Specifications

2-16
Reference Guide
Model No.
Running Head
Data Modules and Applications Applications
Figure 2-7. BRI Terminal Extension Application
The BRITE mode supports switched connectivity to ISDN capable switches and D channel
signaling on either a full DS0 or multiplexed 4:1 on a single DS0. The ability to multiplex 4
D channels onto one DS0 allows for more efficient provisioning.
Another application of the BRI card is for leased line, or IDSL (ISDN Digital Subscriber
Loop) as shown in Figure 2-8. This allows for the a DDS type circuit, with 2 * 64 kbps bearer
channels over a single wire pair. The leased circuit can be any standard 2B1Q (U interface)
NTU device that supports “nailed-up” (1 or 2B channels) connections and no D channel
signaling.
Figure 2-8. BRI Card in a Leased Line or IDSL Application
2.4.6.1 BRI Card Models
In both cases, leased line and BRITE, B channels carrying voice traffic on the BRI card can
be compressed through the ADPCM card to extend the user’s resources. The only limitation
on BRI traffic is that NTUs or NT1s must be located less than 18,000 feet from the system unit.
The 8260 BRI “U” Card has software configurable mode operation of LT and NT. It supports
up to eight leased or BRI terminal extension (BRITE) applications. The 8260 does not support
sealing current.
ISDN
Switch
BRI-NT
BRI-U
BRI-ST
NT1
IAD
IAD
T1/E1 carrier
Network
BRI-LT
Leased Line or IDSL (2B1Q)
2B1Q
NTU
DTE
DTE
IAD
IAD
T1/E1 carrier
Network
2B1Q
NTU