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Tech Support 800.726.8663
Return for Repair 256.963.8722
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61291004L2-22A
D4 TOTAL REACH DDS (TRDDB)
■
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
■
Check cable for load coils.
■
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.
■
Ensure loop length is within allowable deployment guidelines.
■
Relocate the TROCU-R to splice points sequentially closer to the Total Reach DDB to isolate suspect cable
sections.
Excessive Errors On Loop
■
Ensure background noise does not exceed 34 dBrn.
■
Ensure impulse noise is not greater than –40 dBm (+50 dBrn).
NOTE
: Measure noise with 50 kbit filter.
■
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.
■
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:
■
2-wire DSL loss of signal.
■
Loss of synchronization.
■
Open loop.
■
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.
TESTING
The TRDDB supports the following loopbacks and applications:
■
DS0 latching bidirectional loopback from DS0 test set or remote test center.
■
Remote end initiated loopbacks from TROCU-R.
■
Supports 2-wire loop tests from remote end when DDS-DP is in bidirectional loopback.
■
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.
LBK & Pushbutton Tests
Successful loopback tests will show the following LED indication:
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.
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.
TR
OCU-R
TR
DDB
Data
Pass-Thru
Bidirectional loopback
Pass-Thru Mode
4-Wire
CPE Interface
TR
OCU-R
Push once for Total Reach
DDB Loopback
Local Loop
ASC 9Eh
Loopback
Pushbutton
Bidirectional loopback
(initiated by CO or Test Center)
TRDDB LBK LED - ON
TROCU-R CUST LBK LED - FLASHING
TRDDB
local loop loopback
TROCU-R CUST LBK LED - FLASHING
TRDDB LBK LED - FLASHING
TR
DDB
Test
Set
Test
Set
4-Wire
CPE Interface
TR
OCU-R
Push twice for Total Reach
OCU-R Loopback
Local Loop
ASC 9Eh
Loopback
Pushbutton
ASC 9Eh
TROCU-R
customer loop loopback
TROCU-R CUST LBK LED - ON
TRDDB LBK LED - OFF
TR
DDB
Test
Set
CODE
INPUT
OUTPUT
Power Code (PC)
F
C
Telcommunication Code (TC)
–
X
Installation Code (IC)
A
–
Customer Rate
4-Wire Qualifying Frequency (kHz)
DDS Loss Limit (dB)
2.4
1.2
21
2.4/SC
1.6
23
4.8
2.4
26
4.8/SC
3.2
29
9.6
4.8
33.5
9.6/SC
6.4
37
19.2
9.6
44
19.2/SC
12.8
50
56
28.0
59
56/SC & 64
36.0
61
