Specifications

2-36 Cisco 7010 Hardware Installation and Maintenance
Preparing Network Connections
Figure 2-24 Optical Bypass Operation on a DAS
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 MIP Interface Cable Connector
Station 4
Station 3
Station 2
Station 1
BA
B
A
B
A
Optical bypass switch
“normal configuration”
A
B
Station 4
Station 3
Station 2
BA
B
A
B
A
Failed station
Station 1
Optical bypass switch
“bypassed configuration”
Ring does not wrap
A
B
H1863
Pin 1
Pin 9
Pin 11
Pin 3
Pin 1
Pin 9
Pin 11
Pin 3
72-XXXX-01 MIP
T1 or null-modem
connector (typical)
H2385