Bay Technical Associates none manual Isdn BRI LEDs S/T or U Interfaces, DSU/CSU LEDs

Operating the ARN

ISDN BRI LEDs (S/T or U Interfaces)

Table 3-8 describes the ISDN adapter module LEDs.

Table 3-8.	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 interface detects connection to an external
(Data Detect)		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)

DSU/CSU LEDs

Table 3-9 describes the DSU/CSU adapter module LEDs.

Table 3-9.	DSU/CSU LEDs
LED		Meaning
TxD		Lights when the interface transmits data over the network.
(Transmit Data)
RxD		Lights when the interface receives data from the network.
(Receive Data)
CD		Lights when the interface detects a connection to another
(Carrier Detect)		device.
Test		Lights when the interface is in test or loopback mode.

114200 Rev. A 3-7