 +1.89
+3.05 +5.76 +6.90
7.5 -3.45 -2.74 -2.15
-0.78 0.0 +1.98 +3.19
+6.06
+7.30
table 1. Typical transmit and receive equalization frequency response
page 3

practice section 844001C
sealing current and simplex leads
2.08 The 4001C contains two separate and in-
dependent 25mA sealing-current sources, one on
the facility side and one on the terminal side of the
module. In addition, all four impedance-matching
transformers on the 4001C are center-tapped to
derive balanced simplex (SX) leads. Option
switches on the facility and terminal sides of the
module afford a choice of four sealing-current and
simplex-lead options, as follows:
•
When the 4001C's internal sealing-current op-
tion on
the facility side is selected, 25mA of seal-
ing
current flows from the transmit output port
(pins 41 and 47) and returns via the receive
input port (pins 7 and 13). When the 4001C's
internal sealing-current option on the terminal
side is selected, 25mA of sealing current flows
from the transmit input port (pins 55 and 49) and
returns via the receive output port (pins 5 and
15). Both sealing-current sources have aZAP
feature that provides a greater amount of cur-
rent for a few seconds when power is initially
applied to the module. Each of the two front-
panel
seal curr LEOs lights when its respective
source is active and current is floWing.
• A
second sealing-current/simplex-Iead option
available independently on the facility and ter-
minal
sides of the 4001C excludes the module's
sealing-current sources from the circuit and pro-
vides return
paths for sealing current applied at
the distant end of the facilities.
• A third
option is the derivation of normal simplex
leads on either or both sides of the module. This
allows the 4001C to be used on circuits employ-
ing OX, loopback, or other de signaling schemes
(see figure 5). Normal simplex leads can also be
used to apply sealing current to a metallic facility
from alocal source external to the module.
•The
fourth sealing-current/simplex-Iead option is
bypassed simplex-lead signaling. This option
provides a straight-through simplex-lead signal-
ing path
between the module's facility and ter-
minal
sides that is completely separate from the
module's transmit and receive transmission
paths. A switch option available when bypassed
simplex-lead signaling is selected provides
either a normal straight-through signaling path
(RCV IN SX to RCV OUT SX and XMT IN SX to
XMT OUT SX) or areversed straight-through
signaling path (RCV IN SX to XMT IN SX and
RCV
OUT SX to XMT OUT SX). The reversed
signaling-path option is used to compensate for
polarity reversals in duplex- (DX-) signaling and
ground-start applications.
3. installation
inspection
3.01 The 4001C Prescription Line Amplifier mod-
ule
should be visually inspected upon arrival to find
possible
damage incurred during shipment. If
damage is noted, aclaim should immediately be
filed
with the carrier. If stored, the module should be
visually
inspected again prior to installation.
mounting
3.02 The 4001C module mounts in one posi-
tion
of aTellabs Type 10 Mounting Shelf, which is
available in
configurations for relay-rack and
apparatus-case installation, or in one position of a
Tellabs
246 Resistive Data Bridge Mounting
Assembly. The module plugs physically and elec-
trically into a 56-pin connector at the rear of its
shelf or assembly position.
installer connections
3.03 Before making any connections to the
mounting shelf or assembly, ensure that power is
off and modules are removed. Modules should be
put into place only after they are properly optioned
and after wiring is completed. When installing
4001C
modules in 246 Assemblies, refer to the
Tellabs practice on the 246 Resistive Data Bridge
System
for cabling instructions and module pinout
assignments.
3.04 Table 3lists external connections to the
4001C module. All connections are made via wire-
wrapping to the 56-pin connector at the rear of the
module's mounting shelf position. Pin numbers are
found on the body of the connector.
strap options
3.05 As shipped from Tellabs, connector pin 43 is
the 4001C's XMT OUT SX lead and connector pin 3
is
the RCV OUT SX lead. If an additional (or alterna-
tive)
connector-pin appearance for the XMT OUT SX
lead is
desired on pin 45, install option strap ST9
terminal application
intermediate application
~ -I.------ I-.------
TERM
RT
4001C 4001C
PAD/ ~_ TERM
T
SET
RR
LINE
r---- SX
SXL..--
LINE
I----'SX
SX - ~N~~ RR 4~gl
T
420(X) AMP AMP
R
TT
TT R
TR
I-- SX
SXr--- ~SX
SX_
TR
~
-I
'-
I-
'--
EE
DXSET r-
----j ox SET
MI
6001/2 6001/2
•M
figure 5. Typical 4wire OX signaling application using 400 1C Line Amplifiers
page 4

practice section 844001C
figure 6. 400 IC option switch and strap locations
Caution: Extreme care must be taken when
soldering
on printed circuit boards to prevent
damage to the delicate foil. Use a soldering iron
with atip temperature or BOO°F or less, use only
60/40 or 63/37 tin/lead rosin-core solder, and do
not hold the tip of a hot iron on a solder connec-
tion for longer than 2seconds.
