Patton electronic 29XX manual Bursty Errored Seconds dsx1FarEndTotalBESs, Configuring Nfas

Access Server Administrators’ Reference Guide 22 • T1/E1 Link

Bursty Errored Seconds (dsx1FarEndTotalBESs)

The number of far-end bursty errored seconds (BESs) encountered by a DS1 interface in the previous 24-hour interval.

Degraded Minutes (dsx1FarEndTotalDMs)

The number of far-end degraded minutes (DMs) encountered by a DS1 interface in the previous 24-hour interval.

Using Non-Facility Associated Signaling (NFAS)

NFAS allows PRIs to be fully utilized by increasing the number of data channels. Now PRIs can have 24 B- channels for data rather than the traditional 23 B-channels for data and a D-channel for signaling.

The telephone company can configure a group of PRIs to share a single D-channel. In that group of PRIs, one PRI will contain a D-channel and 23 B-channels. The other PRIs in the NFAS group will have 24 B-channels. The request for an in-bound call now contains an interface identifier that indicates for which PRI in the NFAS group the call is destined.

The NFAS group cannot span multiple remote access server units. Each RAS must have at least one PRI con- figured with a D-channel.

Configuring NFAS

NFAS only impacts the configuration of the signaling settings. The line interface settings do not change with an NFAS implementation.

Example 1

The RAS hosts 2 NFAS groups, each containing 2 PRIs. WAN 1 will have the PRI with the D channel. WAN 2 will have the second PRI for that group. WANs 3 and 4 will contain the second NFAS group.

Signal setting for each WAN port

	WAN 1	WAN 2	WAN 3	WAN 4
Switch Type	att(2)**	nfsSlave(7)	att(2)**	nfsSlave(7)
Interface ID	0	1	0	1
Primary WAN	1	1	3	3

**The switch type for the primary WAN is set to the flavor of ISDN the switch is configured for. This does not change for an NFAS implementation.

*The Interface ID must match what the central office has designated. The PRI with the D-channel must be configure with an ID of 0. Typically, the other PRIs have interface IDs which are numbered sequentially but the IDs can be any number up to 31.

Far End Line Statistics—Totals 274