Lucent Technologies Comcode 108678723 manual ATM Circuit Emulation Service ATM-CES, ATM-CES rules

DEFINITY ECS Release 8.2 ATM Installation,	Issue 1
Upgrades, and Administration 555-233-124	April 2000

5Administering ATM-PNC and ATM-CES

Administering DEFINITY ECS 5-7

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.