ADTRAN T200 HDSL4 User Manual download pdf (Page 2)

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T200 HDSL4 Transceiver Unit, Remote-Local Powered

TROUBLESHOOTING HDSL4

This ADTRAN HDSL4 unit is equipped with troubleshooting-at-a-glance LEDs (identified on the reverse side of

this document) that provide customers with a simple means of identifying the location of certain faults.

Additionally, screens available via the craft interface simplify the trouble isolation process. These screens and their

associated benefits are described below.

Troubleshooting Screen

Available via the Main Menu: provides ADTRAN contact information and access to the Troubleshooting Guidance

and General Information screens.

Troubleshooting Guidance Screens

Available via the Troubleshooting screen: detects and displays errors and/or alarms at any of the monitored inputs

(DSX1, DS1 and HDSL). Guidance on the fault(s) detected includes possible cause(s) and suggested actions,

including those shown below:

General Information Screen

Available via the Troubleshooting screen: a reference page which displays the minimum acceptable signal margin,

maximum attenuation, and other deployment parameters for this HDSL4 circuit.

NOTE: Along with the Troubleshooting screens, the Detailed Status screen and Performance History screen,

available via the craft access terminal, provide both real-time and historical view of this circuit.

For complete deployment guidelines on the HDSL4 circuit, refer to the Installation and Maintenance

Practice referenced on the front page.

DSX-1/DS1:

LOS Loss of signal (Red Alarm) at the DSX-1/DS1

receiver

CLK T1 receive clock is out of range

RAI Remote Alarm Indication (Yellow Alarm)

detected at DSX-1/DS1 receiver

AIS Alarm Indication Signal (Blue Alarm) detected

at DSX-1/DS1 receiver

ERR Errors recorded at DSX-1/DS1 receiver

Facility:

GROUND Ground Fault on span (facility pair grounded)

SHORT Short circuit (or low impedance) between pairs

OPEN Open circuit between facility pairs

DSL:

LOS Loss of HDSL sync

MARG Margin has exceeded the alarm threshold

ATTEN Attenuation has exceeded the alarm threshold

ERR Errors recorded at the HDSL receiver

HIST Performance History of the DSL units

ATTENUATION LIMITS

Recommended Maximum

Segment Upstream Downstream

segment

30 dB 32 dB

and 3

segment

28 dB 28 dB

RANGE LIMITS, PIC Cable, 70°F

Gauge/Segment Recommended Maximum

26 Gauge, 1

segment

10,470 ft.

26 Gauge, 2

and 3

segment 9,865 ft.

1,2

24 Gauge, 1

segment

14,770 ft.

24 Gauge, 2

and 3

segment 14,050 ft.

1,2

In three segment circuits (two H4Rs), individual segment resistance values must be verified. Refer to the Installa-

tion and Maintenance Practice for details and calculations.

When designing a dual H4R loop (three segment), the first segment should have lower DC resistance than the

second segment.

LOOPBACK CONTROL CODES

Pattern Description

Requires

Arming?

1in3 Loop down all units and disarm. No

2in5 Arming Pattern, H4TU-R will loop up if Smartjack LB is enabled. No

3in5 Disarm and loop down all units. Restores LB TMO after D5D6. No

2in6 H4R1 LB to Network. No

3in6 H4R2 LB to Network. No

4in6 H4R1 LB to Customer. No

5in6 H4R2 LB to Customer. No

3in7 H4TU-R LB to Network. No

4in7 H4TU-C LB to Network. No

5in7 H4TU-R LB to Customer. No

6in7 H4TU-C LB to Customer. No

3F1E H4TU-C LB to Customer. No

3F02 H4TU-R LB to Customer. No

3F04 H4R1 LB to Customer. No

3F06 H4R2 LB to Customer. No

3F08 H4R3 LB to Customer No

6767 Disable span powering while present. Yes

9393 Loop down H4TU-C, Repeaters – all loopbacks. Loop down H4TU-R – Cust LB always. Will only

loop down H4TU-R Network LB if NIU is disabled. Does not disarm units if they are armed.

C741 H4R1 loopback pattern. 10 bit error injection. Yes

C742 H4TU-R loopback pattern. 20 bit error injection. Yes

C754 H4R2 loopback pattern. 200 bit error injection. Yes

C743 H4R3 loopback pattern. 30 bit error injection. Yes

D3D3 H4TU-C loop up pattern. 231 bit error injection. Yes

D5D5 Query Loopback Pattern (error injection) - H4TU-C: 231 Errors, H4R1: 10 Errors,

H4R2: 200 Errors, H4R3: 30 errors, H4TU-R: 20 Errors

D5D6 Loopback Timeout Override: Disables LB timeout. Restores original LB timeout when unit is dis-

armed.

Yes

FF48 FDL Arming Pattern (ESF only). Arms all units, H4TU-R will LB to Network if NIU Enabled (if

pattern sources at network).

FF24 FDL Disarm Pattern (ESF only). Loop down and disarm all units No

FF1E H4TU-C LB to Network. Will not loop up H4TU-C if H4TU-C already in LB to Customer. No

FF02 H4TU-R LB to Network. Will not loop up H4TU-R if any unit already in LB to Customer. No

FF04 H4R1 LB to Network. No

FF06 H4R2 LB to Network. No

FF08 H4R3 LB to Network No

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