Cisco EF4116 User Manual

2-28 Cisco 4000 Series Hardware Installation and Maintenance
Network Connection Considerations
Figure 2-29 Single-Attachment Multimode FDDI Module—End View
Optical Bypass Switch Connections
Both the dual-attachment and single-attachment FDDI modules have an optical bypass switch
connector. An optical bypass switch is a passive optical device powered by the FDDI module. If a
fault in the router occurs, or if power is lost, the optical bypass switch is enabled, and the ring will
be unaffected. The optical bypass switch is automatically enabled if power is lost. In addition, the
system software can enable the optical bypass switch if a problem is detected or if the operator
chooses to take the router out of the ring.
H1401a
PHY-S
FDDI
OPT-BYPASS
Multimode port
Alignment groove
Alignment groove
Optical bypass
switch connector
LED
PHY-S
PHY-S
RING OPT
Mounting
screw locations

Cisco EF4116 Specifications

General

Brand	Cisco
Model	EF4116
Category	Network Router
Language	English