10. SB-22/PT and SB-22A/PT manual telephone switchboards
Status: STD-A; NSN: 5805-00-257-3602 (SB-22/PT)
STD-A; NSN: 5805-00-715-6171 (SB-22A/PT)
General Information
The SB-22/PT and the SB-22A/PT are tactical manual switchboards that can be rapidly installed to
provide field facilities for interconnecting 12 local-battery telephone circuits, remote controlled radio
circuits, or voice frequency (VF) teletypewriter circuits. Two SB-22/PTs may be stacked to provide a
29-circuit capability by removing one TA-221/PT (operator's pack) and inserting five TA-222/PTs (line
packs). Replacing a line pack with a trunk pack permits one-way ringdown and one-way automatic
trunk circuits between the SB-22A/PT and any other switchboard with common-battery signaling.
Tone-signaling adapter TA-977/PT provides the operator with a 2-wire pushbutton tone-signaling
capability for interfacing automatic switches without operator intervention.
Technical Characteristics
Type of Operation ................................................................. Manual with local battery
Line Capacity ........................................................................ 12
Signaling (Outgoing) ............................................................ 90 to 100 V AC, 20 Hz
Signaling (Outgoing) w/Adapter ...........................................DTMF
Signaling (Incoming) ............................................................ 90 V AC, 20 Hz
Type of Signal .......................................................................Audible or visual alarm
Power Requirement:
Operator's Talking Circuit .................................................. 3 V DC (two BA-30s)
Night Alarm and Panel Light ..............................................3 V DC (two BA-30s)
Weight ...................................................................................15.4 kg (34 lbs)
1-15
SS 0029
Previous Page
