Download Field Problems Reported at Workshop on C

S.No.
Problem Detail
Solution/Comments
computes the metered units Since SSP is not disconnecting
the call after expiry of the card value, it is felt that SSP has to
send the meter update information periodically to SCP
whenever a meter pulse is due. This has been confirmed from
the SCSLA observation at OCB TAX It was found that
average number of C7 messages sent first time from SSP was
more than 30 per call (i.e. for every USA call, for every 1.5
seconds, one set of messages may be transmitted) Also,
number of error messages and ''Confusion5 messages from IN
exchanges were found high (NTC in SCSLA & in SARLA).
These error/confusion messages further increase the number
of C7 messages due to retransmission, etc. Due to this large
number of C7 messages transacted, SSP and SCP may be
getting overloaded. This may be the reason for the 'SUM5
getting initialized in IN exchanges or losing of some C7
messages
b)
OCB TAXs are having limitation for the number of C7 STP
message processing This can be seen from the STP threshold
messages. When STP threshold is exceeded, some STP
messages may be lost.
OCB’s Problem to be discussed with TEC.
c)
Due to using large capacity level 1 OCB TAXs (which are
having heavy traffic) like Chennai Haddows Road, Bangalore
Central, Hyderabad, etc for STP working for both mobile
roaming calls & IN calls, these TAXs are getting further
overloaded. Hence, load modification ofC7 equipments like
PUPE and PC are observed frequently daily When the PC
jamming takes place, STP working is affected completely till
the active PC is changed or PC is initialized. Hence, during
PC jamming periods and during PC / PUPE load modification,
SCP may become inaccessible or some STP messages may be
lost
This is OCB issue, while creating the data of STP this may be
taken care at OCB TAX.
d)
When more than one COC is available between two stations
(e.g. IN & TAX, TAX & STP), if proper traffic distribution law
is not used at both ends, only one COC will handle the traffic.
When that COC fails, complete traffic may be affected even if
other COCs are in service.
In C-DOT exchange it is being followed in all s/w versions.
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