Cisco 4G-LTE-ANTM-O-3 Installation Guide Page 144

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the ISDN switch. In Figure 5: Data Line Backup Directly from Router to ISDN Switch, on page 117, the dial
backup link goes directly from the router to the ISDN switch.
Figure 4: Data Line Backup Through CPE Splitter, DSLAM, and CO Splitter
Primary DSL interface,
FE interface (Cisco 881
router)
ACisco 880 series router1
Dial backup and remote
management through the
ISDN interface (ISDN
S/T port); serves as a
failover link when the
primary line goes down
BDSLAM2
ATM aggregator3
ISDN switch4
Provides administrator
with remote management
capability through the
ISDN interface when the
primary DSL link is
down; serves as dial-in
access to allow changes
or updates to Cisco IOS
configuration
CISDN5
ISDN peer router6
Web server7
Administrator8
Cisco 800 Series Integrated Services Routers Software Configuration Guide
116 OL-31704-02
Configuring Backup Data Lines and Remote Management
Configuring Data Line Backup and Remote Management Through the ISDN S/T Port
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