Filter
Top Products
DEFINITY ECS Release 8.2 Maintenance for R8.2csi
555-233-119 Issue 1
April 2000
Maintenance for csi systems
1-138Troubleshooting Multimedia Call Handling (MMCH)
1
Specifically, PictureTel System 4000 endpoints seem to be the most sensitive to
instability. The Lucent Technologies Vistium also disconnects fairly infrequently.
Last, the CLI Rembrandt II VP freezes video and waits for framing to be
recovered.
Network Configuration Concerns with
Synchronization
When auditing a network for synchronization, avoid unnecessary hops. Thus, a
switch providing star-configuration synchronization is preferred over a
daisy-chain configuration. Additionally, if there are DEFINITY PBXs that have
EPNs, synchronization should be provided to sub nodes from the same port
network through which the PBX receives its synchronization. Passing
synchronization through the PBX Expansion Interface adds an unnecessary hop
to the path and creates another potential point of failure.
Expansion Interface Duplication
If a customer’s network uses PBX EPNs with duplicated Expansion Interfaces,
scheduled switching of the Expansion Interface links should be disabled on the
PBX via
change system-parameters maintenance
. When scheduled
maintenance runs and switches the links, there is a brief corruption of the data
path. If endpoints have active calls when the switch occurs, this corruption of the
data path causes Px64 handshake problems, which lead to the endpoints losing
video source status, and sometimes disconnecting as described above.
Disabling the EI switching is in the customer’s best interest to prevent the
disruption of the Px64 data stream. The customer will get the same level of alarm
indications and maintenance on the EI links, regardless of the status of
scheduled switching.
PRI D-Channel Backup
A somewhat unlikely source of call stability problems occur where the
translations for PRI D-channel Backup between two non-MCU switches were
incorrect. As an example, on switch A, DS1 1A10 was designated as the primary
source, and on switch B, the corresponding DS1 was designated as the
secondary source. When scheduled maintenance was run on the switch that had
an active standby D-channel, an audit disconnected some calls using the link.
The problem was corrected when the D-channel primary/secondary assignments
matched.
Processor Duplication on the PBX
Do not enable the PI link switch on scheduled maintenance. This can cause link
stability problems on the Accunet Bandwidth Controller (ABC).