Miscellaneous/Interbay Patch Panels and Trunking

TM 11-5895-1012-10

cellaneous patch panel function as described in a and b

radio communication links. The interconnection dia-

above respectively. The jacks contain normal-through

gram of the receive panel is show in figure FO-4 and

contacts for greater flexibility as shown in figure

the interconnection diagram of the transmit panel is

2-22.

shown in figure FO-5. It can be seen that the wiring is

d. Interbay Trunking Systems. The Technical Con-

similar to that previously discussed with the exception

of the cut keys and lamps.

trol Facility-has a voice frequency trunking system

and a dc trunking system. The systems are designed to

(2) Receive Panel Cut Keys Functioning (fig.

allow sufficient trunking of circuits from one patch or

FO-4). When the cut key is operated to the down posi-

test bay in the vf or dc area to any other bay in that

tion, the indicator light is energized and the normal-

area. The vf and dc interbay trunking systems are not

through circuit is broken and terminated. The receive

interconnected and come together only at the intermit-

circuit from the LINE side of the panel is terminated

tent test stations.

through a 5.6K ohm loop resistor to ground. The tip

(1) Voice Frequency Interbay Trunking System.

lead of the circuit toward the Technical Control Facil-

The interbay trunking capability in the vf area is pro-

ity equipment is connected to hold battery. The corre-

vided by interbay patch panels which are mounted in

sponding ring lead is connected to an S lead and output

the bottom of every vf patch and test bay. The panel

via connector C1. This S lead provides a through path

has two rows of 24 jacks per row for a total of 48 inter-

for any timing circuits which are present when the cut

bay trunk appearances per bay. The front view of the

key is operated. Contact No. 5 energizes the lamp and

panel resembles that shown in figure 2-21, however

output -48 vdc through the L lead to connector C2.

the interconnection diagram is that shown in figure

The L lead provides the capability of energizing

2-23. Terminal blocks Cl and C2 of each panel are

remote lamp to indicate that the circuit is cut.

cabled to the vf cdf where the panels are cross-connect-

(3) Transmit Panel Cut Key Functioning (fig.

ed to form a series interbay trunking system. The

FO-5). This cut key functions in a similar fashion as

cross-connecting is done in such a manner that the

that discussed (2) above, except the loop resistor is

same jack in each panel is assigned to the same patch

placed in the cut circuit on the EQUIP side of the

or test bay. As an example, Jack 2, Bow 2, of every

patch panel and the hold battery is placed on the LINE

panel provides a trunk to the same bay. This scheme is

Side.

shown in figure 2-24A. TCF personnel can alter the

2-37. Miscellaneous/Interbay Patch Pan-

pattern as desired to provide additional trunks be-

els and Trunking

tween heavy traffic bays or between bays and test sta-

tions. This system provides, generally, only one trunk

a Miscellaneous Patch Panels (fig. 2-21). Miscella-

between any two voice frequency bays or test stations.

neous (MISC) patch panels are located in the patch and

However, the patch cord length usually allows the use

test bays to provide the flexibility required for test

of trunks on either side of the bay providing three

and monitoring operations. The jacks are wired and

trunks to any one bay by direct trunking.

cross-connected as desired by TCF personnel. Figure

(2) DC Interbay Trunking System. Interbay trunk-

2-21 provides a typical functional arrangement for a

miscellaneous panel with 10 lamps in a Technical Con-

ing capability in the dc area is provided by interbay

patch panels with 48 lamps mounted in the dc patch

trol Facility. Figure 2-27 provides the patch panel

and test bays. The panel has two rows of 24 jacks and

interconnection diagram and block terminations. The

two rows of 24 in-use lamps, as shown in figure 2-25.

patch panel provides such desirable jack arrangements

The panel interconnection diagram is shown in figure

and functions as 600 ohm loads, parallel jacks, line re-

2-26. The lamps are necessary since these cross panels

versing (tip-to-ring, ring-to-tip), and -48 vdc power.

are interconnected at the dc cdf into a parallel config-

The -48 vdc power is supplied via jacks 1 of rows 1

uration (fig. 2-24B). Every pin on the block of one

and 2. These two jacks are engineered to avoid unsafe

or undesired jacking of the -48 vdc by designing the

interbay panel with 48 lamps IS jumpered to the corre-

jacks for use only with a special double pronged MISC

sponding pin on the blocks of every second panel (odd

panels form a parallel configuration and even panels

DC patch cord. Jack 1, row 1 is an undersized jack

which will accept only one prong of this patch cord.

form another parallel configuration). Each parallel

b. Interbay Patch Panels. Each patch and test bay

configuration has 48 trunks for a total of 96 trunks in

contains in interbay (INT) patch panel. Interbay

the dc area. The configurations are referred to as

parallel since an interbay trunk appears on the same

trunks are used to route circuits to other patch bays in

the Technical Control Facility. The various types of

jack of every second INT panel appearance. As an ex-

interbay trunks in the TCF are described below.

ample, Jack 1, Row 1 of one panel is in parallel with

c. MISC/INT Patch Panels (fig. 2-22). These pads,

Jack 1, Row 1 of the INT panel two bays away and so

located in dc patch and test bays, may be used to per-

on until all odd numbered and all even numbered bays

form either an interbay patch panel function or a mis-

are interconnected to form the two separate configura

2-45