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3Com Router 5000 and Router 6000 v2.41
Module Guide
Chapter 4 Flexible Interface Cards (Router 6000)
4-44
SDH/SONET
Layer
Alarm Type
section layer LOL, LOS, OOF, LOF
line layer LOP, AIS, RDI, REI
path layer AIS, RDI, REI
Note：if atm interface is shutdown, both LINK/ACT and LP/ALM will be off.
4.13.4 Interface Optical Fiber
The Router 1-Port OC-3 ATM MM FIC uses multi-mode optical fiber and the Router
1-Port OC-3 ATM SM FIC/Router 1-Port OC-3 ATM SML FIC uses single-mode optical
fiber. As they all use SC-type fiber-optic connectors, the connectors of the optical
fibers must also be SC-type connectors. You are available with several cable length
options. For more information, refer to the section “
Connecting the Interface Optical
Fiber”.
Warning:
Laser danger: Invisible laser radiation may be emitted from the fiber-optic ports which are connected
with lasers. To protect your eyes against radiation harm, never stare into an open fiber-optic port.
Caution:
The Router 1-Port OC-3 ATM SML FIC provides a long-haul fiber interface. It requires
transmission distance at least longer than 25 km (15.5 in.); otherwise, the interface
cannot receive signals.
The Router 1-Port OC-3 ATM MM FIC must be connected using the multi-mode
optical fiber whereas the Router 1-Port OC-3 ATM SM FIC/ Router 1-Port OC-3
ATM SML FIC must be connected using the single-mode optical fiber.