table 3. External connections to 4001C
where indicated on the module's printed circuit
board, as shown in figure 6. If an additional (or alter-
native)
connector-pin appearance for the RCV OUT
SX lead is desired on pin 3, install option strap 5T10
where indicated on the module's printed circuit
board (also shown in figure 6). Before installing 5T9
or 5T1 0, be sure to observe the caution below.
3.07
Terminating Impedances. Switch 51
selects the terminating impedances at the 4001C's
facility-side ports (rcv in and xmt out). Switch 53
performs the same function for the 4001C's
terminal-side ports (rcv out and xmt in). Set each
switch to the 1200, 600, or 150 position as required.
Ingeneral, 1200-ohm impedance is used to inter-
face
nonloaded cable, 600-ohm impedance is used
to interface non loaded cable, carrier, SF or OX
signaling units, terminating sets, or station appa-
ratus,
and 150-ohm impedance is used to provide a
small
amount of slope equalization through the
deliberate impedance mismatch when the module
interfaces long sections of nonloaded cable (see
paragraph 2.07).
3.08 Facility-Side
Sealing-Current /SX-Lead
Options.
Switch 56 conditions the 4001C to supply
internally generated 25mA sealing current, to
accept externally supplied sealing current from the
distant end of the facility, or to derive normal sim-
plex
leads on the facility side. Select the desired
facility-side sealing current/SX-Iead arrangement as
follows:
•For normal SX-Iead derivation on
the facility-
side,
set 56 to 5X.
•For
internally generated 25mA sealing current
on the facility side, set 56 to 50URCE.
•To provide areturn path for sealing current
applied from the far end on the facility side, set
56 to 5INK.
Note 1: For instructions on setting S6 for a by-
passed signaling arrangement, see paragraph 3.10.
Note 2: When switch S6 is set to either SX, SINK,
or SOURCE, switch S8 is nonfunctional and can
therefore be left in either the REV or NORM
position.
3.09 Terminal-Side Sealing-Current/SX-Lead
Options. Switch 57 conditions the 4001C to supply
internally generated 25mA sealing current, to
accept externally supplied sealing current from the
far end of the facility, or to derive normal simplex
leads on the terminal side. Select the desired
terminal-side or sealing-current/SX-lead arrange-
ment as follows:
•For
internally generated 25mA sealing current
on the facility side, set 57 to 50URCE.
• To provide areturn path for sealing current
applied from the far end on the facility side, set
57 to 51NK.
• For normal SX-Iead derivation on the terminal
side,
set 57 to 5X.
Note 1: For instructions on setting S7 for a
bypassed signaling arrangement, see paragraph
3.10.
Note 2: When S7 is set to either SX, SII\I K, or
SOURCE, switch S8 is nonfunctional and can
therefore be left in either the REV or NORM
position.
3.10 Bypassed Signaling. For bypassed signal-
ing,
i.e., to provide a straight-through SX-Iead signal-
ing path
separate from the 4001C's transmission
paths,
set switches 56, 57, and 58 as follows:
page 5
NORM
~~~ ~H
57 § REV 56 66
00:
~!
84-4001C
connect: to pin:
XMT OUT TI P 41
XMT OUT RING 47
XMT OUT SiMPLEX 43 and 45
RCV IN TiP 7
RCV IN RING 13
RCV IN
SiMPLEX 9 and 11
XMT IN TiP 55
XMT IN RING 49
XMT IN SiMPLEX 51 and 53
RCV OUT TiP 5
RCV OUT RING 15
RCV
OUT SIMPLEX , 1 and 3
-BATT (filtered -22 to -56Vdc in)* 35
GND (ground) 17
*If one or both internal sealing-current sources are to be
used, input power must be between -42 and -56Vdc.
switch options
3.06 Five option switches must be set before the
4001C can be placed into service. Locations of
these switches on the module's printed circuit
board are shown in figure 6, and instructions for set-
ting the switches are given in paragraphs 3.07 and
3.08.
