Meridian Cabinet Remote Unit (Mcru) - Nortel SL-100 Product Manual

80 Meridian SL-100 remote units
There are two ways to exit ESA:
1. Fast Cold Exit - All calls are dropped and new calls can be established
2. Warm Exit - Established calls are not dropped, but the time to establish
Calls in the process of being established are dropped during ESA entry
and exit.
During ESA, calls to subscribers outside the remote site receive overflow
tone. Emergency and operator calls are routed to specified lines in the
remote. Requests for special features are ignored or receive reorder tone.
Calls to subscribers within the remote site from outside receive reorder
or busy tone.

Meridian Cabinet Remote Unit (MCRU)

The MCRU serves as an interface between remotely-located subscriber
lines and the Meridian SL-100 host. The MCRU is connected to the host
either directly through DS1 links, or through a Meridian Cabinet Remote
Module-Second series (MCRM-S) connected to the host.
Each MCRU supports up to 640 lines (depending on traffic), providing the
same line quality as the Meridian SL-100 host. The MCRU provides an
interface for the following types of equipment:
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These devices connect to the MCRU by plug-in line circuit cards. Each
telephone set or data device has its own line card in the MCRU. This allows
replacement of a faulty card without interruption of service to another line.
The MCRU sends control data and digitized voice information from the
subscriber to the Line Group Controller (LGC) at the host site.
The MCRU supports Emergency Stand Alone (ESA). If the link between
the host and the MCRU is interrupted, telephone calls which originate and
terminate within the MCRU will be completed; however, calls to or from the
host are not possible.
Copyright © 2006, Nortel Networks
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in approximately one minute.
new calls is extended by two to four minutes.
500/2500-type telephone sets
Electronic Telephone Sets (ETS)
Low-Speed Data Units (LSDU)
High-Speed Data Units (HSDU)
Note: For sites with MSL15 or above, the requirement for sites with
software load MSL15 is the Global ESA processor card (NTMX45AA)
for Meridian SL-100 single cabinet MCRU/RLCMs. It provides the
Emergency Standalone (ESA) capability in the event that host-to-remote
Communication Server 2100
Meridian SL-100 Product Guide
555-4001-103 20.01 Standard
SE09 20 October 2006
Nortel Networks Confidential