Tellabs 6008C User manual

6008C DX-to-E&M Signaling Converter
Subassembly
•-rtellabs
technical manual
76-816008C
rev B 08/87
Please Note: The 6008C subassembly can be
optionally installed (by the customer or the fac-
tory) on
the Tellabs 6132 2Wire-to-4Wire or 4Wire-
to-4Wire Terminal Interface Module as well as on
the 6131 module. When installed on a6132, the
6008C and its host module are referred to, and
can be ordered as, the 6132C.
practice section 816008C
©Tellabs, Inc., 2 November 1985
all rights reserved, printed in USA
1. general description
1.01 The 6008C OX-to-E&M Signaling Converter
plug-on subassembly (figure 1) provides bidirec-
tional conversion
between OX (duplex) signaling,
which is
extended-range E&M signaling over OX
signaling leads (see note), and the type of E&M
signaling used
by a carrier channel (or aPBX). An
electronic OX signaling unit, the 6008C operates
end-to-end either with conventional relay-type OX
signaling units or with electronic OX units. The
6008C is designed for optional use on the Tellabs
6131
2Wire-to-4Wire or 4Wire-to-4Wire Terminal
Interface Module.
Note: In 2wire applications, the leads used for OX
signaling are A and Bleads. In 4wire applications,
the leads used
for OX signaling are simplex (SX)
leads.
1.02 This
practice section is revised to update the
text portion of section 7.
1.03 Functions, features, and options of the
6008C include the following:
•
Switch-selectable OX1 or OX2 signaling.
•Switch-selectable Type
I, II, or III E&M interface.
•Integral
OX balance network that provides from 0
to 6750 ohms of switch-selectable resistance
and from 0
to 7J.-tF of switch-selectable
capacitance.
•Switch-selectable 0
or 4fLF midpoint capacitance
for the OX signaling leads.
•Maximum signaling
and supervisory range of
5000 ohms for the external OX loop.
1.04 The 6131
module on which the 6008C is
used provides transmission
interface between a
2wire or 4wire facility and a 4wire E&M trunk. Along
with switch-selectable
2wire or 4wire facility-side
interface,
transformer coupling is provided at all
ports of the 6131, and prescription bidirectional
level control (loss only in FCC-registered applica-
tions, gain
or loss in non-registered applications) is
also available on
the module. Thus, in the 2wire-to-
4wire mode, the 6131 functions as ahybrid ter-
minating
set with pads (registered) or as a 2wire-to-
4wire repeater (non-registered). In the 4wire-to-
4wire mode, the 6131 functions as a pad/trans-
former module (registered) or as a 4wire-to-4wire
•
•
contents
section 1general description
section 2application
section 3installation
section 4
circuit description
section 5
block diagram
section 6
specifications
section 7testing and troubleshooting
page 1
page 2
page 3
page 6
page 7
page 6
page 8
page 1
figure
1. 6008C DX-to-E&M Signaling Converter
subassembly
repeater (non-registered). When the 6008C is
installed on
the 6131, the resulting module-sub-
assembly combination is referred to as a6131C.
The 6008C subassembly makes physical and elec-
trical
connection to its host 6131 via two 15-pin
male
connectors on the 6008C and corresponding
female
connectors on the printed board of the 6131.
Note: While the 6008C subassembly and the 6131
module can be ordered separately, the 6131 can
also be
ordered with the 6008C factory-installed on
the module.
To do this, simply specify the 6131C
module on the order.
1.05 With
the 6008C subassembly installed, the
host 6131 can be switch-optioned for either of three
facility-side signaling-lead arrangements:
•Bypass: In the bypass mode, the 6008C sub-
assembly is electrically bypassed so that no
signaling conversion takes place.
• Normal: In the normal mode with 2wire facility
interface selected, the 6131's Alead is associ-
ated with
the 2wire tip lead, and the Blead is
associated with
the 2wire ring lead. In the normal
mode with 4wire facility interface selected, the
6131's receive output SX lead is associated with
the 4wire receive output pair, and the transmit
input SX lead is associated with the 4wire
transmit input pair.
•Reverse: In the reverse mode with 2wire facility
interface selected, the 6131's Alead is associ-
ated with
the 2wire ring lead, and the Blead is
associated
with the 2wire tip lead. In the reverse

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BOOBC ,I PBX trunk circuit
figure 2b. DX2 signaling, TL31E or TC31E
-4BV
the 600BC in these two signaling modes is as
follows:
•
In OX1 operation, the 600BC accepts local
(terminal-side) M-Iead inputs and derives
the
appropriate OX current for transmission to the
distant (facility-side) location. Also in OX1 opera-
tion,
the 600BC derives local E-Iead output states
in response
to OX current received from the dis-
tant location.
