Pri/Bri Call Monitoring - Toshiba STRATA CTX100 Installation And Maintenance Manual

Digital
Telephone
Standard
Telephone
5439
Figure 5-29 Primary and Secondary References
Figure 5-29 shows the Primary reference PCB. The clock signal from Line 1 passes through the
PCB Software Switch (SS
clock passes the clock source through the time switch and synchronizes the Strata CTX digital
transmission voice or data path.
The Secondary reference is activated if the Primary reference fails. The Strata CTX
automatically switches over to the Secondary reference PCB by opening its synchronization
circuit (SS ) and closing the synchronization circuit (SS
1
or data path of the Strata CTX is synchronized to the Line 2 clock source.
If the path is not synchronized to the Stratum – 1 clock source, calls connected through that
path experience "slipping" or "jitter" in the digital voice or data path (channels). Figure 14-7
shows an unsynchronized signal from Line 3. The unsynchronized 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.
Strata CTX I&M 10/02
CTX
Processor PCB
Synchronization
Circuit
Time
Switch
Clock
Primary Reference PCB*
PDKU
Synchronization
Circuit
SS 1
Digital Voice
Path
RSTU
Secondary Reference PCB*
Synchronization
Circuit
SS 2
Digital Voice
Path
Other RDTU, RPTU, or RBSU
Synchronization
Circuit
SS 3
Digital Voice
Path
) and the synchronization circuit of the RCTU PCB. The RCTU
1
Public Switched
Line 1
Telephone
Network (PSTN)
PRI, BRI, or T1
AT&T or
Line 2
other provider
PRI, BRI, or T1
Clock synchronized properly
with Stratum-1 Clock Source
Line 3
Other
PRI, BRI, or T1
provider
Clock not synchronized properly
with Stratum-1 Clock Source
). When this occurs, the digital voice
2
ISDN Interfaces
PRI/BRI Call Monitoring
Stratum-1
Clock
Source
Other
Clock
Source
5-33