Dantel 44118 User manual

CAUTION
Install or remove modules from the shelf only when the power is off.
If you install a module in the shelf with the power on, the internal
circuitry may suffer damage and the product warranty will be void.
Remove and install circuit boards only in a static-safe environment
(use antistatic wrist straps, smocks, footwear, etc.).
Keep circuit boards in their antistatic bags when they are not in use.
Do not ship or store circuit boards near strong electrostatic, electromag-
netic, magnetic, or radioactive fields.
For more complete information on electrostatic discharge safety
precautions, refer to BellcoreTM Technical Reference #TR-NWT-000870.
Copyright 1998 by Dantel, Inc. • Dantel is a registered trademark of Dantel, Inc. • ISO 9001 Registered
Printed in the U.S.A.
INSTALLATION&OPERATION MANUAL
44118-0798<90-00003>
44118 ACTIVE
DISTRIBUTION
BRIDGE
About this Practice:
This practice has been reissued to:
• Update Table E.
Issue date: July 1998
Reissued Practices: Updated and
new content can be identified by a
banner in the right margin.
UPDATED
Table of Contents
Ordering Information ........................................................................... 2
General Description.............................................................................. 2
Circuit Description ............................................................................... 2
Installation............................................................................................ 6
Technical Specifications ..................................................................... 21
Warranty ............................................................................................. 22

PAGE 2 44118-0798<90-00003>
ORDERING INFORMATION
NOTE: This section lists the different options available for this product. To order any of the avail-
able options, contact Dantel Inside Sales through our toll-free number, 1-800-432-6835.
OPTION NUMBER FEATURES
A11-44118-00 Active Distribution Bridge
GENERAL DESCRIPTION
The 44118 Active Distribution Bridge (44118 ADB) is a plug- in printed circuit module that fits into any 400-type or
similar equipment housing.
The 44118 ADB can be used as:
♦A four-way/four-wire bridge
♦An eight-way/four wire bridge using two modules
♦A general purpose summing and distribution amplifier
The front panel includes test jacks and level controls for each
port, allowing complete alignment of the bridge.
A combined distribution output port provides alignment and
operation of a common DTMF decoder or monitor speaker.
The 44118 ADB operates on -21 to -56 VDC input power.
CIRCUIT DESCRIPTION
Fig. 1 shows the functional schematic for the 44118 Active
Distribution Bridge. The circuit consists of:
♦Four line receive circuits
♦Four transmit distribution networks
♦Four line transmit circuits
♦Four receive distribution networks
♦A summing bus
♦A combined distribution circuit
♦A power regulator
Here is a brief description of each of the functional parts of the
circuit:
Line Receive Circuits
Each of the four line receive circuits contains:
♦A test jack
CONTINUED . . .

44118-0798<90-00003> PAGE 3
♦An input transformer
♦An integrated circuit operational amplifier
The input signal at the PC connector pins routes to the normal-
through contacts of the LINE RCV jack, then to the primary side
of the transformer. The secondary side of the transformer has
transient-protection diodes and a 600-ohm terminating resistor.
The transformer drives the amplifier.
The amplifier has variable gain and a gain-range strap. The
gain-range strap matches the input to the desired amplifier
output level. The HI position is for input levels of 0 to -16 dBm.
The LO position is for input levels of +7 to 0 dBm.
Each line receive circuit output couples to the combined distri-
bution circuit through a resistive network. Each line receive
circuit output can be strapped to drive the summing bus and/or
the respective transmit distribution network.
Transmit Distribution Networks
Each of the four transmit distribution networks provides one
direct bus (low impedance) output and three resistively isolated
(100K ohm) outputs. The outputs distribute signals to external
summing points; that is, eight-way bridges and general signal
distribution.
A strapping network can disconnect the transmit distribution
network if you use four-way bridges.
Line Transmit Circuits
Each of the four line transmit circuits contains:
♦An amplifier
♦An output transformer
♦A test jack
The summing bus (in four-way and eight-way bridge applica-
tions) and/or the receive distribution network (in eight-way
bridge and general summing applications) provides the input
signal to the amplifier. Strapping networks allow individual
selection of these input sources.
Use the gain strap LO position for output levels between
-16 dBm and 0 dBm. Use the HI position for input levels below
0 dBm or output levels up to +7 dBm.
The amplifier output couples to the transformer primary
through a 600-ohm resistor. The primary provides transient-
protection diodes. The secondary side of the transformer routes
the signal to the normal-through contacts of the LINE XMT jack
and the output PC connector pins.
CONTINUED . . .
CIRCUIT DESCRIPTION

