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Operating the ARN
114200-E Rev 00
3-7
ISDN BRI LEDs (S/T or U Interfaces)
Table 3-10
describes the ISDN adapter module LEDs.
56/64K DSU/CSU LEDs
Table 3-11
describes the 56/64K DSU/CSU adapter module LEDs.
Table 3-10. ISDN BRI LEDs
LED Meaning
S/T Interface
Unlabeled LED Lights when the ARN is using the D-channel.
U Interface
D
(D-channel; 16-KB
Management Channel)
Lights when the ARN is using the D-channel.
DD
(Data Detect)
Lights when the ISDN-BRI interface detects connection to an
external device (that is, a switch).
B1
(B-Channel #1; 64-KB
Data Channel)
Lights when the ARN is using B-channel #1.
B2
(B-Channel #2; 64-KB
Data Channel)
Lights when the ARN is using B-channel #2.
Table 3-11. 56/64K DSU/CSU LEDs
LED Meaning
TxD
(Transmit Data)
Lights when the 56/64K DSU/CSU
interface transmits data
over the network.
RxD
(Receive Data)
Lights when the 56/64K DSU/CSU
interface receives data
from the network.
CD
(Carrier Detect)
Lights when the 56/64K DSU/CSU interface detects a
connection to another device.
Test Lights when the 56/64K DSU/CSU interface is in test or
loopback mode.