Specifications

Chapter 1 Overview Installation and Operation Manual
1-16 Functional Description DXC-100PSX
Table 1-5. Broadband Switchover Times
Error Type Switchover Time
Missing System Clock 5 seconds
Missing Frame Sync Pulse 5 seconds
Invalid Backplane Timeslot Management 5 seconds
Incorrect Framer Values 1 second
Lost Communications with System Manager 60 seconds
Missing Application Module (Front Card) 20 seconds
Missing Interface Module (Rear Card) 5 seconds
Commanded Switchover <50 milliseconds
Narrowband Redundancy
Narrowband Normal Operation
During normal (non-fault) conditions, narrowband user traffic to and from the
network passes through the latching relays within the DXC-100PSX primary
interface module which directly attaches to the link. If it is not already protecting
another DXC-100 narrowband (D8E1T1) module set within the user defined
narrowband protection, the redundant narrowband (D8E1T1) module set will be
performing self-tests via the looped back path within the DXC-100PSX redundant
interface module. In the event that a fault or failure is detected within the
standby module set and narrowband redundancy will be disabled for the duration
of the fault condition. See
1 Figure 1-13 for an overview of normal operation using
the Narrowband Redundancy Group.