PAGE 4 44118-0798<90-00003>
LINE
RECEIVE
INPUT 1
45
48.7K
1 RCV
GAIN
HI LO
-10V
T1
J1
47
600
LINE RECEIVE CIRCUIT 1
27
1 XMT
GAIN
LO HI
T2
J2
33
600
LINE TRANSMIT CIRCUIT 1
LINE
TRANSMIT
OUTPUT 1
COMBINED
DISTRIBUTION
OUTPUT
T9
J9
COMBINED DISTRIBUTION CIRCUIT
1
37
100K
100K
100K
D1X
D1H
G1X B1X
G2X B2X
100K
100K
100K
48
46
44
42
TRANSMIT DISTRIBUTION NETWORK 1
H1R
D1R 100K
100K
100K
8
6
4
2
RECEIVE DISTRIBUTION NETWORK 1
100K
10
TRANSMIT
DISTRIBUTION
1C
1B
1A
1
1C
1B
1A
1
1D
RECEIVE
DISTRIBUTION
LINE
RECEIVE
INPUT 2
41
48.7K
2 RCV
GAIN
HI LO
-10V
T3
J3
43
600
LINE RECEIVE CIRCUIT 2
11
2 XMT
GAIN
LO HI
T4
J4
29
600
LINE TRANSMIT CIRCUIT 2
LINE
TRANSMIT
OUTPUT 2
100K
100K
100K
D2X
D2H 100K
100K
100K
56
54
52
50
TRANSMIT DISTRIBUTION NETWORK 2
H2R
D2R 100K
100K
100K
18
16
14
12
RECEIVE DISTRIBUTION NETWORK 2
100K
20
TRANSMIT
DISTRIBUTION
2C
2B
2A
2
2C
2B
2A
2
2D
RECEIVE
DISTRIBUTION
LINE
RECEIVE
INPUT 3
7
48.7K
3 RCV
GAIN
HI LO
-10V
T5
J5
9
600
LINE RECEIVE CIRCUIT 3
15
3 XMT
GAIN
LO HI
T6
J6
25
600
LINE TRANSMIT CIRCUIT 3
LINE
TRANSMIT
OUTPUT 3
100K
100K
100K
D3X
D3H 100K
100K
100K
23
21
19
39
TRANSMIT DISTRIBUTION NETWORK 3
H3R
D3R 100K
100K
100K
28
26
24
22
RECEIVE DISTRIBUTION NETWORK 3
100K
30
TRANSMIT
DISTRIBUTION
3C
3B
3A
3
3C
3B
3A
3
3D
RECEIVE
DISTRIBUTION
LINE
RECEIVE
INPUT 4
3
48.7K
4 RCV
GAIN
HI LO
-10V
T7
J7
5
600
LINE RECEIVE CIRCUIT 4
13
4 XMT
GAIN
LO HI
T8
J8
31
600
LINE TRANSMIT CIRCUIT 4
LINE
TRANSMIT
OUTPUT 4
100K
100K
100K
D4X
D4H 100K
100K
100K
55
53
51
49
TRANSMIT DISTRIBUTION NETWORK 4
H4R
D4R 100K
100K
100K
38
36
34
32
RECEIVE DISTRIBUTION NETWORK 4
100K
40
TRANSMIT
DISTRIBUTION
4C
4B
4A
4
4C
4B
4A
4
4D
RECEIVE
DISTRIBUTION
G3X B3X
G4X B4X
SUMMING BUS
FIG. 1 - FUNCTIONAL SCHEMATIC, 44118
CIRCUIT DESCRIPTION

44118-0798<90-00003> PAGE 5
Receive Distribution Networks
Each of the four receive distribution networks provides one
direct bus input and four resistively isolated (100K ohm) inputs.
These inputs sum signals from external distribution points; that
is, eight-way bridges and general signal distribution applica-
tions.
Several signals can be summed at the direct bus input. Only one
signal source should connect to each resistively isolated input. A
strapping network can disconnect the receive distribution
network if you use four-way bridges.
CAUTION: Rx bus radio levels should not exceed 0 dBm. Levels above
0 dBm can result in distorted signals. Check the RX bus signal
level at the combined distribution output.
Summing Bus
The summing bus is a resistive network that distributes signals
from each line receive circuit to each line transmit circuit. The
line transmit circuit excludes its mating transmit port input.
This forms an on-board, four-way bridge.
You can strap each input circuit to the summing bus in general
signal distribution applications. Inputs not strapped to the
summing bus has its respective summing line strapped to
ground. This prevents noise and cross talk from injection at the
line transmit circuits. You can also use the summing bus in
eight-way bridge applications.
Combined Distribution Circuit
The combined distribution circuit contains:
♦Summing resistors
♦A fixed-gain amplifier
♦An output transformer
♦A test jack
Each line receive circuit signal sums at the amplifier input. The
unity-gain amplifier buffers the signal and feeds it to the trans-
former primary through a 600-ohm resistor.
The transformer secondary passes the signal to the normal-
through contacts of the test jack. The signal feeds to the output
PC connector at pins 1 and 37. The test jack sets the line receive
circuit gains. You can wire the output pins to a DTMF decoder
for common decoding of all four input legs.
Power Regulator
The power regulator provides -10 and -20 VDC output power for
the 44118 ADB.
CIRCUIT DESCRIPTION

