CHAPTER 2 STATION APPLICATION AND EQUIPMENT FUNCTION

TM 11-5895-878-14&P

CHAPTER 2

STATION APPLICATION AND EQUIPMENT FUNCTION

Section I. STATION APPLICATION

capabilities, typical circuits in and through the TCF and

2-1. Introduction

the functions of equipment. Refer to DCS publications

(fig. FO-2(1) and FO-2(2))

to become familiar with other types of communication

a. Pentagon Telecommunications Center. The US

circuits and links.

Army Communications Command (USACC) Pentagon

Telecommunications Center (ITC) is a terminal station

that provides a transmission system interface with the

2-3. Intermediate Distribution Frames

Defense Communications Systems (DCS) for Army,

a. General. There are four IDF's in the P&T area.

Department of Defense, and other Government

They are an integral part of the technical control. As

agencies located at the Pentagon and surrounding areas

shown in figures FO-2.1 and FO-2.2 each equipment's

near Washington DC. The PTC provides various users

signaling input and output connections are terminated at

with high priority voice, data, and video service, most of

an IDF. In addition, the input and output signals of each

which is encrypted. The transmission media utilized are

patch panel and circuit line are also terminated at an

military-owned

microwave,

commercial-owned

IDF. (Wide band circuits are not connected through

baseband radio, and commercial cable. In addition, a

IDF's.)

large number of "in-house" cables are used to provide

b. Description. Each IDF (fig. 2-1) consists of a

connectivity for the user locations throughout the

matrix made up of rows of cross-connect panels. A

Pentagon building complex.

panel contains ten jack type patch modules (A through

b. Technical Control Facility. The Army Technical

H, and J and K). Each module (fig. 2-2) has six

Control Facility (TCF) at the Pentagon provides

multicolored rows of 26 jacks. The color of the jack

technical control over RED and BLACK-VF, DC,

rows at the front of the modules, from left to right are:

DIGITAL, and VIDEO circuits appearing at the TCF.

Red (A), white (B), blue (C), yellow (D), black (E), and

These are comprised of military-owned VRCT systems

orange (F). Each of the 156 jacks is connected to a pin

and leased DC and data circuits. The high speed data

on one of three associated connectors mounted on the

circuits are in the !400 to 50K BAUD range. The low

rear of the panel. The first 48 jacks on the module are

speed circuits are pre/dominantly secure circuits. Test

connected to pins 1 through 48 on connector J1.

and maintenance is also provided on Government-

Module jacks 49 through 96 are connected to pins 1

owned lines and circuits.

through 48 on connector J2. Module jacks 97 through

144 are connected to pins 1 through 48 on connector J3.

Module jacks 145 through 156 are also connected to

2-2. Patch and Test Facility

connectors J1, J2, and J3.

Four jacks to each

a. The P&T function includes the monitoring of

connector. The connectors are cabled to patch panels,

circuits and equipment within a station, as well as the

land lines, and equipment. Circuits are built by cross-

selection and application of station facilities and

connecting between the jacks of the circuit component

associated equipment, as needed to keep the station's

modules with cross-connect patch cords.

operating and standby communications links and circuits

c. Black VFIDF, Bay 1.1. Bay 1.1 (fig. 2-3) is

at peak efficiency. The technical controller coordinates

changes in communications services at the station,

actually two bays. Each bay contains eight cross-

performs alternate routings, directs the correction of

connect panels (b above). Cable details (at the time of

malfunctions, restores service when outages occur, and

installation) are shown in figures 2-4 and 2-5.

coordinates link and station tests. The P&T facility

d. Black Digital IDF, Bay 1.10. Bay 1.10 (fig. 2-6)

within the station encompasses these areas which are

consists of three bays of eight cross-connect panels (b

equipped with jacks, and test instruments to provide

above). Cable details (at the time of installation) are

access to the circuits for the purpose of performing

shown in figures 2-7, 2-8, and 2-9.

monitor, patch and test operations.

e. Red Digital and VF IDF, Bay 2.21. Bay 2.21

b. To efficiently perform the technical control

(fig. 2-10) consists of four bays of eight cross-connect

functions required to keep all communication links at

panels (b above).

Cable details (at the time of

their peak operating condition, all personnel must be

installation) are shown in figures 2-11 through 2-14.

thoroughly familiar with the station capabilities and the

f. Special Intelligence IDF, Bay 2.1. There are two

functions of all /equipment in the station. In addition,

cross-connect panels (fig. 2-15) at the bottom of the S.I.

familiarization with circuit links of related technical

bay.

controls is required. This chapter discusses the station

2-1