This Thelephone Terminal Group was housed in a S-180/MTA-4 (modified S-141/G) and later in a modified S-280B/G Shelter. The AN/MTA-4A is together with the AN/MTA-3A Thelephone Switchboard Group part of the AN/MTC-1 Central Office, Telephone, Manual. As shelter the S-141B/G was used in stead of the older S-141/G.
3 Main Distribution Frames TA-257/TTC
2 Line Relays TA-223A/TTC
1 Line Relay TA-226A/TTC
1 Power Distribution Panel SB-1032/TTC
4 Batteries BB-46
3 Telephone Sets TA-312/PT
- TM 11-5805-284-14