PAGE 6 44118-0798<90-00003>
INSTALLATION
I
nstallation consists of wiring the connector and installing the
proper strap settings based on the application use. Applica-
tions include:
♦Four-Way/Four-Wire Bridge
♦Eight-Way/Four-Wire Bridge
♦Summing and Distribution Amplifier
This section also includes calibration procedures for each of the
applications.
1. Wire the connector
Normally, the shelf is pre-wired for the module. If you wire the
connector, refer to Fig. 2 for the edge connector pin designations.
2. Install the Proper Strap Options
Determine the desired strapping application:
♦Four-Way/Four-Wire Bridge
♦Eight-Way/Four-Wire Bridge
♦Summing and Distribution Amplifier
The following sections describe each application.
NOTE: If the 44118 is shipped in a shelf, it is strapped according to the
shelf application. If the 44118 is not shipped in a shelf, it is
strapped for Four-Way/Four-Wire.

44118-0798<90-00003> PAGE 7
INSTALLATION
FIG. 2 - PIN DESIGNATIONS, 44118 BRIDGE
56 55
54 53
52 51
50 49
48 47
46 45
44 43
42 41
40 39
38 37
36 35
34 33
32 31
30 29
28 27
26 25
24 23
22 21
20 19
18 17
16 15
14 13
12 11
10 9
87
65
43
21
CIRCUIT SIDE
OF PC BOARD
COMPONENT SIDE
OF PC BOARD
4C
2C
4B2B
4A2A
42
(R)1C
(T)1B
(R)1A
(T)1
XMT DIST Output 34D
Combined Distribution Output (R)4C
-21 to -56 VDC input4B
Port 1 OUT (R)4A
Port 4 OUT (R)4
Port 2 OUT (R)3D
Port 1 OUT (T)3C
Port 3 OUT (R)3B
3C3A
3B3
3A2D
Ground (REF)2C
Port 3 OUT (T)2B
Port 4 OUT (T)2A
Port 2 OUT (T)2
(R)1D
(T)1C
(R)1B
(T)1A
Combined Distribution Output (T)1
XMT DIST 4
Outputs
Port 1 IN
Port 2 IN
XMT DIST 3
Outputs
Port 3 IN
Port 4 IN
XMT DIST 2
Outputs
XMT DIST 1
Outputs
RCV DIST 4
Inputs
RCV DIST 3
Inputs
RCV DIST 2
Inputs
RCV DIST 1
Inputs

PAGE 8 44118-0798<90-00003>
FOUR-WAY/FOUR-WIRE BRIDGE APPLICATION
Fig. 3 shows a 44118 Active Distribution Bridge four-way/
four-wire bridge application. A signal received at port 1 appears
at output ports 2, 3 and 4, but not at output port 1.
Dividing the input signal three ways and providing the
necessary isolation between the ports reduces the input
signal amplitude. Set the proper signal level by adjust-
ing the gain on the input and output of each port. The
illustration is typical for all four ports.
You can connect a 44020 DTMF decoder to the com-
bined distribution output (pins 1 and 37). The 44020
DTMF decodes DTMF dialing tones from any of the
four input legs. You can use this output for connecting
monitoring equipment, because all signals coming into
the bridge appear at this output.
Refer to Fig. 4 and Table A for proper strap option
installation.
INSTALLATION
FIG. 3 - STRAP LOCATIONS
FIG. 4 - FOUR-WAY/FOUR-WIRE BRIDGE APPLICATION
PORT #1
PORT #4
PORT #2
PORT #3
44118
(NO)
HI LO
1R
HI LO
3R
HI LO
2X
+ +
+
+
+
+
HI LO
2R
LO HI
HI LO
4X
+
+
+
+
+
+
H1R
D1R
D3X
H3R D3R
H2R
D2R
H4R D4R
G3X B3X
D3H
HI
LO
1X
+
++
+
+
+
+
B2X D2H
D2X
G2X
G1X
B1X D1H
D1X
D4X
D4H
B4X
G4X
HI LO
4R
3X

44118-0798<90-00003> PAGE 9
OPTION
GAIN STRAPS
Receive Port 1
0 to -16 dB
0 to +7 dB
Receive Port 2
0 to -16 dB
0 to +7 dB
Receive Port 3
0 to -16 dB
0 to +7 dB
Receive Port 4
0 to -16 dB
0 to +7 dB
Transmit Port 1
0 to +7 dB
0 to -16 dB
Transmit Port 2
0 to +7 dB
0 to -16 dB
Transmit Port 3
0 to +7 dB
0 to -16 dB
Transmit Port 4
0 to +7 dB
0 to -16 dB
FOUR-WAY BRIDGE
Summing Bus IN
Transmit Distribution Networks OUT
Receive Distribution Networks OUT
STRAP IN
1R HI
1R LO
2R HI
2R LO
3R HI
3R LO
4R HI
4R LO
1X HI
1X LO
2X HI
2X LO
3X HI
3X LO
4X HI
4X LO
B1X, B2X, B3X, B4X
D1H, D2H, D3H, D4H
H1R, H2R, H3R, H4R
INSTALLATION
TABLE A - FOUR-WAY/FOUR-WIRE BRIDGE APPLICATION STRAP OPTIONS

