TOA Electronics VM-2120 用户手册
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18.3. Telephone Paging Input Connections
E
C
H
PBX, main telephone device, etc.
Control signal
Audio signal
E C H
When using a single-core shielded
cable, connect the shielded mesh to
both E and C terminals.
cable, connect the shielded mesh to
both E and C terminals.
Telephone line