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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-11
Delay 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
Trunk 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 
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.
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