PAGE 10 44118-0798<90-00003>
STEP
1
2
3
4
5
ACTION
A) Remove power from the module
receptacle.
B) Plug in 44118 module.
C) Apply power
Connect a 600 ohm terminated dB meter
across the 600 ohm output from the
signal generator. Set generator frequency
to 1 KHz.
Connect the 600 ohm terminated dB level
meter to the COMBINED DIST
OUTPUT jack (J9) on the 44118 front
panel.
Connect the signal generator to the LINE
RCV PORT 1 jack (J1) on the 44118 front
panel.
Move signal generator to the LINE RCV
PORT 2 jack (J3). Reset for port 2
receive level, if necessary.
RESULTS
Adjust generator level for reading equal to system
line receive test tone level (0 dBmO) for port 1. This
level will be between -16 and +7 dBm, according to
your companys requirements.
Leave the dB meter connected to J9 for steps 4
through 7.
Read distribution level on meter. Adjust the LINE
RCV PORT 1 level control (R7) for reading of
-10 dBm, or appropriate distribution level for the
system, if different. If desired level cannot be
reached, move the 1R gain strap to the HI or LO
position, as required.
Read distribution level on meter. Adjust the LINE
RCV PORT 2 level control (R24) for reading of
-10 dBm, or appropriate distribution level for the
system, if different. If desired level cannot be
reached, move the 2R gain strap to the HI or LO
position, as required.
CONTINUED . . .
INSTALLATION
Checkout
Table B provides the checkout and calibration procedures for a
four-way/four-wire bridge. Use the following test equipment for
checkout (refer to Fig. 5 for a front panel view):
♦Signal generator
♦Two bantam jack test cables (a bantam plug on one end, and
a plug to fit the meter and generator on the other)
♦dB level meter with 600-ohm termination
TABLE B - FOUR-WAY/FOUR-WIRE BRIDGE APPLICATION CALIBRATION PROCEDURE
FIG. 5 - FRONT PANEL, 44118
A11-44118-
44118-00
DISTRIBUTION
BRIDGE
LINE RCV
PORT 1
PORT 2
PORT 3
PORT 4
COMBINED
DIST
OUTPUT
PORT 1
PORT 2
PORT 3
PORT 4
LINE XMT
44118-00 REV__
J1
J3
J5
J7
J9
J2
J4
J6J6
J8
R7
R24
R38
R54
R16
R31
R46
R62

44118-0798<90-00003> PAGE 11
STEP
6
7
8
9
10
11
12
13
14
ACTION
Move signal generator to the LINE RCV
PORT 3 jack (J5). Reset for port 3
receive level, if necessary.
Move signal generator to the LINE RCV
PORT 4 jack (J7). Reset for port 4
receive level, if necessary.
Leave the signal generator connected to
J7 for steps 9 through 11. Do not change
generator level. Do not readjust any
receive level controls.
Move the 600 ohm terminated dB meter
to the LINE XMT PORT 1 jack (J2).
Move the 600 ohm terminated dB meter
to the LINE XMT PORT 2 jack (J4).
Move the 600 ohm terminated dB meter
to the LINE XMT PORT 3 jack (J6).
Move signal generator to the LINE RCV
PORT 1 jack (J1). Reset for port 1 receive
level, if necessary. Do not readjust any
receive level controls. Move the 600 ohm
terminated dB meter to the COMBINED
DISTRIBUTION OUTPUT jack (J9).
Move the 600 ohm terminated dB meter
to the LINE XMT PORT 4 jack (J8).
Calibration is complete. Remove the
signal generator and dB meter.
RESULTS
Read distribution level on meter. Adjust the LINE
RCV PORT 3 level control (R38) for reading of
-10 dBm, or appropriate distribution level for the
system, if different. If desired level cannot be
reached, move the 3R gain strap to the HI or LO
position, as required.
Read distribution level on meter. Adjust the LINE
RCV PORT 4 level control (R54) for reading of
-10 dBm, or appropriate distribution level for the
system, if different. If desired level cannot be
reached, move the 4R gain strap to the HI or LO
position, as required.
Read system line transmit test tone level (0 dBmO)
for port 1. Adjust the LINE XMT PORT 1 level
control (R16) for proper reading. If the desired
reading cannot be reached, move the 1X gain strap
to the HI or LO position as required.
Read system line transmit test tone level (0 dBmO)
for port 2. Adjust the LINE XMT PORT 2 level
control (R31) for proper reading. If the desired
reading cannot be reached, move the 2X gain strap
to the HI or LO position as required.
Read system line transmit test tone level (0 dBmO)
for port 3. Adjust the LINE XMT PORT 3 level
control (R46) for proper reading. If the desired
reading cannot be reached, move the 3X gain strap
to the HI or LO position as required.
Read -10 dBm, or the appropriate system level
distribution level, if different. This is the same level
as obtained in step 4.
Read system line transmit test tone level (0 dBmO)
for port 4. Adjust the LINE XMT PORT 4 level
control (R62) for proper reading. If the desired
reading cannot be reached, move the 4X gain strap
to the HI or LO position as required.
INSTALLATION
TABLE B (CONTINUED) - FOUR-WAY/FOUR-WIRE BRIDGE APPLICATION CALIBRATION PROCEDURE

