Isdn Adapter Option; Isdn Backup; Figure 2-2 Typical Backup Configuration - Zhone 100 User Manual

2 Description
ISDN Adapter
Option

ISDN Backup

IP M an a ge m en t
N e tw o rk
W ork S tatio n
2-2
The NetPath 100 can be factory-optioned to include an integral ISDN Adapter module.
The ISDN adapter includes four "U" ISDN TA Interfaces with two integral NT1 In-
verse Multiplexers, thereby providing up to 512 Kbps of switched connectivity for net-
work Backup and/or additional Bandwidth On-Demand.
Backup in Frame Relay Protocol utilizing the Router's Primary Port can be via dedi-
cated PVCs on an alternate port, or the frame switch manager may reroute the original
PVCs to the Backup Frame Switch. It is also possible to bypass the entire Frame Relay
Network and initiate backup to a pool of ports on an alternate Frame Switch connected
directly to another Router.
A typical network configuration showing the backup connection to a Backup Frame
Switch using rerouted PVCs is shown in Figure 2-2.
F /S C o n tro l
N P 10 0 D ata
F ram e
& C o ntrol
B a ck b on e
F ram e
S w itc h
P rim ary N o de
M u ltip le xe r
B a ck u p
F ram e
S w itc h
C o ntrol
F /S & IM u x C on trol
B a ck u p N o d e

Figure 2-2 Typical Backup Configuration

The backup process is described as follows:
•
NetPath 100 detects loss of connectivity at CSU.
•
ISDN Adapter card calls Backup Frame Switch and is identified by caller ID.
•
Frame Switch Manager either reroutes original PVCs, or Frame Switch uses
alternate PVCs for the backup connection.
•
NetPath 100 switches the data path when connected.
•
Associated routers determine that PVCs have been established through LMI
enquiries.
•
Communication is resumed.
NetPath 100 User's Manual - Installation Guide
N P 10 0 D ata
& C o ntrol
IS D N
In ve rs e
V .35
C S U
D a ta
O n
IS D N
R outer
D e m an d
N e tP a th 1 00
C u sto m e r L oc atio n
980-001-0210G
June 1999