Note: All switches on the front panel of the 4001C
are used for alignment and are covered in para-
graphs 3.09 through 3.14.
t
t
t

practice section 844001C
• For anormal straight-through signaling path
(RCV IN SX
to RCV OUT SX and XMT IN SX to
XMT OUT SX), set 56 and 57 to BYP and 58 to
NORM.
• For areversed straight-through signaling path
(RCV IN SX
to XMT IN SX and RCV OUT SX to
XMT OUT SX), as required to compensate for
polarity reversals in OX-signaling and ground-
start applications, set 56 and 57 to BYP and 58
to REV.
alignment
3.11 This alignment procedure is divided into
three parts: gain adjustment, output level adjust-
ment,
and equalization. The gain adjustment pro-
cedure (paragraph 3.12) covers local prescription
alignment for applications where the circuit-Iayout-
record (CLR) transmission requirement is expressed
in terms
of expected measured gain (EMG). If the
CLR transmission requirement is expressed in
terms of transmission level points (TLP's), the
output level adjustment procedure (paragraph
3.13), which
covers composite prescription align-
ment of the circuit in which the module is used,
should
be performed instead. If equalizer settings
are not given on the CLR or if the given settings do
not adequately equalize the facility, frequency re-
sponse measurements should be taken and the
module's equalizer set as described in paragraphs
3.14 through 3.17. Because the equalizers do not
affect 1004Hz transmission levels, equalization may
be introduced after transmission levels are set.
gain adjustment (for levels expressed as EMG)
3.12 If the CLR transmission requirement is
expressed as EMG, proceed as directed below. If
the transmission requirement is expressed as
TLP's,
proceed instead to paragraph 3.13.
Note: When the GLR transmission requirement is
expressed as EMG, both the transmit and receive
portions of the transmission measuring set (TM5)
used for alignment must be optioned for 600 ohms.
receive channel:
A. Determine from the CLR whether gain or loss is
required in
the receive channel, and set the
front-panel rev gain/loss switch to gain or loss
as appropriate.
B. Set all front-panel rev level DIP switches for
zero gain or loss, i.e., to the out position.
C. If you have not already done so, insert the mod-
ule
into its mounting and apply power.
D. Determine from the CLR the amount of receive-
channel gain or loss (in dB) required. Call this
amount G rev.
E. Arrange the transmit portion of a TMS for
1004Hz tone output at a -G rev dBm level and
for 600-ohm impedance and connect it to the
module's rev in jack.
F. Arrange the receive portion of the TMS for 600-
ohm terminated measurement and connect it to
the module's rev out jack.
G. Set to in that combination of front-panel rev
level DIP
switches which adds up to the
page 6
required amount of gain or loss, as verified by a
OdBm
reading on the TMS.
transmit channel:
H. Determine from the CLR whether gain or loss is
required in the transmit channel, and set the
front-panel
xmt gain/loss switch to gain or loss
as appropriate.
E. Set all front-panel xmt level 01 P switches for
zero gain or loss, i.e., to the out position.
J. Determine from the CLR the amount of transmit-
channel gain or loss (in dB) required. Call this
amount Gxmt.
K. Arrange the transmit portion of the TMS for a
1004Hz output at a -G xmt dBm level and for
600-ohm impedance, and connect it to the mod-
ule's xmt in jack.
L. Arrange the receive portion of the TMS for 600-
ohm terminated measurement, and connect it
to the module's xmt out jack.
M. Set to in that combination of front-panel xmt
level DIP switches which adds up to the
required amount of gain or loss, as verified by a
OdBm reading on
the TMS.
output level adjustment (for levels expressed
as TLP's)
3.13 If the CLR transmission requirement is
expressed as TLP's, proceed as directed below.
Please
be aware that this procedure requires end-
to-end measurements.
Note: If the GLR transmission requirement is
expressed as TLP's, both the transmit and receive
portions of the local transmission measuring set
(TM5) must be optioned to match the impedance of
the module ports to which they are connected. If
this is not possible due to the type of TM5 available,
reoption the module to match the impedance of the
TM5 while alignment is performed, and be certain to
reoption the module appropriately after alignment is
completed.
receive channel:
A. Set all front-panel rev level DIP switches for
zero gain or loss, i.e., to the out position.
B. If you have not already done so, insert the mod-
ule
into its mounting and apply power.
C. Arrange the receive portion of aTMS for ter-
minated measurement at the terminal-side
impedance selected on the module (see note
above), and connect it to the module's rcv out
jack.
