Nortel BCM 3.7, Manual

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Using SL-1 with MCDN to network with a Meridian system 541
Programming Operations Guide
An example of a private network with Meridian 1
The following figure shows a private network composed of one central Meridian 1, and two sites
with Business Communications Manager systems all connected by SL-1, with MCDN activated on
all sites. This example uses a coordinated dialing plan (CDP). The DNs consist of four digits. The
first digit is a destination code which is specific to each system. The last three digits are unique to
each telephone within that system. Refer to
Chapter 11, “Controlling access into the system,” on
page 293 for a description of the dialing plans available to private networks.
Figure 188 MCDN networking, with a common public network connection
This example could represent a large head office (the Meridian 1) connected to several smaller
branch offices (the two Business Communications Managers). In this network, only the head
office has trunks connected to the public network.
The branch offices access the public network via the PRI to the head office. This configuration
allows for cost savings by consolidating the public access trunks. Users at all three locations
access the public network by dialing 9, followed by the public number. For example, a user in the
West End branch might dial 9-555-1212 (for a local call) or 9-1-613-555-1212 (for a long distance
call). These public calls are routed to the Meridian 1 by the Business Communications Manager
routing table. Routing tables at the Meridian 1 will then select an appropriate public facility for the
call.
Network # 2221
Received # 2221
Internal # 2221 Network # 6221
Received # 6221
Internal # 6221
Business Communications
Manager
West-end branch
PNI= 1
Business Communications
Manager
East-end branch
PNI=2
Central
Office
Meridian M1
PRI (public protocol)
PRI (SL-1) PRI (SL-1)
DN: 4221
Voice Mail or
Auto Attendant