AT&T 2500 series Network Router User Manual


 
4-2 MAIN-SATELLITE/TRIBUTARY (MS/T) NETWORKS THROUGH THE UDP OR MULTIPREMISES PACKAGES
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MS/T CONFIGURATIONS
There are two types of MS/T configurations: main-satellite and main-tributary.
Main-Satellite Configuration
For a main-satellite configuration (see figure 4-1), attendant positions and public network trunks are
typically concentrated at the main switch. Unattended locations are referred to as satellites.
Station/terminal users at the main and satellite may dial each other without the intervening dial tone that
accompanies tandem tie trunk network dialing (see chapter 3). To a caller, the main and the satellite
switches appear to be a single switch with one LDN. That is:
All incoming calls to a satellite are switched through the main over tie trunks.
Outgoing calls from the satellite location use the same tie trunks to access trunks and other facilities at
the main.
This configuration uses 3-, 4-, or 5-digit dialing between the main and satellite switches.
Main-satellite configurations offer the following features:
A single LDN
Shared dialing plans between main and satellite stations/terminals
Public network calling (Direct Inward Dialing [DID]) to satellite stations/terminals through the main
switch
Private network calling (Network Inward Dialing [NID]) to the satellite stations/terminals through the
main switch.