Saturday, May 5, 2007

SS7 - MTP2 (Message Transfer Part 2)

MTP2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
SIO - status indication out of alignment
SIN - status indication normal alignment
SIE - status indication emergency alignment
SIOS - status indication out of service
SIPO - status indication processor outage
SIB - status indication busy


BEC - Basic Error Correction
PCR (Preventive Cyclic Retransmission) Technique
Difference between BEC and PCR
Forced Retransmission
Signaling Link Alignment
Proving Period (T4)
AERM - Alignment Error Rate Monitor
SUERM - Signal Unit Error Rate Monitor
PO - Processor Outage


Link Alignment (Normal and Emergency Alignment)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~







MTP2 Flow Control (SIB - Status Indication Busy)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~




MTP2 Timers
~~~~~~~~~~~~~~~~~~~~~~~
T1
T2
T3
T4
T5 -- sending SIB (80 to 120 ms),
T6 -- remote congestion
T7 -- excessive delay of acknowledgment
T8

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