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DEFINITY ECS Release 8.2 ATM Installation,
Upgrades, and Administration
555-233-124
Issue 1
April 2000
ATM Switch Feature Interactions
B-11Delay Interactions
B
■ Nonfacility Associated Signaling (NFAS)
■ Off-Premises Station
■ Personal Central Office Line (PCOL)
■ Power Failure Transfer
■ R2-MFC Signaling
■ Recorded Announcement
■ Recorded Telephone Dictation Access
■ Restriction—Miscellaneous Trunk
■ Tr un k Flash
■ Trunk Group Busy/Warning Indication
Delay Interactions
Delays in ATM cell delivery affects the ATM-PNC or ATM-CES features and
functionality listed in Ta b le B -5
.
Additionally, WAN-PNC configurations (more than one ATM switch) require
additional delay considerations:
1. Setting up an SVC through the PNC can be delayed by as much as 7 s,
similar to an ISDN trunk.
2. An SVC request can fail, and this failure may not be received for several
seconds.
3. Paths through the PNC are not free (however, tariffing of these resources is
highly variable).
Table B-5. ATM delay interactions
Feature Description
POTS (plain old telephone
service)
Lets in normal point-to-point calls the terminating side does not ring
until an SVC is established through the WAN.
AAR (Automatic Alternate
Routing)
ARS (Automatic Route
Selection)
Route calls based on the preferred (normally the least expensive)
route available at the time the call is placed.
AAR and ARS Overlap
Sending
Determines that if the call is to be routed to another switch over a
trunk with ISDN overlap sending, the system seizes the outgoing
ISDN trunk and starts sending digits while DEFINITY ECS continues
to collect (receive) the remaining incoming digits.
Continued on next page