Lucent Technologies Enterprise Communications Server Comcode 108678723 Manuale Utente Scaricare il pdf (Pagina 105)

DEFINITY ECS Release 8.2 ATM Installation,

Upgrades, and Administration

555-233-124

Issue 1

April 2000

Administering ATM-PNC and ATM-CES

5-7Administering DEFINITY ECS

ATM Circuit Emulation Service (ATM-CES)

ATM Circuit Emulation Service (ATM-CES):

■ Can be administered

— as an ATM-CES direct connect

— through an ATM network using PVCs

Both procedures are in

Table 5-8

, under ‘‘ATM-CES administration

procedure’’ on page 5-12.

■ Uses ATM emulated circuits instead of physical T1/E1 tie-trunks out to the

ATM network.

■ Uses up to 8 signaling groups per TN2305/TN2306 to create virtual

trunking.

■ Uses bearer (B) and signaling (D) channels, similar to ISDN facilities but

does not support nonfacility associated signaling (NFAS).

■ Uses channels inside each signaling group, which appear as if they were

ports on the TN2305/TN2306 circuit pack. Hereafter, these are referred to

as ports.

■ Uses constant bit-rate (CBR) signalling over permanent virtual

connections (PVCs).

■ Has a transparent DEFINITY feature set to other locations through

narrowband QSIG (N-QSIG) or distributed communications system over

ISDN-PRI (DCS+)

NOTE:

Because ATM trunks always appear as ISDN-emulated trunks, they

do not support DCS, only DCS+.

ATM-CES rules

Table 5-5 lists several guidelines for ATM-CES administration.

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Lucent Technologies Enterprise Communications Server Comcode 108678723 Manuale Utente Pagina 105