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3Com Router 5000 and Router 6000 v2.41
Module Guide
Chapter 4 Flexible Interface Cards (Router 6000)
4-39
, payload,
local or
cell)
Blinking
On
Alarm
detected,
loop back
not set
Off Loop back
not set, no
alarms
detected
Note that following alarms can be indicated by LP/ALM blinking on: LOS, OOF, AIS, RED,
FERF.
Note：if atm interface is shutdown, both LINK/ACT and LP/ALM will be off.
4.12.4 Interface Cable
The interface that the Router 1-Port T3 ATM FIC provides uses two SMB sockets for
data transmitting and receiving respectively. The ports adopt the 75-ohm unbalanced
transmission mode and are connected to the peer device using a pair of 75-ohm
unbalanced coaxial cables as shown in
Figure 4-38. Several cable length options are
available.
Note:
The Router 1-Port T3 ATM FIC and 8.8 Router 1-Port E3 ATM FIC cards use the same type of cables
for connection, which are called E3/T3 cables in this manual.
4.12.5 Connecting the Interface Cable
Caution:
By design, the Router 1-Port T3 ATM FIC is protected against lightning strikes. But when outdoor cabling
is involved, you are recommended to add a special lightning arrester at the input end of the E3/T3 cable
for better protection.