D. Request personnel at the distant (facility-side)
end of the circuit circuit to send 1004Hz tone at
the CLR-specified level. Record the level obser-
ved on
the local TMS; this level is the receive
input level because the module is now optioned
for zero gain or loss and no equalization.
E. Refer to the CLR to obtain the required receive
output level. Determine the difference between
the measured receive input level and the
required receive
output level.
F. Depending upon whether gain or loss is
required (as determined in the preceding step),

t
t
t
set the module's front-panel rcv gain/loss
switch to gain or loss as appropriate.
G. Then set to in that combination of front-panel
rcv level 01 P switches which adds up to the dif-
ference determined in step E, as verified by a
proper receive output level reading on the local
TMS.
transmit channel:
H. Set all front-panel xmt level 01 P switches for
zero gain or loss, i.e., to the out position.
I. Arrange the transmit portion of the TMS for
1004Hz tone output at the CLR-specified
transmit input level and for the terminal side
impedance selected on the module (see note
above), and connect it to the module's xmt in
jack.
J. Request personnel at the distant (facility-side)
end of the circuit to measure and report the
level of the received 1004Hz tone.
K. Determine the difference between the actual
received level at the distant end and the
desired level at that end.
L. Depending upon whether gain or loss ;s
required to achieve the desired level at the dis-
tant end (as determined in the preceding step),
set the module's front-panel xmt gain/loss
switch to gain or loss as appropriate.
M. Set to in that combination of front-panel xmt
level DIP switches which adds up to the dif-
ference determined in step K, as verified by a
proper receive input level at the distant end of
the circuit.
equalization adjustment
3.14 To adjust the 4001 C's receive and transmit
active slope equalizers when prescription equaliza-
tion settings (i.e., the amount of equalized gain at
2804Hz re 1004Hz required for each channel) are
given in the CLR, simply set the module's front-
panel rev eql and xmt eql DIP switches appro-
priately, as directed in paragraph 3.15. If, however,
prescription equalization settings are not given in
the CLR or if the given settings do not provide ade-
quate results, it is necessary to perform equaliza-
tion adjustment as directed in paragraphs 3.16
through 3.18.
3.15 Prescription Receive
and Transmit Equal-
ization.
Equalization is introduced via the front-
panel rcv eql and xmt eql DIP switches. The specific
amount of equalized gain at 2804Hz (re 1004Hz)
introduced via each individual DIP-switch position is
indicated on the front panel adjacent to the switch.
These switch positions are cumulative; the total
amount of equalized gain (0 to 7.5dB) introduced
into a channel is the sum of that channel's 01 P-
switch positions set to in. Because the amounts of
required equalization given in the CLR may be
specified to the nearest 0.1 dB (while the rev eql and
xmt eql DIP switches are arranged in 0.5dB
increments), use the following guidelines for round-
ing
up or down when setting the switches: If, for
example, 0.3 to 0.7dB of equalized gain is required,
set the switches to introduce 0.5dB. If 0.8 to 1.2dB
practice section 844001C
of equalized gain is required, set the switches to
introduce 1dB. Similarly, if 1.3 to 1.7dB of equalized
gain is required, set the switches to introduce
1.5dB, and so on upward through the switches'
range. If no equalization is required for achannel,
ensure that all of that channel's equal 01 P-switch
positions are set to out.
3.16 Non-Prescription Receive-Channel Post-
Equalization Adjustment. To determine the need
for receive-channel post-equalization at the local
end of the facility, and to adjust the module's
receive equalizer when prescription settings are not
given in the CLR, proceed as follows:
A. Ensure that all front-panel rcv eql DIP-switch
positions are set to out for no equalization. Then
remove the module from its mounting position,
ensure
that both terminating-impedance switches
(51 and 53) are correctly set, and reinsert the
module into its mounting position.
B. Arrange the receive portion of a transmission
measuring set (TMS) for terminated measure-
ment at the terminal-side interface impedance
selected on the module. Connect the receive
portion of the TMS to the module's rcv out jack.
(The
transmit portion of the TMS must remain
disconnected from the module at this time.)
Note: If the TM5 does not provide an impedance
setting that matches the impedance selected on the
module,
reoption the module as necessary for apro-
per impedance match during this procedure. Then,
when this
procedure is completed, reset the mod-
ule's
impedance as required.
C. Have the distant facility-side end send 1004Hz
test tone at the CLR-specified level. Verify that
the TMS reading equals the CLR-specified
receive level; then measure and record the
level.
D. Now have the distant facility-side end send
2804Hz test tone at the CLR-specified level.
