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DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Routine Maintenance Procedures
Page 5-69Install DS1 CPE Loopback Jack (T1 Only)
5
endpoint the column that indicates Rate Adapt shows an n if the endpoint did
not follow the procedures as specified by the H.221. If an endpoint shows y, it
did successfully rate adapt. If an endpoint shows c, it joined the conference at
56kbps.
Once the conference rate adapts, the endpoints that do not properly follow suit,
will become audio-only endpoints. A conference will not rate adapt from 56 kbps
back to 64 kbps until all endpoints disconnect from the conference and it idles.
The PictureTel 1000 Release 1.1C, PictureTel 6.01 software, and the Vistium 2.0
software successfully rate adapt with the MCU. External rate adaptation
techniques used by VTEL and CLI are known to cause problems with the
endpoint when used with this feature.
Endpoint or I-MUX in Loopback Mode
Some endpoints have a loopback enable feature. This makes DEFINITY MMCH
data loopback at the MMCH when a connection is in progress. The loopback can
be enabled prior to or during a connection.
The MMCH does not detect the loop and continues to VAS. In most scenarios,
the switch occurs, but within a few seconds, the broadcaster’s return video
becomes its own image. Once the broadcaster stops speaking, the system
“false” switches to an apparently random port that was not speaking.
Install DS1 CPE Loopback Jack (T1
Only)
Using the DS1 CPE Loopback Jack (apparatus code 700A, comcode
107988867), a technician can test the DS1 span between the system and the
network interface point. The loopback jack is required when DC power appears
at the interface to the ICSU.
The loopback jack isolates the ICSU from the DC
power and properly loops the DC span power
.
NOTE:
The loopback jack operates with any vintage of TN767E (or later) or
TN464F (or later) DS1 circuit packs and with G3V3 EDI release 3 (or later)
software. The loopback jack operates with the 120A2 (or later) Integrated
Channel Service Unit (ICSU) only;
not
the 31xx series of Channel Service
Units or other external CSUs or earlier ICSUs.