PCMTBM产品概述
Talkback Module. One PCMTBM talkback module
shall be provided per system (including any satellite systems).
The module shall provide for talkback operation in centrallyamplified
zones (only). The module shall provide a power-on
LED, talkback volume control, and talkback switching delay
control. A connector block, using screw terminal connectors
shall be included for paging amplification wiring.