Measure and record the received 2804Hz tone
level. Subtract this 2804Hz level from the
1004Hz level measured in step C.
E. Set to in the proper combination of rcv eql DIP
switches that approximates as closely as pos-
sible the measured difference, i.e., the amount
of equalized gain required, as specified in table 4.
3.17 Non-Prescripion Transmit-Channel Post-
Equalization for Intermediate Applications. In
intermediate-repeater applications, transmit-channel
equalization is often used to post-equalize the input
to the module's transmit channel in the same man-
ner as the module's receive equalizer. In such
applications, to determine the need for transmit-
channel post-equalization at the local end of the
facility interfacing the module's "terminal" side, and
to adjust the module's transmit equalizer when pre-
scription settings are not given in the CLR, proceed
as follows:
A. Ensure that all front-panel xmt eql DIP-switch
positions are set to out for no equalization. Then
remove the module from its mounting position,
ensure that both terminating-impedance
page 7

practice section 844001C
1004Hz-2804Hz
amount of equalized
difference gain required
0.0 to 0.2dB O.OdB
0.3 to 0.7dB 0.5dB
0.8
to 1.2dB 1.0dB
1.3
to 1.7dB 1.5dB
1.8
to 2.2dB 2.0dB
2.3
to 2.7dB 2.5dB
2.8
to 3.2dB 3.0dB
3.3
to 3.7dB 3.5dB
3.8
to 4.2dB 4.0dB
4.3
to 4.7dB 4.5dB
4.8
to 5.2dB 5.0dB
5.3
to 5.7dB 5.5dB
5.8
to 6.2dB 6.0dB
6.3
to 6.7dB 6.5dB
6.8
to 7.2dB 7.0dB
7.3
to 7.7dB 7.5dB
table 4. Equalized gain settings tram cable loss data
switches (51 and 53) are correctly set, and rein-
sert the module into its mounting position.
B. Arrange the receive portion of atransmission
measuring
set (TMS) for terminated measure-
ment at the facility-side interface impedance
selected on the module. Connect the receive
portion of the TMS to the module's xmt out jack.
(The
transmit portion of the TMS must remain
disconnected from the module at this time.)
Note: If the TM5 does not provide an impedance
setting that matches the impedance selected on the
module,
reoption the module as necessary for a pro-
per impedance match during this procedure. Then,
when this
procedure is completed, reset the mod-
ule's
impedance as required.
C. Have the distant terminal-side end send
1004Hz test tone at the CLR-specified level.
Verify
that the TMS reading equals the CLR-
specified receive level; then measure and
record
the level.
D. Now have the distant terminal-side end send
2804Hz test tone at the CLR-specified level.
Measure and record the received 2804Hz tone
level.
Subtract this 2804Hz level from the
1004Hz level mesured in step C.
E. Set to in the proper conbination of rcv eql DIP
switches
that approximates as closely as pos-
sible
the measured difference, i.e., the amount
of equalized gain required, as specified in table 4.
3.18 Non-Prescription Transmit-Channel Pre-
Equalization for Terminal or Intermediate Appli-
cations. In both terminal and intermediate repeater
applications,
transmit-channel equalization (i.e., pre-
equalization)
at the local end of the facility is
normally
left flat (no equalization) in favor of
receive-channel post-equalization at the distant end
of the facility. In such applications, to determine the
need
for transmit-channel pre-equalization, and to
adjust the module's transmit equalizer when pre-
scription
settings are not given in the CLR, proceed
as follows:
A. Ensure that all front-panel xmt eql 01 P switches
are set to out for no equalization. If you have
not already done so, remove the module from
its
mounting position, ensure that both termi-
nating-impedance switches (51 and 53) are cor-
rectly set,
and reinsert the module into its
mounting position.
B. Connect the transmit portion of the TMS,
arranged
for the terminal-side interface impe-
dance selected on the module, to the module's
xmt in jack.
Note: If the TM5 does not proVide an impedance
setting that matches impedance selected on the
module, reoption the
module as necessary for apro-
per impedance match during this procedure. Then,
when this procedure is completed, reset the mod-
ule's
impedance as required.
C. Send test tone at 1004Hz and 2804Hz at the
CLR-specified transmit input level toward the
distant facility-side end. Have personnel at that
end measure
the received levels, subtract the
2804Hz level from 1004Hz level, and report the
result.
D. Set to in the proper combination of xmt eql DIP
switches that approximates as closely as pos-
sible
the reported difference, i.e., the amount of
equalized gain required, as specified in table 4.
