CANOGA PERKINS 2361 T1 Modem - Manual (Page 11)

The EdgeAccess Universal Chassis System
2361 Modem Users Manual 1-3
1.1.2 Redundancy
The 2361 provides two redundancy configuration types. In one type, only two modems are used,
but the fiber between them is duplicated. The other type requires four modems and two complete
fiber paths.
Fiber Path Redundancy: Two pairs of fibers are run between two modems. Only the fiber,
therefore, is redundant. Failure of one fiber pair causes a switchover to the other pair. A special
redundant OLIM is required for Fiber Path Redundancy.
Full Redundancy: The modems and the fiber path are both redundant. A failure in either causes
data to switch over to the alternate path. Bit Error Rate testing is continually passing through the
redundant path, to insure its operability.
1.1.3 Interchangeable Interfaces
A variety of ELIMs and OLIMs provides flexible interface interchangeability.
Figure 4. BNC (E1 Only), DA-15, and RJ-48 ELIMs Figure 5. An Optical Line Interface
Module (OLIM)
1.1.4 Alarms
The Standalone 2361 Modem provides input and output dry alarm relay contacts on the rear
panel. These allow management personnel to collect and route alarm data to an external audio or
visual "shop" alarm, provided by the user.
The 2361 rackmount modem, as a component of the Universal Chassis System (UCS, passes
alarm data to the UCS Chassis Interconnect Module (CIM), where it is routed via dry contact
alarm relays to an external alarm, provided by the user.