CCR
CCR:The Call Completion Rate measures the percentage of originated calls successfully completed . The CCR shows directly the congestion in the network and indirectly the fault rate . Switch and transmit the signalling messages depends on the CCR available.
International network,the CCR has following types:-
Answer Bid Ratio (ABR)
Answer Seizure Ration (ASR)
Congestion (CONG)
Answer Seizure Ration (ASR)
Congestion (CONG)
ABR
The ABR is the Ratio of successful calls to originating total international calls .
ASR
The ASR is the ratio of successful calls to incoming total international calls.
CONG
Percentage of calls lost due to congestion in the international call network is known as CONG.
E & M Signal
E & M control signaling which is used for signaling on the basis of per-trunk . An additional pair of circuits,reserved for signaling is employed. The forward signals which corresponds to receive or R-lead of the destination device that is one wire, and the other wire dedicated to the backward signals which represents the transmit or S-lead of the destination device.
R2 Signalling
National and international routes used R2 signaling as per CCITT standard . R2 signaling is fully compelled and the backward signal is transmitted as an acknowledgment to the forward signal. This speed up the interchange of information reducing the call set up time. Satellite circuit are an exception and semi-compelled.
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