4. circuit description
4.01 This circuit description is intended to fa-
miliarize you with
the 4001CPrescription Line
Amplifier for engineering and application purposes
only.
Attempts to troubleshoot the unit internally are
not recommended and may void your warranty.
Troubleshooting
procedures should be limited to
those prescribed in section 7of this practice. Refer
to the 4001C block diagram, section 5 of this prac-
tice, as an aid in following
this circuit description.
Note: The transmit and receive channels of the
4001C module are virtually identical. Therefore, the
description in paragraphs 4.02 and 4.03 applies to
both channels.
4.02 Atransformer is used at each port (input
and output)
of each channel to interface external
circuits. Switch-selectable taps on
the external-
circuit side of each transformer afford a choice of
1200, 600, or 150-ohm balanced terminating impe-
dance on both sides (facility and terminal) of the
module. The internal-circuit side
of each transfor-
mer is protected by asilicon voltage-transient sup-
pressor that limits transient voltages to asafe level
and provides
surge protection. In addition, both
transformers are center-tapped to derive balanced
simplex leads.
4.03 Signals
entering each channel's input port
are coupled across the input transformer and
applied
to the level adjust circuit and gain amp. The
level adjust circuit is controlled by the channel's
front-panel
gain/loss and level switches. These
switches allow selection of 0 to 24dB of gain or loss
in 0.1dB increments. Signals
at the output of the
gain amp are applied to an active slope-type
page 8

practice section 844001C
dimensions
5.58 inches (14.17cm) high
1.42 inches (3.61cm) wide
5.96 inches (15.14cm) deep
t
t
t
amplitude equalizer consisting of the equalization
adjust circuit and eql amp. The equalization adjust
circuit is controlled by the channel's front-panel eql
switches. These switches allow selection of 0 to
7.5dB of gain at 2804Hz (re 1004Hz) in 0.5dB
increments. Signals at the output of the eql amp are
applied to the power amp, which drives the output
transformer.
4.04
The 4001Ccan be optioned to provide
25mA of internally generated sealing current to
metallic facilities on the facility and/or terminal
sides
of the module, to accept externally generated
sealing current from the far ends of the facilities on
both sides of the module, to derive normal simplex
leads on both sides of the module, or to provide
bypassed (straight-through) simplex-lead
signaling
via apath separate from the transmit and receive
transmission paths. Each
of the 4001C's two inter-
nal sealing-current
sources has a"ZAP" feature by
which a greater amount of sealing current is pro-
vided
for a few seconds when power is initially
applied to the module.
4.05
When the internal sealing-current source on
the 4001C's facility side is selected, sealing current
is fed to the external 4wire facility through the
transmit output port (pins 41 and 47) and is
returned
to the module through the receive input
port (pins 7and 13). When the internal sealing-
current source on the 4001C's terminal side is
selected on
either side of the module, sealing
current is fed to the external 4wire facility through
the transmit input port (pins 49 and 55) and is
returned
to the module through the receive output
port (pins 5and 15). When the externally supplied
sealing current option is selected on either side of
the module, the center-tapped leads of the receive
and transmit transformers are
connected together.
This creates areturn path
that allows the module to
accept sealing current from an external source at
the distant end of the external facility. The third
option setting provides normal simplex-lead deriva-
tion at
the module's facility-side and/or terminal-
side ports.
When optioned for bypassed (Le.,
straight-through SX-Iead signaling, an additional
switch
option selects either normal (RCV IN SX to
RCV OUT SX and XMT IN SX to XMT OUT SX) or
reversed (RCV IN SX to XMT IN SX and RCV OUT
SX to XMT OUT SX) straight-through signaling.
4.06 The
4001C's facility-side (receive input and
transmit output) transformers are
connected to both
bridging and opening bantam-type test jacks, while
the terminal side (receive output and transmit input)
transformers are
connected to opening bantam-
type test jacks only.
4.07 The
power supply on the 4001C is a simple
series voltage regulator that uses a zener diode as
reference source. Aseries
diode in the negative
input battery lead protects the circuit against
reversed input-power connections, and ametal-
oxide varistor
between input battery and ground
limits high-level supply transients to asafe level.
