Figure 1-14. Wire tagging code.
The telephone is no longer limited to use with manual switchboards. It can be attached to
a tone signaling adapter TA-955/PT which turns the telephone into a pushbutton, dial tone, two-wire,
common battery subset capable of producing the standard dual tone signals used by military and
commercial automatic switching systems. (Don't forget the batteries, BA-30 or BA-3030.)
For additional information, see TM 11-5805-201-12.