•
In OX2 operation, the 600BC accepts local E-Iead
inputs and derives the appropriate OX current for
transmission to the distant location. Also in OX2
operation, the
600BC derives local M-Iead output
states in response to OX current received from
the distant location.
OX signaling loop limits
2.03 For proper OX signaling operation, total
resistance of
the OX signaling loop between the
600BC and the OX unit at the distant facility-side
location must
not exceed 5000 ohms. In 2wire
applications, total
OX signaling-loop resistance is
simply
the resistance of the metallic loop between
the two OX signaling units. In 4wire applications,
where signaling
takes place over the SX leads of
the
transmit input and receive output pairs, total OX
signaling loop resistance equals one half of the
loop resistance
of the transmit input pair plus one
half of
the loop resistance of the receive output pair.
E&M interface
2.04 With either OX1 or OX2 operation selected,
the 600BC can be switch-optioned for Type I or
Type II E&M interface. In OX1 operation only, the
600BC is compatible with aType III E&M interface
when
optioned for Type I. Figures 2through 4 show
the various E&M interfaces available with OX1 and
OX2 operation. Registered Facility Interface Codes
are also provided
where applicable (i.e., for all inter-
faces exceptType III with OX1).
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,,
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! n~:;~L£'~n ~ ,>--<'
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,,
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BOOBC : : PBX trunk cirCUit
figure 2a. DX1 signaling, TL31M or TC31M
1
figure 2. Type IE&M interface arrangements
practice section B1600BC
mode with
4wire facility interface selected, the
6131's receive output SX lead is associated with
the
4wire transmit input pair, and the transmit
input SX lead is associated with
the 4wire
receive output pair.
1.06
Input power is supplied to the 600BC sub-
assembly via
the host 6131 module. Integral voltage
regulators on the
600BC and the 6131 allow the
6131C
to operate on filtered, ground-referenced
-42 to -56Vdc input. Maximum current required by
the
600BC and its host 6131 together is 110mA
plus
OX sending current.
1.07 As
stated above, the 600BC plugs onto the
printed circuit board
of its host 6131, aType 10
module. The resulting 6131C, in turn, plugs into
one
position of aTellabs Type 10 Mounting Shelf, ver-
sions of
which are available for relay-rack and
apparatus-case installation. In relay-rack applica-
tions,
up to 12 modules can be mounted across a
19-inch rack,
while up to 14 modules can be moun-
ted across a
23-inch rack. In either case, 6 inches of
vertical rack space is used.
page 2
2. application
2.01 The 600BC OX-to-E&M Signaling Converter
subassembly, when installed on its host 6131
2Wire/4Wire-to-4Wire Terminal Interface Module,
interfaces a
2wire or 4wire facility that uses OX
signaling with a 4wire E&M trunk that normally
interfaces a carrier channel. When the host 6131
module is
optioned for 2wire facility interface,
signaling is derived via
the module's Aand 8leads.
When the 6131 is
optioned for 4wire facility inter-
face, signaling is derived via the module's receive
output SX and transmit input SX leads.
OX1 /OX2 signaling
2.02 The 600BC can be switch-optioned for a
OX1 or OX2 signaling arrangement. Operation of

practice section 816008C
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M !ETECTOR -=
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,
r PBX trunk circuit
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BOOBC
-48V-48V
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figure 3a. DX1 signaling, TL32M or TC32M figure 3b. DX2 signaling, TL32E or TC32E
figure 3. Type
1/ E&M interface arrangements
figure 4. DX1 signaling, Type 1/1 E&M interface
arrangement
2.07 The amount of resistance required in the
balance network is simply the total resistance of the
external OX signaling link. This is because a1210-
ohm resistive
component integral to the 6008C's
balance network automatically compensates for the
resistance of the OX unit associated with the ter-
minal
equipment at the opposite end of the OX
signaling link. The five KILOHMS positions of the
6008C's OX-balance-network DIP switch introduce
from 0 to 6750 ohms of resistance, in 250-ohm
increments, to permit matching (within 125 ohms) of
OX-link resistance up to 5000 ohms.
2.08
No specific formula exists for calculating the
amount of capacitance required to properly balance
the circuit. This amount depends upon a variety of
factors. For example, little capacitive balance is
required in
most 4wire OX circuits because the
signaling pairs are separated by substantial relative
distances and are therefore coupled by very little
mutual capacitance. Numerous other factors,
including cable gauge and splicing format, also
affect the OX signaling link. The cumulative effect of
these factors makes prediction of the required
amount of balancing capacitance difficult. Atrial-
and-error procedure is therefore necessary to
achieve proper capacitive balance. The three [LF
positions of the 6008C's OX-balance-network DIP
switch allow from 0 to 7 [LF of capacitance to be
introduced into the circuit in 1[LF increments.
