ADTRAN D4 TRDDB Quick Manual page 2

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The TROCU-R does not invoke a measurable short between tip and ring, thus cable resistance measurements
must be made with a manually applied short.
Power, but No Synchronization
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Check cable for load coils.
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Note signal meter reading on TROCU-R during power up and synchronization process. Refer to "Signal Loss
Indication" on TROCU-R job aid for definitions. Loop loss may be too great for synchronization to occur.
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Ensure loop length is within allowable deployment guidelines.
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Relocate the TROCU-R to splice points sequentially closer to the Total Reach DDB to isolate suspect cable
sections.
Excessive Errors On Loop
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Ensure background noise does not exceed 34 dBrn.
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Ensure impulse noise is not greater than –40 dBm (+50 dBrn).
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Compare resistances of individual conductors. If these are different, high-resistance or intermittent opens may
be indicated. A TDR is commonly required to find such faults.
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Relocate the TROCU-R to splice points sequentially closer to the Total Reach DDB to isolate suspect cable
sections.
Trouble Codes
The TRDDB transmits an alternating MOS 9Ah/ASC 9Eh trouble code towards the network under the following fault
conditions:
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2-wire DSL loss of signal.
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Loss of synchronization.
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Open loop.
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Quality Monitor disconnect.
The TROCU-R transmits an ASC 9Eh trouble code towards the network from the customer premise for similar 4-wire
customer interface fault conditions. (Example: mismatched Total Reach and CSU/DSU data rates.)
INSERTION LOSS MEASUREMENTS
Total Reach Design Limits at Traditional 4-wire Frequencies
The table below is for comparison only. The Total Reach DDS system operates at 13.3 kHz for all customer data rates.
Customer Rate 4-Wire Qualifying Frequency (kHz)
2.4
2.4/SC
4.8
4.8/SC
9.6
9.6/SC
19.2
19.2/SC
56
56/SC & 64
TESTING
The TRDDB supports the following loopbacks and applications:
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DS0 latching bidirectional loopback from DS0 test set or remote test center.
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Remote end initiated loopbacks from TROCU-R.
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Supports 2-wire loop tests from remote end when DDS-DP is in bidirectional loopback.
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All existing Total Reach system loopbacks release in response to 35 DDS loop down TIP bytes, by
pressing the LBK button on the TROCU-R, or via a terminal through the DB-9 on the TR OCU-R.
Refer to loopback diagrams for all LBK pushbutton activated tests.
D4 TOTAL REACH DDS (TRDDB)
NOTE: Measure noise with 50 kbit filter.
DDS Loss Limit (dB)
1.2 21
1.6 23
2.4 26
3.2 29
4.8 33.5
6.4 37
9.6 44
12.8 50
28.0 59
36.0 61
LBK & Pushbutton Tests
Successful loopback tests will show the following LED indication:
TR
Bidirectional loopback
DDB
(initiated by CO or Test Center)
Bidirectional loopback
Pass-Thru Mode
TRDDB
local loop loopback
TR
ASC 9Eh
TR OCU-R
DDB
Loopback
Local Loop
Pushbutton
Push once for Total Reach
DDB Loopback
TROCU-R
customer loop loopback
ASC 9Eh
TR
ASC 9Eh
TR
OCU-R
DDB
Loopback
Local Loop
Pushbutton
Push twice for Total Reach
OCU-R Loopback
Compliance
CAUTION: This product is intended for installation in a restricted access location in a Type B or E
enclosure only.
Normal operation – Loop current will not exceed 22 mA @ -130 Vdc with a maximum power
requirement of 100 mA from -48 Vdc.
CODE INPUT OUTPUT
Power Code (PC) F
Telcommunication Code (TC) –
Installation Code (IC) A
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. Carrier Networks Equipment Warranty state-
ment, call (877) 457-5007, Document #414.
Pricing and Availability 800.827.0807
Tech Support 800.726.8663
Return for Repair 256.963.8722
www.adtran.com
TR
OCU-R
TRDDB LBK LED - ON
Test
Set TROCU-R CUST LBK LED - FLASHING
Data
Pass-Thru
4-Wire
CPE Interface
Test TROCU-R CUST LBK LED - FLASHING
Set
TRDDB LBK LED - FLASHING
4-Wire
CPE Interface
Test TROCU-R CUST LBK LED - ON
Set
TRDDB LBK LED - OFF
C
X
–
61291004L2-22A