AT&T 7300 series, 7500 series, 7100 series, 2500 series Attendant Lines ⎜ Main Satellite ⎜ Trunks

4. MAIN-SATELLITE/TRIBUTARY (MS/T) NETWORKS THROUGH THE UDP OR MULTIPREMISES PACKAGES

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Main-satellite/tributary (MS/T) networks are arrangements of switches in which one switch is designated as the main, while subtending switches are satellites or tributaries. The main switch is fully functional; each satellite uses the trunks and attendants at the main switch. Tributary switches differ from satellite switches in that they have their own listed directory number (LDN) and may have their own attendant and public network facilities. MS/T users reach other users by dialing their extension numbers. and public network facilities.

ATTENDANT

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LINES ⎜

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LINES ⎜

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SATELLITE

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⎜ TRUNKS

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Figure 4-1.Standalone MS/T Network

MS/T configurations are appropriate when:

∙A single location cannot be served by a single switch due to traffic throughput considerations.

∙It is advantageous for users on different switches to use the same RNX and be able to reach each other by dialing only extension numbers.

∙It is more economical to centralize trunks and attendants than to disperse than across all switches.

∙The switch site suggests that multiple switches be used because of either the organizational structure of the company, or the physical layout of the premises. (For example, the site may consist of several large buildings with limited cabling facilities between them.)

Note that main switches can function as the focal point of a MS/T complex of switches, as well as serve as the access point to tandem switches in electronic tandem network arrangements.

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