Multichannel (Mip) Connection Equipment - Cisco 7000 Series Hardware Installation And Maintenance Manual

Preparing Network Connections
Figure 2-24
Station 4
Another technique for fault tolerance is dual homing, whereby critical devices are attached to two
concentrators. Only the designated primary concentrator is active unless it (or its link) fails. If the
primary does fail, the backup (passive) concentrator is activated automatically and sustains the ring.

MultiChannel (MIP) Connection Equipment

The MIP T1 interface cable has two 15-pin DB connectors at each end to connect the MIP with the
external CSU. Figure 2-25 shows the MIP interface cable, connectors and pin-outs.
Figure 2-25
2-36 Cisco 7010 Hardware Installation and Maintenance
Optical Bypass Operation on a DAS
Station 1
A B
A
B
A B
Station 3
MIP Interface Cable Connector
in 1
in 9
in 11
in 3
Optical bypass switch
Normal configuration
Station 4
Station 2
A
B
Station 1
Failed station
B A
Optical bypass switch
Bypassed configuration
Ring does not wrap
A
B
A B
Station 3
Pin 3
Pin 11
Pin 9
Pin 1
T1 or null-modem
connector (typical)
Station 2
A
B