Using An Optical Bypass Switch With The Corebuilder 2500 System - 3Com CoreBuilder 2500 Getting Started Manual

A
Concentrator
#1
CoreBuilder™
6000
B
FDDI
dual
ring
Active link
A
Concentrator
#2
CoreBuilder
6000
B
Figure 4-21 Dual Homing a CoreBuilder™ 2500 System
As shown in Figure 4-21, the dual-homed device has
two connections to the primary ring: A-to-M and
B-to-M. When a device has connections using both
the A and B ports, the B precedence rule takes
effect. This rule states that if a connection exists
from both the A and B ports to the M ports, the B
port always takes precedence and becomes the
active link. If the connection using the B port fails,
the A port is automatically triggered to become the
active link.
M M
Standby link set by SMT
configuration policy
M
SAS
server
A A
Dual-homed
node
CoreBuilder
2500
B B
SAS
M
M
M
M
Using an Optical Bypass Switch with the
CoreBuilder 2500 System
Figure 4-22 shows an optical bypass switch
configuration. Here, the fiber optic cables installed
on the optical bypass switch are connected to the
A and B ports of the CoreBuilder system. The
power/control cable is then connected to the
optical bypass interface on the FDDI module. The
FDDI dual ring is attached to the MIC receptacles on
the optical bypass switch.
Optical bypass switch
FDDI
dual
ring
A
MIC
receptacles
B
Figure 4-22 Optical Bypass Switch Configuration
The optional optical bypass switch, available from
3Com, provides A and B MIC connectors and a
power connector.
FDDI Modules 4-21
FDDI module
A
CoreBuilder™
A
2500
system
B
B
Power/control cable