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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Managing data calls
424Wideband Switching
15
Endpoint applications
An endpoint application is the origination or destination of a wideband call.
Endpoint application can be any number of data applications based on the
customer’s particular needs.
ISDN-PRI terminal adapters
For wideband switching with non-ISDN-PRI equipment, you can use an
ISDN-PRI terminal adapter. ISDN-PRI terminal adapters translate standard ISDN
signaling into a form that can be used by the endpoint application and vice versa.
The terminal adapter also must adhere to the PRI-endpoint boundaries as
administered on the DEFINITY ECS switch when handling both incoming (to the
endpoint) applications and outgoing calls.
Line-side (T1 or E1) ISDN-PRI facility
A line-side ISDN-PRI (T1 or E1) facility is comprised of a group of DS0s (24 for
a T1 facility and 32 for an E1 facility). In this context, these DS0s are also called
channels. T1 facilities have 23 B-channels and a single D-channel. E1 facilities
have 30 B-channels, 1 D-channel, and a framing channel. Data flows
bi-directionally across the facility between the switch and the ISDN-PRI terminal
adapter.
PRI-endpoints
A PRI-endpoint (PE) is a combination of DS0 B-channels on a line-side
ISDN-PRI facility that has been assigned an extension.
A PRI-endpoint can support calls of lower bandwidth. In other words, a PE having
a width 6 (six DS0s) can handle a call of one channel (64 Kbps) up to an including
6 channels. For example, an endpoint application connected to a PE defined as
using B-channels 1 through 6 of an ISDN-PRI facility could originate a call using
B-channels 1, 3, and 5 successfully. If the PE has been administered to use flexible
channel allocation, the algorithm for offering a call to the PE starts from the first
DS0 administered to the PE. Since only one active call is permitted on a PE,
contiguous B-channels always are selected unless one or more B-channels are not
in service.
One facility can support multiple separate and distinct PRI-endpoints (several
extensions) within a single facility. Non-overlapping contiguous sets of DS0s
(B-channels) are associated with each PE.
Universal digital signaling level 1 circuit pack
The UDS1 circuit pack is the interface for line-side and network facilities carrying
wideband calls.