GE ML1600 - Manual (Page 145)

CHAPTER 9: PORT MIRRORING AND SETUP PORT SETUP
MULTILINK ML1600 ETHERNET COMMUNICATIONS SWITCH – INSTRUCTION MANUAL 9–11
9.3.5 Link Loss Alert
The GE Multilin Universal Relay (UR) family and the F650 family of relays have redundant
Ethernet ports that allow for automatic switching to their secondary ports when they
detect the primary path is broken. The MultiLink switches can compensate for situations
where only the switch receiver fiber cable is broken. Upon detection of the broken receiver
link, the ML1600 will cease sending link pulses through the relay’s receive fiber cable,
thereby allowing the relay to switch to its secondary path. This feature is available for both
10 Mb and 100 Mb fiber ports.
It is recommended to enable the Link Loss Alert (LLA) feature on ports that are connected
to end devices. LLA should be disabled for switch ports connected in a ring.
The Link Loss Alert feature is enabled by default on 10 MB Fiber Optic ports, and disabled
by default on 100 MB Fiber Optic ports. It can be enabled and disabled via the
lla
parameter in the setport command as follows:
setport port=<port#|list|range> [lla=<enable|disable>]
The Link Loss Alert feature is available for both the 10Mb and 100Mb fiber ports. The
following example illustrates how to enable the link loss alert feature.