6. specifications
Note: Transmit-channel and receive-channel speci-
fications of the 400 1C are identical.
terminating impedances (all four ports)
1200,600 or 150 ohms, balanced, switch-selectable
flat gain or loss
o to 24dB of gain or 0 to 24dB of loss, in switch-
selectable 0.1 dB increments, with gain or loss selec-
ted via switch option increments, prescription-set
deviation from gain or loss setting indicated
by front-panel switches
± 0.25dB maximum, re 1000Hz
maximum output level total harmonic distortion
+10dBm lessthan1%at+10dBm
output level
longitudinal balance (each port)
55dB minimum, 150 to 3000Hz
frequency response (unequalized)
± 0.5dB, 300 to 3000Hz, re 1000Hz
± 0.3dB, 500 to 3000Hz, re 1000Hz
amplitude equalization
active prescription slope-type providing from 0 to
7.5dB of gain at 2804Hz, re 1004Hz, in switch-
selectable 0.5dB increments
noise
15dBrnC maximum at maximum gain
delay distortion
less than 100,us, 300 to 3000Hz, re 1800Hz
(measured worst-case with equalization)
crosstalk loss between channels
85dB minimum at 1000Hz
75dB minimum at 3000Hz
crosstalk loss between units in adjacent, above, or below
shelf slots
90dB minimum at 1000Hz
85dB minimum at 3000Hz
simplex (SX) current
120mA maximum, with 5mA maximum unbalance
internal sealing-current sources
(facility and terminal sides)
25mA, balanced (with higher ZAP current for a few
seconds upon initial application of power to module)
input power requirements when neither sealing-current
source is used
voltage: -22 to -56Vdc filtered, ground referenced
current (at -48Vdc): 75mA maximum, 30mA at idle
input power requirements when internal sealing-current
sources are used
voltage: -42 to -56 Vdc filtered, ground referenced
current (at -48Vdc): 57mA at idle, 92mA maximum
with one sealing-current source active; 84mA at
idle, 132mA maximum with both sealing-current
sources active
operating environment
20' to 130°F (-7 to
54'C), humidity to 95%
(no condensation)
weight
13 ounces (369 grams)
mounting
relay rack or apparatus case via one position of a
Tellabs Type 10 Mounting Shelf or one position of a
Tellabs 246 Resistive Data Bridge Mounting Assembly
page 9

~
., •
844001C
55 J'
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4001C Prescription Line Amplifier
'3'~
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POWER
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::: S;~1 "ss"r
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5. block diagram

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7. testing and troubleshooting
7.01 The testing guide checklist in this section
may be used to assist in the installation, testing, or
troubleshooting of the 4001CPrescription Line
Amplifier. The checklist is intended as an aid in the
localization of trouble to a specific module. If a
module is
suspected of being defective, a new one
should be substituted and the test conducted
again. If the substitute module operates correctly,
the original
module should be considered defective
and returned to Tellabs for repair or replacement
as directed below. We strongly recommend that no
internal (component-level) testing or repairs be
attempted on the module. Unauthorized testing or
repairs may void the module's warranty. Also, if the
module is part of aregistered system, unauthorized
repairs will result in noncompliance with Part 68 of
the FCC Rules and Regulations.
Note: Warranty service does not include removal
of permanent customer markings on the front panels
of Tellabs modules, although an attempt will be
made to do so. If a module must be marked defec-
tive, we recommend that it be done on a piece of
tape or on aremovable stick-on label.
7.02 If asituation arises that is not covered in
the checklist, contact Tellabs Customer Service as
follows
(telephone numbers are given below):
USA customers:
Contact Tellabs Customer Service
at your Tellabs Regional Office.
Canadian customers:
Contact Tellabs Customer
Service at our Canadian headquarters in
Mississauga, Ontario.
International customers:
Contact your Tellabs
distributor.
US Atlantic Region: (203)
798-0506
US Capital Region: [phone]
US Central Region: [phone]
US Southeast Region: [phone]
US
Southwest Region: [phone]
US Western Region: [phone]
Canada: [phone]
page 11
practice section 844001C
7.03 If a module is diagnosed as defective,
follow the replacement procedure in paragraph
7.04
when acritical service outage exists (e.g.,
when a system or acritical circuit is down and no
spares are available). If
the situation is not critical,
follow the repair and return procedure in paragraph
7.05.
replacement
7.04 To obtain a replacement module, notify
Tellabs via letter or telephone (see addresses and
numbers below) or via TWX (910-695-3530 in the
USA,
610-492-4387 in Canada). Be sure to provide
all relevant information,
including the 8X4001C
part number that indicates the issue of the module
in question. Upon notification, we shall ship a
replacement module to you. If the module in ques-
tion is in warranty, the replacement will be shipped
at no charge. Pack the defective module in the
replacement module's carton, sign the packing slip
included with the replacement, and enclose it with
the defective module (this is your return authoriza-
tion). Affix
the preaddressed label provided with the
replacement module to the carton being returned,
and ship the module prepaid to Tellabs.
repair and return
7.05 Return
the defective module, shipment pre-
paid,
to Tellabs (attn: repair and return).
in
the USA:
Tellabs, Inc.