3. installation
inspection
3.01 The 6008C OX-to-E&M Signaling Converter
subassembly should be visually inspected upon
arrival
to find possible damage incurred during ship-
ment. If
damage is noted, aclaim should immedi-
ately be filed with the carrier. If stored, the
subassembly should be visually inspected again
prior to installation.
page 3
-4BV
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>--<, MM
>--<; SB
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,
,
,
,PBX trunk circuit
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BOOBC :
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signaling-lead midpoint capacitance
2.05 To prevent unwanted signaling-state
changes toward the facility-side termination, a
switch option on
the 6008C allows 4[LF of capaci-
tance to be placed across the midpoint of the
6008C's OX signaling leads. This midpoint capaci-
tance must be provided in all 2wire applications.
Normally, it is also provided in all
4wire applications
except those involving an unusually short OX
signaling link. In short-link applications, the mid-
point
capacitor is switch-optioned out of the circuit
for O[LF of midpoint capacitance, which allows
easier
alignment of the 6008C's integral OX
balance network than would otherwise be possible
with a
short OX link.
OX balancing
2.06 Aresistive and capacitive OX balance net-
work in the 6008C is used to balance the module's
internal OX impedance against that of the external
OX signaling link. Proper OX balance ensures
optimum performance of the 6008C's OX unit for
the specific length (in ohms) of the OX signaling link
and also minimizes pulse distortion.
~
-

figure 5. 6008C option and alignment switch locations
section of the 6008C's integral OX balance network
may not be possible. Paragraphs 3.10 and 3.11 pro-
vide
appropriate non-prescription alignment pro-
cedures for the resistive and capacitive sections of
the OX balance network.
non-prescription optioning
3.05 If prescription option-switch settings are not
available for the 6008C, set its three option
switches as directed below.
Note: If the Registered Facility Interface Code is
known for a particular application, the 6008C's two
signaling-related option switches (S10 and S13) can
be set as indicated in table 2.
3.06 DX1 or DX2 Operation. Two-position slide
switch 813 selects either DX1 or DX2 operation for
the 6008C. Set 813 as follows:
•For
DX1 operation (receiving M-lead signals from
and
sending E-Iead signals toward E&M terminal
equipment),
set 813 to OX1.
•For DX2 operation (receiving E-lead signals from
and sending M-Iead signals toward E&M terminal
equipment),
set 813 to OX2.
3.07 E&M Signaling Interface. Two-position
slide switch
810 selects Type I, II, or III E&M inter-
face
for the 6008C. Set 810 as follows:
•
To 1/1/1 for Type IE&M interface.
•
To /I for Type II E&M interface.
•
To 1/1/1 for Type III E&M interface (available only
when 813 is set to DX1).
3.08 Signaling-Lead Midpoint Capacitance.
The MPC position of nine-position DIP switch 815
(the
rightmost switch position) allows either 4,uF or
O,uF of midpoint capacitance to be placed across the
6008C's DX signaling leads. Set the MPC switch as
follows:
•
In all 2wire applications, and in all 4wire appli-
cations except those involving an unusually
short DX signaling link, set the MPC switch to IN
to provide 4,uF of midpoint capacitance.
[ E LED
[ M LED
81-6008C
513
o~L
P1
[
P2
[
510
~
1I111
practice section 816008C
mounting and connections
3.02 The 6008C subassembly makes physical
and electrical
connection to its host 6131 module
via two 15-pin male connectors, P1 and P2, located
on the subassembly's
component side. To install the
6008C on the host 6131, proceed as follows:
A. Remove the small plastic filler panel at the
upper righthand corner of the 6131's front panel
by pushing it
outward from the rear of the panel.
B. Orient the 6008C subassembly so that male
connector P1 on the 6008C lines up with
female
connector J1 on the 6131, male connec-
tor P2 on the 6008C lines up with female con-
nector J2 on the 6131, and the small plastic
panel labeled Cand
containing the E and M
LED's on
the 6008C lines up with the opening
at the upper righthand corner of the 6131's front
panel adjacent to the 6131 model number.
C. Carefully plug the 6008C onto the host 6131,
ensuring that all
connector pins on the 6008C
fit properly into their receptacles on the 6131's
female
connectors and also ensuring that the
small plastic panel labeled Con the 6008C fits
properly
into the opening in the 6131's front
panel.
