Cisco CISCO2650 - 2650 Router Hardware Installation Manual page 180

ATM T3 and E3 Network Modules
The ATM T3 network module has a sensitive receiver. If you use a short T3 cable, it is possible to
Note
saturate the receiver, leading to bit errors. If this occurs, we recommend one of the following:
•
•
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 Network Module and ATM E3 Network module LEDs
LED
EN
RCLK Green
FERF
OOF
AIS
ATM T3/E3 Network Module LEDs
Table 11-3
Table 11-3 ATM T3/E3 Network Module LEDs
LED
TXCL
RXCL
RXALM
RXCR
Loopback LED Green
Cisco Network Modules Hardware Installation Guide
11-4
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.
Color Meaning
Green Module has passed its self-tests and is available to the router.
Receive clock has been detected.
Yellow Far-end receive failure.
Yellow Out of frame.
Yellow Alarm indication signal.
shows the LEDs for the combined ATM T3/E3 network module.
Color
Green
Green
Yellow
Green
Meaning
Cell transmitted.
Cell received.
Alarm indication signal.
Carrier present.
Loopback
Chapter 11 Connecting ATM Network Modules
Table 11-2.
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