Cisco IAD2431-16FXS Manual do Utilizador descarregar pdf (Página 9)

Trunk Review

 Analog

– Two-wire or four-wire local loop

– Can be used for a single PBX-to-PSTN voice circuit

 DS-1 (T-1)

– Digital twisted-pair facility operating at 1.544 Mbps

– Time division multiplexed (TDM)

– Carries twenty-four 64 kbps voice channels

 ISDN Primary Rate Interface (PRI)

– DS-1 with ISDN interface

– Twenty-three 64 kbps B-channels for voice and data calls

– One 64 kbps D-channel for signaling only

– Most commonly used for connection to customer PBXs

 SIP trunks

– Trunks used for IP PBX connections to carrier VoIP network using SIP for

call control

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Cisco IAD2431-16FXS Manual do Utilizador Página 9