D. Finally, install and tighten the screws (supplied)
that
secure the 6008C's four standoff posts to
the 6131's printed circuit board.
options and alignment
3.03 Before the 6008C is placed into service,
three option
switches on the subassembly must be
set and the subassembly's integral DX balance net-
work (also switch-controlled) must be aligned. Two
of
the option switches are two-position slide
switches,
while the third is one position of anine-
position DlPswitch. The remaining
eight positions
of the DIP switch control the DX balance network.
Figure 5
shows the locations of these switches on
the subassembly's printed circuit board. In addition
to the 6008C's SWitches, several option and align-
ment switches on the host 6131 must be set as
well.
Instructions for setting the 6131's switches are
provided in
the Tellabs 6131 practice, while instruc-
tions for setting the 6008C's switches are provided
below.
prescription optioning and alignment
3.04 For prescription optioning and alignment of
the 6008C (see notes below), required switch set-
tings should be
determined from circuit records
prior
to installation of the 6131 C. These required
settings should then be noted in the checklist
column of table 1 or on the circuit layout record
(CLR). During installation, the
6008C can be quickly
and easily optioned without referring to the detailed
instructions in the text. Simply refer to the check-
list column of table 1(or to the CLR) and set all
switches as indicated.
Note 1: A similar table and checklist are proVided in
the Tel/abs 6131 practice for prescription optioning
and alignment of the host 6131 module.
Note 2: For reasons stated in paragraph 2.08 of this
practice, prescription alignment of the capacitive
page 4

table 2. Registered Facility Interface Codes and required signaling options
table 1. Summary and checklist of 6008e option and alignment switches
practice section 816008C
Total resistance added is the sum of those
KILOHMS switches set toward their respective
values, i.e., toward .25, .5, 1, 2, and 3 and away from
KILOHMS. Please note that a 1210-ohm resistive
component integral to the resistive section auto-
matically compensates for the internal resistance of
the OX unit at the terminal-equipment end of the OX
link. Thus, the required balance-network resistance
is simply the total resistance of the OX signaling
link. Determine this resistance and set the balance-
network KILOHMS switches as follows:
• For 2wire applications, the required balance-
network resistance equals the resistance of the
2wire metallic loop between the 6008C and the
terminal-end DX unit. Set toward their respective
values those KILOHMS switches whose sum
matches this amount as closely as possible.
page 5
Registered Facility E&M signaling OX signaling 6008C option
Interface Code interface arrangement switch settings*
510 513
TL31 M or TC31 M
Type I
OX1
1/111 OX1
TL31 E or TC31 E
Type I OX2 1/111 OX2
TL32M or TC32M Type II
OX1
II
OX1
TL32E orTC32E
Type II OX2 II
OX2
not applicable Type III
OX1
1/111
OX1
* See table 1and/or text for information on non-signaling-related 6008C options.
switch option
switch
selection
setting
checklist
OX1 * or OX2**
S13
OX1 operation*
OX1
operation OX2 operation **
OX2
Type I, II, or III S10
Type Iinterface
1/111
E&M interface
Type II interface
II
Type III interface 1/111
(available only with S13
set to DX1)
signaling-lead
S15,
4,uF
IN
midpoint capacitance (4,uF)
MPC position OftF
OUT
OX balance network
S15 (BAL), 250
ohms toward .25
resistance
KILOHMS
500 ohms toward .5
(0 to 6750 ohms)*** positions 1000
ohms toward 1
only*** 2000
ohms
toward 2
3000 ohms toward 3
OX balance network
S15 (BAL), 1,uF
toward 1
capacitance ftF positions
2,uF toward 2
(0 to 7,uF)*** only***
4,uF
toward 4
*
In OX1 operation, the 6008C accepts M-Iead inputs for OX transmission to the remote site and derives E-Iead outputs
from OX signals received from the remote site.
** In OX2 operation, the 6008C accepts E-Iead inputs for OX transmission to the remote site and derives M-Iead outputs
from OX signals received from the remote site.
***
The OX balance network's resistance and capacitance switch positions on OIP switch S15 are cumulative. Total resis-
tance and capacitance introduced is the sum of those KILOHMS and ,uF switch positions set toward their respective
I
values.
•In 4wire applications where the OX signaling link
is unusually short, set the MPC switch to OUT for
no midpoint capacitance.
OX balance network alignment
3.09 The 6008C's integral resistive and capaci-
tive OX balance network allows the subassembly's
internal OX impedance to be balanced against that
of the external OX signaling loop. Align the resistive
and capacitive sections of the balance network as
directed below.
3.10
Resistive Section. The five KILOHMS
switches on nine-position DIP switch S15 control
the resistive section of the balance network. These
switches introduce from 0 to 6750 ohms of resis-
tance, in 250-ohm increments, to match (within 125
ohms) external loop resistance of up to 5000 ohms.
-
~