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Maintenance Object Repair Procedures
555-233-123 10-870 Issue 4 May 2002
H323-BCH (H.323 B-Channel)
No maintenance diagnostic tests exist for this object.
H.323 signaling is very similar to ISDN Q.931 signaling. In order to take advantage of
existing DEFINITY ISDN call processing software, H.323 trunk call processing includes
H.323 signaling groups, H.323 D-channels and H.323 B-channels. H.323 Signaling groups
are similar in concept to ISDN PRI signaling groups. H.323 D-channels are an artificial
fabrication created only to allow maximum re-use of system ISDN code. H.323 B-channels
are also an artificial fabrication.
No physical hardware components make up the H.323 B-channel object discussed here.
Along with the D-channel, these objects allow existing ISDN call processing to be re-used for
H.323 trunking. The H.323 signaling group is not a collection of physical D-channels that
exist on one or more DS1 facilities. The H.323 signaling group can be considered to be one
D-channel that physically rides on a C-LAN port and the IP network. Unlike ISDN
D-channels, the H.323 D-channel may actually come up and down on a call-by-call basis. So
the H.323 D-channel is actually a TCP/IP signaling channel. Layer 1 and 2 of this signaling
channel can be monitored by IP PING testing.
Performance in terms of voice latency for a signaling group is monitored by background
measurements being collected by the TN802B Media Processor board.
H.323 B-channels actually use TN802B Media Processor ports to carry the actual bearer.
The TN802B is a service circuit. On a call-by-call basis, any port of a TN802B may be serving
an H.323 station or a H.323 B-channel. Status information may exist for a specific H.323
B-channel, and an H.323 B-channel may be busied out and released, but no maintenance
diagnostic tests will exist for the object.
Errors are logged for craft busyout conditions. The system receives service state updates for
craft-driven busyout/release. Under normal conditions the system automatically places H.323
B-channels into or out of service when it receives an H.323 signaling-group service state
update. Craft busyout drops active calls.
Error Log Entries and Test to Clear Values
Notes:
a. Error Type 18: this error indicates that this specific H323 trunk group
member has been craft busied-out.
Table 10-313. H323-BCH B-Channel Error Log Entries
Error
Type
Aux
Data Associated Test
Alarm
Level
On/Off
Board Service State
18 Any B-channel busied out Warning off OOS