Section III. TYPICAL BLACK AND RED DIGITAL CIRCUITS AND PATCH PANEL CONFIGURATIONS

TM 11-5895-878-14&P

Section III. TYPICAL BLACK AND RED DIGITAL CIRCUITS

AND PATCH PANEL CONFIGURATIONS

the line equipment.

2-6. Digital Circuits, General

The P&T of the TCF provides cross-connection,

c. Receive Circuit.

To complete the receive

monitoring, testing, circuit patching access, and timing

circuit, dual cross-connect patch cords are installed as

clock for black and red digital circuits. Black and red

follows:

circuits are discussed in paragraphs 2-7 and 2-8. As shown

(1) Patch cord No. 7, from jacks 1 and 2, row

in figures FO-2.1 and FO-2.2, black and red circuits may be

2, module A, panel 1 to jacks 1 and 2, row 3, module A,

connected back to back at the P&T to bring a channel.

panel 2 connects the receive data line to the tip () lead

through the TCF. Station timing clock isolation circuits are

of the patch panel receive jack set. The T lead is

discussed in paragraph 2-9.

All digital circuits are

normal-through connected to the T1 lead of the patch

connected through a Universal Digital Patch Panel. The

panel jack set and cabled to jack 1, row 4, module A,

patch panel and its different configurations are discussed in

panel 2 of IDF. The same patch cord connects the

paragraphs 2-10 and 2-11.

receive data return line to a common tie point and to

jack 2, row 4, module A, panel 2 of the IDF.

2-7. Typical Black Digital Circuit

(2) Patch cord No. 10, from IDF jacks 1 and

(fig. FO-5)

2, row 4, module A, panel 2 to jacks 1 and 2, row 2,

a. General. In this example of a black digital circuit,

module A, panel, 6 completes the receive data

the Universal Digital Patch Panel jack sets are

connection from the patch panel jack set to the receive

programmed with a group 4 module in the send circuit and

pair of the local equipment.

a group 5 module in the receive circuit. Refer to paragraph

(3) Patch cord No. 8, from jacks 3 and 4, row

2-11e and f for patch panel circuit details. This circuit is

2, module A, panel 1 to jacks 3 and 4, row 3, module A,

crossconnected in IDF bay 1.10. The local equipment

panel 2 connects the receive clock to the ring (R) lead of

(EQUIP side of circuit) is cabled to module A of panel 6.

the patch panel jack set. The R lead is normal-through

The line equipment (LINE side of circuit) is cabled to

wired to the R1 lead of the jack set and cabled to jack 3,

module A of panel 1. The jack sets of the Universal Digital

row 4, module A, panel 2 of the IDF. The same patch

Patch Panel are cabled to module A of panel 2. Optional

cord also connects the receive clock return to a

devices are not used, but connections that could be used

common tie point and to jack 4, row 4, module A, panel

are shown.

2 of the IDF.

b. Send Circuit. To complete the send circuit, dual-

(4) Patch cord No. 11, from jacks 3 and 4,

plug, cross-connect patch cords are installed as follows:

row 4, module A, panel 2 to jacks 3 and 4, row 2,

(1) Patch cord No. 4, from jacks 1 and 2, module

module A, panel 6 completes the receive clock circuit to

A, panel 6 to jacks 1 and 2, row 2, module A, panel 2. This

the local equipment.

connects the transmit data output of the local equipment to

pin 5 of patch panel connector C- 1. This is the jack sets

2-8. Typical Red Digital Circuit

tip (1) lead, which is normal-through wired to pin 1 (tipT) of

(fig. FO-6)

patch panel connector C-1. Pin 1 of C-1 is cabled to jack 1

a. General. In this circuit the equipment and three

of row 1 in module A, panel 2. The transmit data return is

patch panel jack sets in bay 2.10 are cabled to IDF bay

also cross-connected with patch cord No. 4, and is

2.21. The line equipment is connected to module A of

connected to a common tie point.

panel 1. The patch panel jack sets are wired to module

(2) Patch cord No. 1, between jacks 1 and 2, row

A of panel 2. The local equipment is connected to

1, module A, panel 2 and pins 1 and 2, row 1, module A,

module A of panel 8. Refer to paragraph 2-11 b, c, and

panel 1 completes the transmit data and transmit data

d for patch panel circuit details. A red digital circuit is

return to the line equipment.

connected similar to a black digital circuit (para 2-7)

(3) Patch cord No. 5, from jacks 3 and 4, row 1,

except: (1) The circuit is located in equipment row 2 in

module A, panel 6 to jacks 3 and 4, row 2, module A, panel

place of equipment row 1; (2) A control jack set (third

2 connects the transmit clock through the R1 and R leads

jack set) may be used when control functions are

of the patch panel jack set, to jacks 3 and 4, row 1, module

required (b below); (3) The station clock must be

A, panel 2 of the IDF. The transmit clock return is also

connected through a line isolation circuit (c below); (4)

connected to the common tie point through patch cord No.

Timing clock circuits are not used.

b. Control Circuit. To complete the data inhibit and

(4) Patch cord No. 2, from jacks 3 and 4, row 1,

synchronize circuits, dual-plug cross-connect patch

module A, panel 2 to jacks 3 and 4, row 1, module A, panel

cords are installed as follows:

1 completes the transmit clock and transmit clock return to

(1) Patch cord No. 13, from jacks 3 and 4, row 2,

2-19