User Manual
SUPM1
page 37 of 94© KEYMILE December 2015 EN/LZTBU 372 129/1 RC
94
Functional Description
The predefined protocol fixes the CAS bit pattern according to the following
table:
5.2.2 MCAS Loop calling PBX
A loop calling PBX is connected to the SUPM1 unit.
The signalling is identical to the MCAS direct line mode.
5.2.3 MCAS Earth calling PBX
An earth calling PBX is connected to the SUPM1 unit.
The predefined protocol fixes the CAS bit pattern according to the following
table:
5.2.4 MCAS PBX Extension
A standard telephone set is connected to the SUPM1 unit, and a PBX is con-
nected to an exchange side analogue subscriber line service unit.
The predefined protocol fixes the CAS bit pattern according to the following
table:
Table 28: MCAS direct line signalling
CAS bit State
a b c d downstream upstream
0 0 0 1 Disconnect clear -
0 1 0 1 Call established Off-hook
0 1 1 1 Metering pulse -
1 0 0 1 Ringing off -
1 0 1 1 Ringing on -
1 1 0 1 Circuit free (idle) or busy On-hook
1 1 1 1 Blocking (AIS) Blocking (AIS)
Table 29: MCAS earth calling PBX signalling
CAS bit State
a b c d downstream upstream
0 1 0 1 Call established Off-hook or ground key
0 1 1 1 Metering pulse -
1 0 0 1 Ringing off -
1 0 1 1 Ringing on -
1 1 0 1 Circuit free (idle) On-hook
1 1 1 1 Blocking (AIS) or busy Blocking (AIS)
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