PAGE 12 44118-0798<90-00003>
INSTALLATION
EIGHT-WAY/FOUR-WIRE BRIDGE APPLICATION
The 44118 Active Distribution Bridge eight-way/four-wire bridge
application features two interwired 44118 ADBs. You can
connect two independent 44020 DTMF decoders to the combined
distribution outputs (pins 1 and 37) of each module. This allows
split signaling routing. Receive ports on legs 1 to 4 route to
DTMF Decoder #1 and receive ports on legs 5 to 8 route to
DTMF Decoder #2. All locations maintain voice communication
while routing.
You can use two independent monitor systems for combined
distribution outputs. One system listens to traffic on legs 1 to 4,
and the other system listens to traffic on legs 5 to 8. If you use
only one decoder or monitor, you can combine the two distribu-
tion outputs by using a hybrid transformer or a resistive com-
biner. A combined distribution output load mismatch does not
affect the rest of the bridge.
Refer to Fig. 3 and Table C for proper strap option installation.
Checkout
Table D provides the checkout and calibration procedures for a
eight-way/four-wire bridge. Use the following test equipment for
checkout (refer to Fig. 5 for a front panel view):
♦Signal generator
♦Two bantam jack test cables (a bantam plug on one end, and
a plug to fit the meter and generator on the other)
♦dB level meter with 600-ohm termination

44118-0798<90-00003> PAGE 13
OPTION
GAIN STRAPS
Receive Port 1
0 to -16 dB
0 to +7 dB
Receive Port 2
0 to -16 dB
0 to +7 dB
Receive Port 3
0 to -16 dB
0 to +7 dB
Receive Port 4
0 to -16 dB
0 to +7 dB
Transmit Port 1
0 to +7 dB
0 to -16 dB
Transmit Port 2
0 to +7 dB
0 to -16 dB
Transmit Port 3
0 to +7 dB
0 to -16 dB
Transmit Port 4
0 to +7 dB
0 to -16 dB
FOUR-WAY BRIDGE
Summing Bus IN
Transmit Distribution Networks IN
Receive Distribution Networks IN
STRAP IN
1R HI
1R LO
2R HI
2R LO
3R HI
3R LO
4R HI
4R LO
1X HI
1X LO
2X HI
2X LO
3X HI
3X LO
4X HI
4X LO
B1X, B2X, B3X, B4X
D1X, D2X, D3X, D4X
D1R, D2R, D3R, D4R
INSTALLATION
TABLE C - EIGHT-WAY/FOUR-WIRE BRIDGE APPLICATION STRAP OPTIONS

PAGE 14 44118-0798<90-00003>
STEP
1
2
3
4
5
6
7
8
ACTION
A) Remove power from the module
receptacle.
B) Plug in 44118 module.
C) Apply power
Calibrate module #1 first. (It doesnt
matter which one is called #1.) Connect a
600 ohm terminated dB meter across the
600 ohm output from the signal
generator. Set generator frequency
to 1 KHz.
Connect the 600 ohm terminated dB level
meter to the COMBINED DIST
OUTPUT jack (J9) on the 44118 front
panel.
Connect the signal generator to the LINE
RCV PORT 1 jack (J1) on the 44118 front
panel.
Move signal generator to the LINE RCV
PORT 2 jack (J3). Reset for port 2
receive level, if necessary.
Move signal generator to the LINE RCV
PORT 3 jack (J5). Reset for port 3
receive level, if necessary.
Move signal generator to the LINE RCV
PORT 4 jack (J7). Reset for port 2
receive level, if necessary.
Leave the signal generator connected to
J7 for steps 9 through 11. Do not change
generator level. Do not readjust any
receive level controls.
RESULTS
Adjust generator level for reading equal to system
line receive test tone level (0 dBmO) for port 1. This
level will be between -16 and +7 dBm, according to
your companys requirements.
Leave the dB meter connected to J9 for steps 4
through 7.
Read distribution level on meter. Adjust the LINE
RCV PORT 1 level control (R7) for reading of
-10 dBm, or appropriate distribution level for the
system, if different. If desired level cannot be
reached, move the 1R gain strap to the HI or LO
position, as required.
Read distribution level on meter. Adjust the LINE
RCV PORT 2 level control (R24) for reading of
-10 dBm, or appropriate distribution level for the
system, if different. If desired level cannot be
reached, move the 2R gain strap to the HI or LO
position, as required.
Read distribution level on meter. Adjust the LINE
RCV PORT 3 level control (R38) for reading of
-10 dBm, or appropriate distribution level for the
system, if different. If desired level cannot be
reached, move the 3R gain strap to the HI or LO
position, as required.
Read distribution level on meter. Adjust the LINE
RCV PORT 4 level control (R54) for reading of
-10 dBm, or appropriate distribution level for the
system, if different. If desired level cannot be
reached, move the 4R gain strap to the HI or LO
position, as required.
CONTINUED . . .
INSTALLATION
TABLE D - EIGHT-WAY/ FOUR-WIRE BRIDGE APPLICATION CALIBRATION PROCEDURE

