ISDN Interfaces
PRI/BRI Call Monitoring
Strata CTX I&M 10/02
5-33
ISDN Inte
rface
s
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
1
) and the synchronization circuit of the RCTU PCB. The RCTU
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
1
) and closing the synchronization circuit (SS
2
). When this occurs, the digital voice
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.
5439
PDKU
Primary Reference PCB*
Secondary Reference PCB*
Other RDTU, RPTU, or RBSU
CTX
Digital T
ransmission V
oice
P
ath
Synchronization
Circuit
Synchronization
Circuit
Synchronization
Circuit
Digital Voice
Path
Digital Voice
Path
Digital Voice
Path
CTX
Digital
Telephone
Standard
Telephone
SS1
SS2
SS3
Line 1
Line 2
Line 3
Public Switched
Telephone
Network (PSTN)
PRI, BRI, or T1
AT&T or
other provider
PRI, BRI, or T1
Other
PRI, BRI, or T1
provider
Stratum-1
Clock
Source
Processor PCB
Clock not synchronized properly
with Stratum-1 Clock Source
Time
Switch
Clock
Synchronization
Circuit
Clock synchronized properly
with Stratum-1 Clock Source
Other
Clock
Source
RSTU
Summary of Contents for Strata CTX100
Page 16: ...Introduction Related Documents Media xii Strata CTX I M 10 02 ...
Page 94: ...Strata CTX100 Installation Installing the CTX100 Cabinet 2 24 Strata CTX I M 10 02 ...
Page 150: ...Strata CTX670 Installation Remote Expansion Cabinet Unit 3 56 Strata CTX I M 10 02 ...
Page 188: ...PCB Installation Network Requirements 4 38 Strata CTX I M 10 02 ...
Page 238: ...T1 Loop Back Testing 6 12 Strata CTX I M 10 02 ...
Page 310: ...Station Apparatus 2000 series Telephones 8 48 Strata CTX I M 10 02 ...
Page 342: ...Peripheral Installation Station Message Detail Recording SMDR 9 32 Strata CTX I M 10 02 ...