
B-2 Cisco 2524 and Cisco 2525 Router User Guide
Router chassis Ethernet link
(Cisco 2524)
2
On The router senses the Ethernet 10BaseT link integrity
signal, indicating normal operation.
Off The router is not sensing the Ethernet 10BaseT link
integrity signal. Check the Ethernet 10BaseT cable
connection.
In-ring
(Cisco 2525)
On The router has been successfully inserted into the
Token Ring, indicating normal operation.
Off The router has not been successfully inserted into the
Token Ring. Check the Token Ring cable connection.
2-wire switched 56-kbps,
4-wire 56/64-kbps, and
factional T1/T1 WAN
DSU/CSU modules
RX On Data is being received at the DTE interface.
TX On Data is transmitting from the DTE interface.
CD (Carrier) On The DSU/CSU in the module is communicating with
another DSU/CSU.
Loopback On The DSU/CSU is in loopback mode.
Alarm On An alarm condition is present.
Serial module Activity (serial
activity)
Flickering The serial WAN connection is transmitting and
receiving data normally.
Off The serial WAN connection is not transmitting or
receiving data. Check the serial cable connection.
ISDN BRI module Activity (ISDN
BRI activity)
Flickering The ISDN BRI WAN connection is transmitting and
receiving data normally.
Off The ISDN BRI WAN connection is not transmitting or
receiving data. Check the BRI cable connection.
ISDN BRI with integrated
NT1 module
ACT (ISDN
BRI activity)
Flickering The ISDN BRI (with integrated NT1) WAN
connection is transmitting and receiving data
normally.
NT1 On The router detects the ISDN link integrity signal at the
U interface
3
and the internal S/T interface
4
, indicating
that an ISDN connection has been established.
Chassis/Module LED State Description
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