44118-0798<90-00003> PAGE 15
STEP
9
10
11
12
13
14
15
16
17
18
ACTION
Move the 600 ohm terminated dB meter
to the LINE XMT PORT 1 jack (J2).
Move the 600 ohm terminated dB meter
to the LINE XMT PORT 2 jack (J4).
Move the 600 ohm terminated dB meter
to the LINE XMT PORT 3 jack (J6).
Move signal generator to the LINE RCV
PORT 1 jack (J1). Reset for port 1 receive
level, if necessary. Do not readjust any
receive level controls. Move the 600 ohm
terminated dB meter to the COMBINED
DISTRIBUTION OUTPUT jack (J9).
Move the 600 ohm terminated dB meter
to the LINE XMT PORT 4 jack (J8).
Repeat steps 2 through 13 for module #2.
Check for cross-coupling of signals
between the two modules. For the
following steps, do not adjust the
transmit or receive levels on either
module.
Move the signal generator to the LINE
RCV PORT 1 jack (J1) of module #1.
Reset generator for port 1 receive level, if
necessary.
Move the dB meter to LINE XMT ports
1, 2, 3, and 4 of module #2.
Repeat steps 16 and 17, moving the
signal generator to LINE RCV ports 2, 3,
and 4 of module #1.
RESULTS
Read system line transmit test tone level (0 dBmO)
for port 1. Adjust the LINE XMT PORT 1 level
control (R16) for proper reading. If the desired
reading cannot be reached, move the 1X gain strap
to the HI or LO position as required.
Read system line transmit test tone level (0 dBmO)
for port 2. Adjust the LINE XMT PORT 2 level
control (R31) for proper reading. If the desired
reading cannot be reached, move the 2X gain strap
to the HI or LO position as required.
Read system line transmit test tone level (0 dBmO)
for port 3. Adjust the LINE XMT PORT 3 level
control (R46) for proper reading. If the desired
reading cannot be reached, move the 3X gain strap
to the HI or LO position as required.
Read -10 dBm, or the appropriate system level
distribution level, if different. This is the same level
as obtained in step 4.
Read system line transmit test tone level (0 dBmO)
for port 4. Adjust the LINE XMT PORT 4 level
control (R62) for proper reading. If the desired
reading cannot be reached, move the 4X gain strap
to the HI or LO position as required.
Read the system line transmit test tone level
(0 dBmO) for each port of module #2.
With each new LINE RCV port, read the system
line transmit test tone level (0 dBmO) at LINE
XMT ports 1, 2, 3, and 4 of module #2.
CONTINUED . . .
INSTALLATION
TABLE D (CONTINUED) - EIGHT-WAY/ FOUR-WIRE BRIDGE APPLICATION CALIBRATION PROCEDURE

PAGE 16 44118-0798<90-00003>
STEP
19
20
21
22
ACTION
Move the signal generator to the LINE
RCV PORT 1 jack (J1) of module #2.
Reset for port 1 receive level, if
necessary.
Move the dB meter to LINE XMT ports
1, 2, 3, and 4 of module #1.
Repeat steps 19 and 20, moving the
signal generator to LINE RCV ports 2, 3,
and 4 of module #2.
Calibration is complete. Remove signal
generator and dB meter.
RESULTS
Read the system line transmit test tone level
(0 dBmO) for each port of module #1.
With each new LINE RCV port, read the system
line transmit test tone level (0 dBmO) at LINE
XMT ports 1, 2, 3, and 4 of module #1.
INSTALLATION
TABLE D (CONTINUED) - EIGHT-WAY/ FOUR-WIRE BRIDGE APPLICATION CALIBRATION PROCEDURE
SUMMING AND DISTRIBUTION AMPLIFIER APPLICATION
Fig. 6 shows a summing and distribution amplifier application.
A signal received on the summing (common) port goes out the
other three ports, but the signal does not transmit through the
summing port.
A signal received at any of the distribution ports transmits
through the summing port, but does not transmit through the
distribution ports.
Fig. 7 shows a summing and distribution application using
multiple 44118 ADBs. Three interwired 44118 ADBs provide one
summing port and 11 distribution ports.
Refer to Fig. 3 and Table E for proper strap option installation.
Checkout
Table F provides the checkout and calibration procedures for a
summing and distribution amplifier. Use the following test
equipment for checkout (refer to Fig. 5 for a front panel view):
♦Signal generator
♦Two bantam jack test cables (a bantam plug on one end, and
a plug to fit the meter and generator on the other)
♦dB level meter with 600-ohm termination

