Zhone Technologies IMACS Network Device - Manual (Page 61)

Zhone Technologies, Inc. IMACS Product Book, Version 4
March 2001 Page 57
5. BRI Card
The 826xxx line of BRI Cards offers industry standard ISDN BRI “U” or “S/T” Interfaces. Each BRI Card supports
eight BRI “U” Interfaces for long line circuit provisioning, or “S/T” Interface for local provisioning. The BRI
Interface provides two bearer and one data channel over two wires (1 pair). The S/T interface provides the same
functionality over 4-wires (2 pair). In addition to this, each BRI “U” Interface supports 256x Zhone Technologies
NTUs or Adtran 64/1218 NTUs, providing remote NTU management. With the 826361 and 826461 cards available
with host release 5.1.X or above, full NTU management and ISDN switch signaling are supported.
The Basic Rate Interface “U” Interface card offers connectivity to sites located up to 18,000 feet from the integrated
access system. This distance is influenced by factors such as wire gauge, bridge tap and loading patterns as
described in ANSI T1.601-1992 specifications. The BRI cards are equipped with eight “U” interfaces that can carry
one BRI, 2B+D channel. This will give users either two 64 Kbps or one 128 Kbps bearer channels per interface.
The “U” Interface is also provides optional sealing current for maintaining wire pair performance. When used with
IMACS WAN and Server Card options, the BRI card supports two transmission protocols (BRITE for the
826361/826461 models and Zhone Technologies proprietary protocol for 826070/826171 models), facilitating
leased line or IDSL (2B1Q) provisioning, BRI to PRI operation and BRI (data) to Frame Relay/ATM Operation.
Either protocol allows the IMACS to extend the reach of an ISDN PBX hundred of miles away from the location of
the PBX switch as shown in Figure 16. All services are passed to the remote location with no restrictions, enabling
the end user or agent to use all PBX functionality as if they were locally attached to the switch. Management of this
solution is transparent to the PBX programmer. All remote extensions are treated as if they are local connections.
No special programming or management is necessary. For example, if there was an ISDN switch located in San
Francisco, ISDN capabilities could be transparently transported across the network to a remote call center or other
customer in San Ramon. There is no technical limit once connected to the network; service could be as far away as
New York.
ISDN Sw itch
IMACS with
BRITE card
T1
“U”
NT1
“U”
San
Ram on
CO
San Francisco
Central Office
IMACS with
BRITE card
NT1
“U”
T1
ISDN Term inal Extension
ISDN Service Area Extension
18k ft ISDN
Service Lim it
NT1
Figure 16 - IMACS BRI Terminal Extension Application