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Nortel Networks 114200-E User Manual

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Operating the ARN
114200-E Rev 00
3-7
 
ISDN BRI LEDs (S/T or U Interfaces)
 describes the ISDN adapter module LEDs.
56/64K DSU/CSU LEDs
 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.