44118-0798<90-00003> PAGE 17
SUMMING
PORT
#1 45
47 1
1
#1 27
33
4
2
3
2
52
2
41
43
3
19 7
9
4
51 3
5
#2
#3
#4
13
31
15
25
11
29
42
#2
#3
#4
44118
1
44 45
47 #5
44118
2
52 41
43 #6
3
19 7
9#7
4
51 3
5#8
4
34 13
31 #8
3
24 15
25 #7
2
14 11
29 #6
1
427
33 #5
1
44 45
47 #9
44118
2
52 41
43 #10
3
19 7
9#11
4
51 3
5#12
4
34 13
31 #12
3
24 15
25 #11
2
14 11
29 #10
1
427
33 #9
TO ADDITIONAL
44118s
FROM ADDITIONAL
44118s
Install these jumpers
in the unit with the
summing port.
D1R
H2R
H3R
H4R
D1X
D2X
D3X
D4X
B1X
G2X
G3X
G4X
Install these jumpers
in all other units.
D1R
D2R
D3R
D4R
D1X
D2X
D3X
D4X
G1X
G2X
G3X
G4X
DISTRIBUTION
PORT
SUMMING
PORT DISTRIBUTION
PORT
DISTRIBUTION
PORT
INSTALLATION
FIG. 6 - SUMMING AND DISTRIBUTION AMPLIFIER EXAMPLE APPLICATION
FIG. 7 - SUMMING AND DISTRIBUTION W/ MULTIPLE BRIDGES

PAGE 18 44118-0798<90-00003>
NOTE: In Fig 7, Port 1 of the first module is the summing port and
ports 2, 3, and 4 are distribution ports and are strapped as described
above. All the ports on the other modules are distribution ports and
each module is strapped as follows:
D1R, D1X, G1X
D2R, D2X, G2X
D3R, D3X, G3X
D4R, D4X, G4X
OPTION
GAIN STRAPS
Receive Port 1
0 to -16 dB
0 to +7 dB
Receive Port 2
0 to -16 dB
0 to +7 dB
Receive Port 3
0 to -16 dB
0 to +7 dB
Receive Port 4
0 to -16 dB
0 to +7 dB
Transmit Port 1
0 to +7 dB
0 to -16 dB
Transmit Port 2
0 to +7 dB
0 to -16 dB
Transmit Port 3
0 to +7 dB
0 to -16 dB
Transmit Port 4
0 to +7 dB
0 to -16 dB
STRAP IN
1R HI
1R LO
2R HI
2R LO
3R HI
3R LO
4R HI
4R LO
1X HI
1X LO
2X HI
2X LO
3X HI
3X LO
4X HI
4X LO
NOTE: Check the drawings for your application to determine which
of the four ports is the summing port, then strap the module
accordingly.
PORT 1 SUMMING
(Ports 2, 3, & 4
Distribution)
D1R, D1H, B1X
H2R, D2X, G2X
H3R, D3X, G3X
H4R, D4X, G4X
PORT 2 SUMMING
(Ports 1, 3, & 4
Distribution)
H1R, D1X, G1X
D2R, D2H, B2X
H3R, D3X, G3X
H4R, D4X, G4X
PORT 3 SUMMING
(Ports 1, 2, & 4
Distribution)
H1R, D1X, G1X
H2R, D2X, G2X
D3R, D3H, B3X
H4R, D4X, G4X
PORT 4 SUMMING
(Ports 1, 2, & 3
Distribution)
H1R, D1X, G1X
H2R, D2X, G2X
H3R, D3X, G3X
D4R, D4H, B4X
INSTALLATION
TABLE E - SUMMING AND DISTRIBUTION APPLICATION STRAP OPTIONS
UPDATED

