Pri/Bri Call Monitoring - Toshiba Strara CTX Series Installation And Maintenance Manual

ISDN Interfaces
If the path is not synchronised to the Stratum – 1 clock source, calls connected through that path
experience "slipping" or "jitter" in the digital voice or data path (channels). The unsynchronised
signal produces a clicking or popping sound that is heard by the people connected through this
path or causes data errors on data transmissions.

PRI/BRI Call Monitoring

The Strata CTX ISDN circuit cards provide an RS-232 monitor function that enables you to monitor
the ISDN D-channel call progress layer two and three messages (setup, connect, and release). This data
can be monitored live, saved to a file, and/or printed using a PC with communication software.
The hardware connections and communication parameters for the ISDN monitor port are shown in
Figure 5-21. Once this connection is setup and established, call monitoring data continues to be sent
(on the fly) as PRI and BRI calls are originated or received.
Two sample printouts from the RPTU monitor are provided.
start-up and synchronisation sequences that occur at connection and power on and shows typical ISDN
PRI outgoing call setup and release sequences. BRI monitor data is similar to PRI monitor data.
The communication parameters for all call-monitor jacks are 9600 bps, 7, 1, even.
5-22
Figure 5-22 shows typical ISDN PRI
Strata CTX I&M September 2002