FIELD TELEPHONE SWITCHBOARDS

SB-22A/PT FIELD TELEPHONE SWITCH BOARD It is a manual, portable local battery communications switchboard, readily adaptable for all weather field use or mobile and fixed base military shelter operations. The switchboard has facilities for interconnecting 12 separate voice frequency (VF) circuits. Additionally, the SB-22A has provisions to interconnect local battery telephone circuits, VF teletypewriter circuits and to control remote radio equipment.
· Small, lightweight and durable.
· Essential for all portable telephone switchboard installations.
· Handles up to 12 telephone circuits.
· Tightly-fitting front cover protects from the elements.
· Includes convenient headset microphone.
· Built in accordance with stringent U.S. Military Specifications.
· Can be interconnected with an additional SB-22A for up to 29 VF circuits.
· Equipped for night alarm operation.
· Provisions for conference calling.
· Includes accessory kit MX-2915/PT containing one trunk jack, two line jacks, and spare
signal lamps in carrying case.
· Optional tone signaling adapter (TA-977/PT) available - 16 tone signaling capability, for
interfacing with automatic tactical switching centers. No modifications to switchboard
required.