Nortel Networks 114200-E manual Isdn BRI LEDs S/T or U Interfaces, 56/64K DSU/CSU LEDs

Operating the ARN

ISDN BRI LEDs (S/T or U Interfaces)

Table 3-10 describes the ISDN 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		Lights when the ARN is using the D-channel.
(D-channel; 16-KB
Management Channel)
DD		Lights when the ISDN-BRI interface detects connection to an
(Data Detect)		external device (that is, a switch).
B1		Lights when the ARN is using B-channel #1.
(B-Channel #1; 64-KB
Data Channel)
B2		Lights when the ARN is using B-channel #2.
(B-Channel #2; 64-KB
Data Channel)

56/64K DSU/CSU LEDs

Table 3-11 describes the 56/64K DSU/CSU adapter module LEDs.

Table 3-11.	56/64K DSU/CSU LEDs
LED		Meaning
TxD		Lights when the 56/64K DSU/CSU interface transmits data
(Transmit Data)		over the network.
RxD		Lights when the 56/64K DSU/CSU interface receives data
(Receive Data)		from the network.
CD		Lights when the 56/64K DSU/CSU interface detects a
(Carrier Detect)		connection to another device.
Test		Lights when the 56/64K DSU/CSU interface is in test or
		loopback mode.

114200-E Rev 00 3-7