11-4
Cisco Network Modules Hardware Installation Guide
OL-2485-20
Chapter 11 Connecting ATM Network Modules
ATM T3 and E3 Network Modules
Note
The ATM T3 network module has a sensitive receiver. If you use a short T3 cable, it is possible to
saturate the receiver, leading to bit errors. If this occurs, we recommend one of the following:
•
Reduce the transmit level of the device attached to the T3 network module. Many devices have a line
build-out (LBO) configuration setting for this purpose.
•
Insert a 4-dB attenuator on the receive side of the T3 network module.
Connecting ATM T3 and E3 Ports to the Network
Use a coaxial cable to connect the module BNC port to a T3 or E3 network.
ATM T3 Network Module and ATM E3 Network Module LEDs
The ATM T3 network module and the ATM E3 network module have the LEDs shown in
Table 11-2
.
ATM T3/E3 Network Module LEDs
Table 11-3
shows the LEDs for the combined ATM T3/E3 network module.
Table 11-2
ATM T3 Network Module and ATM E3 Network module LEDs
LED
Color
Meaning
EN
Green
Module has passed its self-tests and is available to the router.
RCLK
Green
Receive clock has been detected.
FERF
Yellow
Far-end receive failure.
OOF
Yellow
Out of frame.
AIS
Yellow
Alarm indication signal.
Table 11-3
ATM T3/E3 Network Module LEDs
LED
Color
Meaning
TXCL
Green
Cell transmitted.
RXCL
Green
Cell received.
RXALM
Yellow
Alarm indication signal.
RXCR
Green
Carrier present.
Loopback LED Green
Loopback