Interphase Tech iSPAN 5535 PRI - Manual (Page 104)

Watching ISDN Channels
84 Interphase Corporation
Watching ISDN B Channels
N
OTE
Before establishing a call, you cannot know which ISDN B
channel will be used. Therefore, to be sure to capture call
data, you must activate traces for all the ISDN channels.
ISDN B channels are used to transmit data frames after an
ISDN connection is established. The first few data frames
exchanged between local and remote sites correspond to a
second connection phase to allow the establishment of the
upper layer (for example, the PPP protocol).
1. To activate watching on one ISDN B channel, select
that channel in the configuration panel of the SynWatch
dialog.
To activate watching on all ISDN channels, select the
PRI port related to the adapter (Port #0 or Port #1) in the
configuration panel of the Synwatch dialog.
A list of watch modes appears:
Figure B-3. ISDN B Channel Watch Modes