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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
5
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.