Tributary Protection Unit - Eci Telecom XDM-100 General Description Manual

XDM® -100 System Design

4.7 Tributary Protection Unit

The XDM-100 provides hardware protection to the electrical tributary modules with
the Tributary Protection Unit (TPU). The TPU is an expansion shelf plugged on the
top of the XDM-100. Connected to the control and power of the XDM-100 shelf, it
becomes an integral part of the platform.
The TPU accommodates Tributary Protection Modules (TPMs) supporting 1:1 and
1:3 protection schemes per each type of module. Up to four groups of 1:1 protected
electrical modules can be defined. Each TPM is connected to a pair of PIM2_21,
PIM345_3, SIM1_4/E (or SIM1_4/OE in the future) modules by traffic cables. Up
to two groups of 1:3 protected electrical modules can also be provided. Users may
define any combination of 1:1 and 1:3 protection schemes. (For additional details,
see Chapter 7, Physical Description.)
The TPMs include protection-switching relays, which are activated by the active
MXC upon detection of a faulty module. One module is always in standby mode to
protect the active modules. In case of a failure in the active module, the standby
module becomes active and replaces the faulty one in less than two seconds, without
having to disconnect any cables.
417006-2005-013-A02 ECI Telecom Ltd. Proprietary 4-13