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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.