CANOGA PERKINS 2461 E1 Modem - Manual (Page 11)

EdgeAccess Universal Chassis System
2461 Modem User Manual 1-3
1.1.2 Redundancy
The 2461 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 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 ensure its operability.
1.1.3 Interchangeable Interfaces
A variety of ELIMs and OLIMs provides flexible interface interchangeability.
Figure 4 . BNC , DA-15, and RJ48 ELIMs
Figure 5. An Optical Line Interface Module (OLIM)