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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
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
1
st
segment
30 dB
32 dB
2
nd
and 3
rd
segment
28 dB
28 dB
RANGE LIMITS, PIC Cable, 70°F
Gauge/Segment
Recommended Maximum
26 Gauge, 1
st
segment
10,470 ft.
26 Gauge, 2
nd
and 3
rd
segment
9,865 ft.
1,2
24 Gauge, 1
st
segment
14,770 ft.
24 Gauge, 2
nd
and 3
rd
segment
14,050 ft.
1,2
1
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.
2
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.
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
