Table 4-7. Sample cutsheet for 2-wire voice circuit t (25 Hz signaling and echo suppressor control)

TM 11-5895-1012-10

line terminated at bay 4.1 on TB3, row 5, pins K and L

(4) The E&M/25 Hz converter and echo su

to the E&M/25 Hz ring down converter's Send In (T1,

has approximately 0 dB insertion loss and will not af-

R1) line terminated at bay 4.1 on TB3. row 6, pins A

fect the circuit levels.

and B by cross-connecting at buy 4.1, TB3, row 5, pins

c. In-Station Testing After the correct circuit levels

K and L, to TB3, row 6, pins A and B respectively.

have been obtained, perform the in-station test proce-

(13) Connect the 2/4 wire terminating set termi-

dures contained in chapter 6. To use a test on a 2 wire

nated at bay 4.1 on block TB3, row 5, pins E and F to

circuit, use the same two-wire circuit for both transmit

the VF primary patch panel terminated on block

and receive tests and omit the terminating resistor

H13K, row 1, pins 3 and 4 by cross-connecting at bay

when necessary.

4.1, TB3, row 5, pins 3 and F to TB9, row 5, pins E and

d. Multiplexer Equipment Connections. Refer to

F respectively and block V9F, row 10, pins 1 and 2 to

the sample cutsheet (table 4-7) and cross-connect as

block H13K, row 1, pins 3 and 4 respectively.

follows:

(14) Connect the E&M/25 Hz ringdown converter

(1) Connect the multiplexer receive circuit termi-

Receive In line terminated at bay 4.1 on TB3, row 6,

nated on block V32K, row 1, pins 3 and 4 to the equal

pins C and D to the VF primary patch panel equipment

level patch panel DEM IN (line) terminated on block

side (T1, R1) terminated on block H13K, row 1, pins 3

H17J, row 1, pins 1 and 2 by cross-connecting block

and 4 by cross-connecting at bay 4.1 TB3, row 6, pins

V32K, row 1, pins 3 and 4 to block H17J, row 1, pins 1

C and D to TB9, row 6, pins C and D respectively and

and 2 respectively.

block H13K, row 1, pins 3 and 4 to block V9F, row 11,

(2) Connect the multiplexer transmit circuit

pins 3 and 4 respectively.

terminated on block V32K, row 1, pins 1 and 2 to the

b. Voice Frequency Level Adjustments. The In-

equal level patch panel MOD OUT (Line) terminated

Station test will be run before connecting to the multi-

on block H17K, row 1, pins 1 and 2 by cross-connect-

plexer equipment. Adjust levels from the equal level

ing block V32K, row 1, pins 1 and 2 to block H17J,

patch panel to the primary patch panel as follows:

row 1, pins 1 and 2.

(1) At the equal level patch panel, the receive and

c. Final Testing. Perform the out-of-service quality

transmit levels will be at 0 dBm.

control (station-to-station) testing contained in chap

(2) The SF-2600 has approximately 0 dB inser-

ter 6. If the circuit checks out in accordance with the

tion loss and will not affect the circuit level.

testing and conforms to established parameters, then

(3) Adjust amplifiers 1 and 2 for a 12 dB gain and

report the circuit ready for operation in accordance

pads 1 and 2 for an 8 dB loss to compensate for the 4

with established procedures.

dB insertion loss of the 4 wire termination set and al-

low an operation level of 0 dBm at the voice frequency

Table 4-7. Sample cutsheet for 2-wire voice circuit t (25 Hz signaling and echo suppressor control)

4-48