ADTRAN Faceplate Indicators, Signal Loss Indication, Total Reach DDS, TRDDS-R Loopback, Status

Table 3. Faceplate Indicators

Indicator	Status	Explanation
	ON	Unit is powered up
	Green	Synchronized with
		TROCU DP
SYNC
	Red	Not synchronized with
		TROCU DP; check for
		continuity, load coils, and
		other abnormal line
		conditions
		Errors occured on the
		incoming data stream
NEAR CRC	ON	during the previous
		second; check for
		abnormal line conditions
		closer to the TRDDS-R
		Errors occured toward the
		Total Reach dataport
FAR CRC	ON	during the previous
		second; check for
		abnormal line conditions
		closer to the CO
	ON	Loopback is activated
		towards network
LBK	Flashing	Bidirectional loopback at
		Total Reach dataport, Data
		Pass-Thru
SC	ON	Secondary Channel
		enabled
64	ON	64 kbps data rate enabled
56	ON	56 kbps data rate enabled
19.2	ON	19.2 kbps data rate
		enabled
9.6	ON	9.6 kbps data rate
		enabled
4.8	ON	4.8 kbps data rate
		enabled
2.4	ON	2.4 kbps data rate enabled

LED	SIGNAL LOSS
	(dB)
SC	0-10
64	10-20	level
56	20-30
19.2	30-40	Signal
9.6	40-50
4.8	50-56
2.4	>56

Signal level indicated during synchronization

Figure 5. Signal Loss Indication

Table 4. TRDDS-R and Total Reach Dataport Loopback Interoperability Matrix

Total Reach DDS	TRDDS-R Loopback
Dataports	Response
1291006L1, L2, L3, L4,
1410105L2, 1425105L2,	NIE
1430105L2, 1433105L1,
1433105L3, 1433105L4
1291006L5 (US West)	OCU and NIE
1433105L2 (US West)

4. TESTING Loopback Testing

Loopback tests can be performed from the CO to verify proper loop and TRDDS-R operation. The TRDDS-R features auto-detection capability to determine the model of Total Reach dataport installed in the central office. This feature allows the TRDDS-R to support multiple loopback applications. See Table 4 for an interoperability matrix of loopback responses supported by the TRDDS-R. The TRDDS-R always provides an NIE latching loopback at all rates. See Table 5 and 6 for latching and alternating loopback sequences. The TRDDS-R supports testing of the two-wire loop from the remote end when the CO unit is performing a bidirectional loopback.

Page 4 Section 61291021L5-5A, Issue 1 61291021L5-5A