4951
Indiana Avenue
Lisle, Illinois 60532
telephone [phone]
in Canada:
Tellabs
Communications Canada, Ltd.
1200 Aerowood Drive, Unit 39
Mississauga, Ontario, Canada L4W 2S7
telephone [phone]
Enclose an explanation of the module's malfunc-
tion.
Follow your company's standard procedure
with regard to administrative paperwork Tellabs
will
repair the module and ship it back to you. If the
module is in warranty, no invoice will be issued.
checklist on next page

practice section 844001C
test test procedure
testing guide checklist
normal result if
normal conditions
are not met, verify: •
receive
level
receive
equalization
transmit
level
transmit
equalization
sealing
current,
facility
sealing
current,
terminal
Arrange transmit portion of trans-
mission measuring set (TMS) for
1004Hz tone output at -20dBm if
module's rev channel is optioned
for gain or at OdBm if module's rev
channel is optioned for loss. Also
set transmit portion of TMS for
facility-side interface impe-
dance selected on module. Con-
nect 1004Hz signal to rev in jack.
Arrange receive portion of TMS for
terminated measurement at ter-
minal-side inter-face impedance
selected on module, and connect
it to rev out jack.
Maintain connections as above.
Adjustrev
eql switches for no equal-
ization (all switches set to out).
Adjust module's receive output
level forOdBm at 1004Hz. Change
input frequency to 2804Hz and
add equalization (up to maximum)
by setting rev eql switches to in
one by one.
Arrange transmit portion of TMS
for 1004 Hz tone output at -20
dBm if module's xmt channel is op-
tioned for gain or at OdBm if mod-
ule's
xmt channel is op-tioned for
loss. Also set transmit portion of
TMS for terminal-side interface
impedance selected on module.
Connect 1004Hz signal to xmt in
jack. Arrange receive portion of
TMS for terminated measurement
at facility-side interface impe-
dance selected on module, and
connect it to xmt out jack.
Maintain connections as above.
Adjust xmt eql switches for no
equalization (all switches set to
out). Adjust module's transmit out-
put level for OdBm at 1004Hz.
Change input frequency to 2804Hz
and add equalization (up to max-
imum)
by setting xmt eql switches
to in one by one.
Option module for internally sup-
plied sealing current on facility
side by setting switch 56 to
50URCE. Using bantam-type
plugs inserted intoxmt out and rev
in jacks,
connect VOM set for mA
measurement across facility-side
xmt and rcv tip leads (pins 7 and
41), with positive VOM lead on xmt
out tip (pin 7).
Option module for internally sup-
plied sealing current on terminal
side by setting switch S7 to
source. Using bantam-type plugs
inserted into xmt in and rev out
jacks, connect VOM set for mAmea-
surement across terminal-side
xmt and rcv tip leads (pins 5 and
55), with positive VOM lead on xmt
in tip (pin 55).
Signal level indicated on TMS cor-
responds to receive gain or loss
setting on module D.
Receive output level at 2804Hz
increases to +7.5dBm as equal-
ization is added D.
Signal level indicated on TMS cor-
responds to transmit gain or loss
setting on module D.
Transmit
output level at 2804Hz
increases to +7.5dBm as equal-
ization is added D.
VOM reads approximately 25mA
D. Front-panel seal eurr 1 LED
lights D.
VOM reads approximately 25mA
D. Front-panel seal curr 2 LED
lights D.
page 12
Power [J. Wiring D. Proper impe-
dance terminations (check for
double terminations) D. Impe-
dance switches (51 and 53) pro-
perly set D. Level switches (rev
gain/loss and rev level) properly
set D. Replace module and re-
test D.
Input level at 2804Hz same as at
1004Hz D. Terminating impe-
dance correct D.
Power D. Wiring D. Proper impe-
dance terminations (check for
double terminations) D. Impe-
dance switches (51 and 53) pro-
perly set D. Level switches (xmt
gain/loss and xmt level) properly
set D. Replace module and re-
test D.
Input level at 2804Hz same as at
1004Hz D. Terminating impe-
dance correct D.
Input battery at least -42Vdc D.
Replace module and retest D.
Input battery at least -42Vdc D.
Replace module and retest D.
•
•