Interbay Trunking Systems

TM 11-5895-878-14&P

(3) Black vf (c below).

s. QA Test Center, Equipment Connection Panel.

Bay 1 of the QA Test Center (fig. 1-15) contains an in

(4) Red vf.

house uilt equipment connection panel (fig. 2-39).

(5) Red QA (d below).

The panel provides connection to equipments with out

b. Digital Interbay Trunking Systems. The black

front panel connection.

Also, a single-pole-single-

and red systems use INT panels with 48 jacks and 48

through switch is provided to connect the HP-3490A

lamps (fig. 2-41). The panel has two rows of 24 jacks

multimeter to the IP-5050B digital recorder. In addition,

and two rows of 24 in-use lamps. The first 20 sets of

the switch may also be set to connect the HP-5245L

jacks and lamps in each row (1 through 20, and 25

electronic counter (FREQ COUNTER) to the HP-5050B

through 45) are connected in a parallel configuration at

digital recorder. All connectors on the panel are BNC

the IDF. That is, all No. 1 jacks are paralleled to each

type. BNC to banana jack adapters are used on all

other, all No. 2 jacks are paralleled to each other etc.

connectors except the 601 BIT ERROR TEST SET

The in-use lamps (fig. 2-42) are wired to their associated

connector. This connection requires an AMP, 25-pin

jacks so that when a patch cord plug is inserted into the

type.

jack, all the same No. lamps in that system light. This

t. Miscellaneous Patch Panels (fig.

2-40).

indicates which interbay trunks are in use. The last four

Miscellaneous patch panels are located in the patch and

sets of jacks and lamps in each panel (21 through 24,

test facilities to provide the flexibility required for test

and 45 through 48) are provided for use as

and monitoring operations. The jacks are wired and

miscellaneous jacks.

cross-connected as desired by the site personnel.

c. VF Interbay Trunking Systems. The interbaying

Figure 2-40 provides a typical function arrangement for

capability in the VF area is provided by the interbay

a miscellaneous. panel with 10 lamps in a TCF. Figure

patch panels which are mounted in the bottom of every

2-46 provides the panel schematic and block

VF patch and test bay. The panel has two rows of 24

terminations. The panel provides such desirable jack

jacks per row for a total of 48 interbay trunk

arrangements and functions as 600 Ohms load, parallel

appearances per bay. The front view of the panel

jacks, line reversing (top-to-ring, ring-to-tip), and test

resembles that shown in figure 2-40; however, there are

equipment connections.

no lamps in the panel. The schematic is that shown in

u. Interbay Patch Panels. Each patch and test bay

figure 2-43. Terminal blocks C1 and C2 of each panel

contains an INT Panel. Interbay trunks are used to

are cabled to the IDF where the panels are cross-

route circuits to other patch bays in the station. The

connected to form a "series" interbay trunking system.

various types of INT patch panels in the P&T are

The cross-connecting is done such that each circuit is

discussed in paragraph 2-17.

private. That is one jack in a bay is only cross-

connected to one jack in the other bay. The first three

2-17. Interbay Trunking Systems

sets of jacks in bays 1.2 through 1.7 in the black system

are labeled 1.1. Bay 1.1 is an IDF and does not have an

a. General. The P&T has five different interbay

INT panel. These six jacks in each bay are cross-

trunking systems. The systems are designed to allow

connected to the black INT panel in bay 3 of the QA

sufficient trunking of circuits from one patch or test bay

Test Center (fig. 1-15). The red vf system consists of

in a system to other bays in that system. The trunking

two INT panels, bays 2.19 and 2.20 (fig. 1-14).

systems are not interconnected and come together only

at the intermittent test stations. The systems are listed

below.

(1) Black digital (b below).

(2) Red digital.

2-53