44118-0798<90-00003> PAGE 19
STEP
1
2
3
4
5
6
7
8
ACTION
A) Remove power from the module
receptacle.
B) Plug in 44118 module.
C) Apply power
Connect a 600 ohm terminated dB meter
across the 600 ohm output from the
signal generator. Set generator frequency
to 1 KHz.
Connect the 600 ohm terminated dB level
meter to the COMBINED DIST
OUTPUT jack (J9) on the 44118 front
panel.
Connect the signal generator to the LINE
RCV PORT 1 jack (J1) on the 44118 front
panel.
Move signal generator to the LINE RCV
PORT 2 jack (J3). Reset for port 2
receive level, if necessary.
Move signal generator to the LINE RCV
PORT 3 jack (J5). Reset for port 3
receive level, if necessary.
Move signal generator to the LINE RCV
PORT 4 jack (J7). Reset for port 4
receive level, if necessary.
Move the signal generator to the LINE
RCV port that is being used as the
summing port. Reset the generator for
the port receive level, if necessary.
Connect the 600 ohm level meter to the
LINE XMT distribution ports, one at a
time. For example, if port 1 is the
summing port, connect the generator to
LINE RCV port 1 and the dB meter to
LINE XMT ports 2, 3, and 4.
RESULTS
Adjust generator level for reading equal to system
line receive test tone level (0 dBmO) for port 1. This
level will be between -16 and +7 dBm, according to
your companys requirements.
Leave the dB meter connected to J9 for steps 4
through 7.
Read distribution level on meter. Adjust the LINE
RCV PORT 1 level control (R7) for reading of
-10 dBm, or appropriate distribution level for the
system, if different. If desired level cannot be
reached, move the 1R gain strap to the HI or LO
position, as required.
Read distribution level on meter. Adjust the LINE
RCV PORT 2 level control (R24) for reading of
-10 dBm, or appropriate distribution level for the
system, if different. If desired level cannot be
reached, move the 2R gain strap to the HI or LO
position, as required.
Read distribution level on meter. Adjust the LINE
RCV PORT 3 level control (R38) for reading of
-10 dBm, or appropriate distribution level for the
system, if different. If desired level cannot be
reached, move the 3R gain strap to the HI or LO
position, as required.
Read distribution level on meter. Adjust the LINE
RCV PORT 4 level control (R54) for reading of
-10 dBm, or appropriate distribution level for the
system, if different. If desired level cannot be
reached, move the 4R gain strap to the HI or LO
position, as required.
As the dB meter is moved to each LINE XMT port,
read the system line transmit test tone level
(0 dBmO) for that port. Adjust the LINE XMT port
level control for that port.
CONTINUED . . .
INSTALLATION
TABLE F - SUMMING AND DISTRIBUTION APPLICATION CALIBRATION PROCEDURE

PAGE 20 44118-0798<90-00003>
STEP
9
10
11
12
13
14
15
16
ACTION
Move the dB meter to the LINE XMT
port that is being used as the summing
port. Connect the generator to the LINE
RCV distribution ports, one at a time. For
example, if port 1 is being used as the
summing port, connect the dB meter to
LINE XMT port 1 and the generator to
LINE RCV ports 2, 3, and 4. At each of
the LINE RCV ports, reset the generator
for the receive level of that port, if
necessary.
If there is only one module being
calibrated, this completes the procedure.
Remove the generator and the dB meter.
If there is more than one module (refer to
Fig. 7), continue to step 11.
Connect the dB meter to the COMBINED
DIST OUTPUT jack (J9) on the front
panel of the next 44118 to be calibrated.
Adjust the signal generator for the
proper receive test tone level (0 dBmO)
for port 1. Connect the generator to the
LINE RCV PORT 1 jack (J1) on the
44118 front panel.
Repeat step 11 for each of the other LINE
RCV ports on the 44118 module.
Move the dB meter to the LINE XMT
summing port on the 44118 module with
the summing port. Connect the signal
generator to the four LINE RCV ports,
one at a time, on the module being
calibrated. Reset the generator level for
each port, as necessary.
Move the generator to the LINE RCV
summing port on the module with the
summing port. Reset the generator level,
if necessary. Connect the dB meter to the
four LINE XMT ports, one at a time, in
the module being calibrated.
Repeat steps 11-14 for additional 44118
modules.
Calibration complete. Remove the
generator and dB meter.
RESULTS
At the LINE XMT summing port, read the system
line transmit test tone level (o dBmO) for that port.
Adjust the LINE XMT port level control for that
port.
NOTE: Make the LINE XMT port level adjustment
only once. When the generator is moved to other
distribution ports, it is only to verify signal path
continuity. The LINE XMT level will remain the
same.
Read distribution level on meter. Adjust the LINE
RCV PORT 1 level control (R7) for reading of
-10 dBm, or appropriate distribution level for the
system, if different. If the desired reading cannot be
reached, move the 1R gain strap to the HI or LO
position as required.
Adjust the receive level for each port, if necessary.
Read the proper line transmit test tone level. The
LINE XMT level at the summing port will be the
same from all the LINE RCV distribution input
ports.
Read system line transmit test tone level (o dBmO)
for each port. Adjust the LINE XMT level for each
port for the proper reading.
INSTALLATION
TABLE F (CONTINUED) - SUMMING AND DISTRIBUTION APPLICATION CALIBRATION PROCEDURE