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RETURN FOR REPAIR 256.963.8722
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61104020L4-22D
D4 U-BR1TE V
TROUBLESHOOTING GUIDE
No Power at the IDSL OCU-R or U-Repeater
■ Ensure U-BR1TE V is supplying necessary voltage to power U-repeater or IDSL OCU-R. Measure
T/R voltage at the frame (ring to GND = -118 to -122 VDC (with no termination), tip to ring = -118
to -122 VDC (with no termination), tip to GND = 0. The U-BR1TE V is not polarity sensitive.
■ If SW6 is in POWER position but voltage not present at downstream unit, check cable continuity.
■ If voltage is measured at the remote unit, replace the remote unit.
■ Neither the IDSL OCU-R nor the U-Repeater invoke a measurable short between tip and ring,
thus cable resistance measurements must be made with a manually applied short.
Power, but No Synchronization
■ ACT LED off - no sync with switch, check switch wiring.
■ ACT LED flashing - sync with switch only, check customer termination.
■ Check cable for load coils.
■ Check cable does not exceed 2 kft bridged tap.
■ Ensure loop length is within deployment guidelines.
Excessive Errors On Loop
■ Check cable does not exceed 2 kft bridged tap.
■ Ensure loop length is within deployment guidelines.
■ Compare resistance of individual conductors. If these are different, high resistance or
intermittent opens may be indicated. A TDR is commonly required to find such faults.
Excessive Errors On Carrier
■ Check channel bank configuration and timing.
■ Check near and far end U-BR1TE configuration.
Trouble Codes
In DDS mode the U-BR1TE V transmits an MOS (9Ah) trouble code towards the network under the
following fault conditions:
■ 2-wire DSL loss of signal.
■ Loss of synchronization.
■ Open loop.
■ The IDSL OCU-R transmits an ASC (9Eh) trouble code towards the network from the customer
premises for similar 4-wire customer interface fault conditions.
■ ASC (9Eh) is transmitted to the network in B1 during loopback conditions initiated by the IDSL
OCU-R.
TESTING
The U-BR1TE V supports the following loopbacks and tests:
■ Embedded operation channel when the D-channel is On (D, B1/B2+D, 2B+D)
■ DS0 DP latching loopback sequences in B1 when D-channel is Off (B1, 2B).
■ eoc remapping of subsequent DS0 DP latching loopbacks to downstream elements.
■ Front panel initiated tests using SW2 for test selection, SW5 for channel selection and pattern
generator, and TEST pushbutton SW4 to initiate the test. Tests include the following:
• Loopback Tests (ADR1 through ADR 6 plus NT1)
• Point-to-Point (CRTX, LPTX)
• Local Loopback (LPBK)
• Local Performance Monitoring via rotary switch and LBK pushbutton.
■ Externally initiated tests via front panel bantam jacks and test set.
■ Remote initiated tests from the CO, test center, or IDSL OCU-R.
LBK & Pushbutton Tests (U-BR1TE must be ADTRAN for Loopback Response from OCU-R.)
Successful loopback tests initiated by the TEST/LBK pushbuttons will show the LED indications
listed and will transmit the trouble codes shown.
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 Networks Equipment Warranty
, P/N 60000087-10, call: (877) 457-5007, faxback
Document 414.
COMPLIANCE REQUIREMENTS
Max input current @ max load = 750 mA @ -48 VDC.
Max output current @ max load = 160 mA @ -137 VDC.
CAUTION: This product for installation in a restricted
access location in a Type B or E enclosure only.
Code Input Output
Power Code (PC) F C
Telecommunication Code (TC) – X
Installation Code A –