Technical Control Configuration

TM 11-5895-1012-10

(5) Line-of-sight radio circuits.

operating space, as indicated on the diagram. Figure

(6) Earth satellite radio circuits.

2-7 shows a typical floor plan for a Technical Control

b. The Technical Control Facility functions to pro-

Facility.

vide technical direction, coordination, technical super-

b. Primary Patch Bay.

vision of transmission media and equipment, quality

(1) Dc and Digital. The dc and digital primary

control, communications restoral and status reporting.

patch bays are those areas within the TCF where dc

These functions are accomplished with the following

and digital user circuits can be patched, monitored and

five basic operations:

tested. Signals may be high or low level and baud rate

(1) Patching (r&oral, test, monitor).

depending on the user terminal equipment.

(2) Coordination (to far-end, to user, to mainte-

(2) Voice Frequency (VF). The vf primary patch

name).

bay is that area within the TCF where voice frequency

(3) Testing (insertion of a known signal with

circuits can be patched, monitored and tested. Signal

measurement for frequency, level, distortion, etc. on

will have varying levels and signalling schemes de-

an out-of-service basis).

pending on the user terminal equipment.

(4) Monitoring (measurement of existing circuit

c. Circuit Conditioning Equipment. Circuit condi-

conditions or traffic, without insertion of a test signal,

tioning equipment, such as amplifiers, pads, hybrids

on an in-service basis).

etc., signalling equipment, digital line interface units

(5) Reporting (circuit and system status to users,

(DLIU), and circuit ancillary equipment is so installed

adjacent TCF's, circuit distant end, operation and

and wired into the TCF so that it will appear between

maintenance activities, etc., as well as all required re-

the primary and equal level patch bays.

petitive reports).

d. Equal Level Patch Bay. The equal level patch bay

c. Normally, the TCF is collocated with a tape relay

is that area within the Technical Control Facility

and switching center, and/or a carrier terminal facil-

where voice frequency channels at the standard Test

ity, but it may be located with either a radio station or

Level Point (TLP (OdBr send and receive)) utilizing

telephone facility. The choice of location is usually

standard in band signalling can be patched, monitored

based on a study of all factors involved in site selec-

and tested.

tion. By choosing to collocate the Technical Control

e. Group Patch Bay. The group patch bay is that

Facility with the tape relay or switching facility elimi-

area where multiplexed groups (usually 12 channels

nates the necessity of providing additional intrasta-

can be patched, monitored, and tested.

tion links. All circuits, regardless of the media used

f. Coaxial Patch Buy. The coaxial patch bay is that

and type of signal, are available at jack appearances at

a associated with the TCF where signals requiring

the TCF. These appearances provide the flexibility re-

distribution via coaxial cable can be patched, moni-

quired by a TCF. There are exceptions to this rule

tored, and tested. Signals which require coaxial cable

where circuits transit the station on a through group

distribution include supergroup, baseband, high speed

Time Division Multiplexed signals, etc.

level. However, there are group access points, which

allows access to the circuits being carried on a through

g. Dc Circuit Bay (Low/Level) and Digital Patch

group for testing purposes. These access points nor-

Buy. The dc circuit and digital patch bays are those

areas within the Technical Control Facility where low

mally located at the multiplex equipment outside the

level analog or digital data circuits can be patched

TCF, can also be used as patching points for restoral or

rerouting of groups in the event of system failure.

monitored and tested

h. Patch Panel Appearances. Patch panel appear

2-16. Technical Control Configuration

ances are furnished and installed for the following

Block Diagram

(1) Allow for substitution for those units which

(fig. 2-6 and 2-7)

are out of service because of test and maintenance of

the facility.

a. General. The block diagram illustrates the inter-

(2) Allow for substitution of equipment strings

relationship among the major equipment of the Tech-

(circuit or wideband segments) as they occur between

nical Control Facility together with the terminal

the primary and equal level patch panel appearances.

equipment. Although the Technical Control Facility of

i. Time Division Multiplexer Equipment (TDM). The

many DCS Stations may not require access to all trans-

time division multiplexer equipment is a technique to

mission modes shown in figure 2-6, the TCF configu-

accept various digital signals (both data and teletype)

ration should be essentially the same, whether the sta-

with different bit rates and combine them into a single

tion is located at a transmission nodal point or termi-

high bit rate stream for transmission. The demulti-

nal point. The block diagram includes all major equip

plexer section reconstructs the signals at the same

ment and patch facilities which are involved in the

nominal rate at which they entered the multiplexer

overall technical control function, however, all items

This equipment can be used in tandem to accommo-

will not necessarily be located with the immediate TCF

2-12