PRICING AND AVAILABILITY 800.827.0807
TECH SUPPORT 800.726.8663
RETURN FOR REPAIR 256.963.8722
www.adtran.com
61223424L2-22B
Warranty: ADTRAN will replace or repair this product within the warranty period if it does not meet its published specifications or fails while in service.
Warranty information can be found at www.adtran.com/warranty.
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
1st segment 30 dB 32 dB
2nd and 3rd segment 28 dB 28 dB
RANGE LIMITS, PIC Cable, 70°F
Gauge/Segment Recommended Maximum
26 Gauge, 1st segment 10,470 ft.
26 Gauge, 2nd and 3rd segment 9,865 ft. 1,2
24 Gauge, 1st segment 14,770 ft.
24 Gauge, 2nd and 3rd segment 14,050 ft. 1,2
1In three segment circuits (two H4Rs), individual segment resistance values must be verified. Refer to the Installa-
tion and Maintenance Practice for details and calculations.
2When 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.
No
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
No
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).
No
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
