ADTRAN HDSL HTU-C/DDM+ User manual

HTU-C / DDM JOBAID
61246003L2-22B
0003
HTU-C / DDM+
CLEI: T1L3B5BA_ _
HTU-CM
1246003L2
R
S
2
3
2
STATUS
STATUS LEDs
STATUS ●RED Alarm on any HTU-C loops, HRE loops, DSX or DS1 interface
✷FLASHING Signal Quality of 0 or No Sync on at least one loop
●YELLOW Loopbacks active
✷FLASHING In-band loopbacks armed
●GREEN Functioning properly
✷FLASHING ES, SES, or BPV detected at either DSX or DS1 interface
RS-232 DB-9 CONNECTOR
■Used to access the HDSL utilities menu tree via VT100 emulation software such as
terminal, Hyper Terminal – Private Edition and ProComm Plus.
■Provision terminal port as follows:
Data Rate — 9.6 kbps, 19.2 kbps
Asynchronous Data Format — eight data bits, no parity (none), one stop bit
■Hardware Flow Control should be disabled.
■When using a PC with terminal software, be sure to disable any power saving programs.
COMPLIANCE CODES
This product complies with UL 1459, third edition. It is intended to be installed in an
enclosure with an Installation Code (IC) of “B” or “E” and in Restricted Access
Locations only. Input current at maximum load is 0.7 A. Output ratings on the net-
work are maximum 165 mA at -190 Vdc.
WARRANTY
Warranty for Carrier Networks products manufactured by ADTRAN and supplied
under Buyer’s order for use in the U.S. is ten (10) years. For a complete copy of
ADTRAN’s U.S. and Canada Carrier Network Equipment Warranty: [phone],
Document #414.
HARDWARE SWITCHES
SW1
■Rotary switch sets the DSX-1 line build out
0 0 — sets LBO to 0-133 feet
1 133 — sets LBO to 133-266 feet
2 266 — sets LBO to 266-399 feet
3 399 — sets LBO to 399-533 feet
4 533 — sets LBO to 533-655 feet
Note: Positions 5,6 & 7 are not used.
SW2
■Is used to provision the card. Default settings are in bold.
SW2-1 — sets the line code to either AMI or B8ZS
SW2-2 — sets the T1 framing to either Unframed or Framed
Note: Unframed operation ignores the setting of SW2-3.
SW2-3 — sets the T1 framing to either SF or ESF
SW2-4 — Enables or disables the NIU loopback option
SW2-5 — Enables or disables the Loopback Timeout option
Default timeout setting is 20 minutes
Must be enable prior to initiating a loopback
SW3
■Selects the span powering voltage
LV — selects –140 Vdc to span power a single HTU-R or
one HRE and an HTU-R
HV — selects –190 Vdc to span power two HREs and an
HTU-R
For complete Installation and Maintenance: [phone], Document #461. Please have your fax number available.
+
C A U T I O NC A U T I O N !
SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
HANDLING PRECAUTIONS REQUIRED.
Code Input Output
Power Code (PC) F C
Telecommunication Code (TC) – X
Installation Code (IC) A –

INDICATIONS AND PROBABLE CAUSES
Front Panel or Circuit Parameters Indicate Abnormal Operation
Connect a terminal emulator via the RS-232 (DB-9) craft interface on faceplate. The terminal
must be VT100 or compatible and set for 1.2 to 19.2 kbps, 8 data bits, no parity, 1 stop bit. Tap
the space bar to establish communication with the unit. Select “M” from the ADTRAN Screen
and “1” from the HDSL main menu. Verify the following conditions on the Current System
Status Screen:
■Is signal quality fluctuating (graphical meter indicators bouncing up and down)?
■Is LOSS (pulse attenuation) > 30 dB?
■Are there any errors counting on the ES, SES, or UAS registers?
■If signal quality is NOT fluctuating, is it equal on both loops?
■Is the current signal quality indication (uppermost “x” on the meter) more than 1 dB below
the MAX?
■Is the current LOSS reading more than 1 dB below the MAX?
If any of these conditions exist, a cable problem is probable and cable testing should be done to
verify all HDSL deployment guidelines are met. These conditions may also reflect intermittent
cable faults or excessive noise impairments. If intermittent faults or noise impairments are
suspected, select “2” from the HDSL main menu and review the Performance History Screen.
If all of the above conditions are met, as well as the HDSL Deployment Guidelines (noted
below), the circuit should provide quality service and can be released.
Front Panel Indications Under Normal Operation:
STATUS ●Green
Circuit Parameters Under Normal Operation:
LOSS < 35dB
Signal quality of 6 dB or higher, with no fluctuation and equal on both loops
All HDSL Deployment Guidelines are met
HDSL DEPLOYMENT GUIDELINES
■Cable pairs must be non-loaded
■Total bridged tap < 2.5 kft
■No single bridged tap > 2 kft
■196 kHz insertion loss < 35 dB
■Pulse attentuation (loss on HDSL current system status screen) 30 dB
■Maximum loop resistance is 800 Ω
■Impulse noises < 50 dBm as measured using a 50 kHz filter and quite termination
■Wideband noise ≤31 dBm as measured using a 50 kHz filter and quite termination
HDSL TROUBLESHOOTING GUIDE
PRICING AND AVAILABILITY 800.827.0807
TECH SUPPORT 800.726.8663
RETURN FOR REPAIR 256.963.8722
www.adtran.com
61246003L2-22B