HCU (HIGHWAY
CONTROL UNIT)
Function: For turning on and off the time-
sharing switches at LMU, DLU and SGD
according to instructions received
from the CPU.
LINE ADDRESS Lamp
These lamps dispaly the numbers of the stations
using the selected link (T: Transmitting station,
R: Receiving station)
SIGNAL CODE Lamp
These lamps display the code of signal tone
being used by the selected link.
SIGNAL CODE
TONE
0 Calling
1 Privacy/Disconnected
2 Busy
3 Dialing/No-registration
4 Group
paging/Zone
paging
5 All
call
6 Priority/Executive
priority
7 Registration/Call
holding/Mic-off
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