DEFINITY ECS Release 8.2 Maintenance for R8.2csi
555-233-119 Issue 1
April 2000
Maintenance for csi systems
1-95Multimedia Call Handling
1
network through which the PBX receives its synchronizatio n. Passing
synchronization through the PBX Expansion Interface ad ds 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 Expansi on Interfaces,
scheduled switc hing of the Expansion Interfac e links should be disab led on the
PBX via change system-parameters maintenance. When scheduled
maintenance runs and switche s the links, there is a brief corrupt ion of the data
path. If endpoints have active calls when the switc h occurs, this corrup tion of the
data path causes Px64 handshake p roblems, which lead to th e endpoints losing
video source status, and s ometimes disconnecting as describ ed above.
Disabling the EI switching is in the customer’s best interest to p revent the
disruption of the Px64 data stream. The customer will g et the same level of alarm
indications and main tenance on the EI links, regardless of the status of
scheduled switc hing.
PRI D-Channel Backup
A somewhat unlikely source of call stab ility problems oc cur where the
translations for PRI D-channel Backup betwee n two non-MCU switches were
incorrect. As an example, on switc h A, DS1 1A10 was designated as the p rimary
source, and on switch B, the corresponding D S1 was designated as the
secondary source. When sched uled maintenance was run on the switc h that had
an active standby D-c hannel, an audit disc onnected some calls us ing the link.
The problem was corrected when the D-channel primary/se condary assignme nts
matched.
Processor Duplication on the PBX
Do not enable the PI link switch on sched uled maintenance. This can c ause link
stability problems on the A ccunet Bandwid th Controller (ABC).
Voice-Activated Switching Problems
Voice-activated switching on the DEFINITY MMCH does not follow the loudest
talker. The MMCH queues all speaking p arties and selects a n ew video
broadcaster (the sec ond-oldest speakin g party) when the old est speaking party
has stopped talking . The new broadcaster will see the last s peaker as its video.
The system can also “learn” ab out the noise coming from an end point to help
prevent false switches, adap ting both to noise level and repetitive sounds suc h
as a fan. This adaptation occ urs over approximately 10 sec onds.
No Switching, Full Motion Video
If a room is excessively noisy, the DEFINITY MMCH may receive sufficient audio
signal to conclud e that there is a speaker present. Use the Status Conferenc e x
form to determine if the MMCH thinks an endp oint is talking. The MMCH sets the
Ts field to t for each endp oint if there is voice energy d etected. This endp oint
may have to mute when nobody at the site is speaking to allow the conference to