Section 61291021L5-5A
Issue 1, April 1999
CLEI Code # D4OIKTU8 _ _
TRDDS-R
Total Reach® All Rate DDS Termination Unit
For Outside Plant and Customer Premise
Installation and Maintenance
CONTENTS
1.
2.
3.
4.
5.
GENERAL........................................................................... 1
OPTIONS ............................................................................ 2
INSTALLATION ................................................................ 2
TESTING............................................................................. 4
DEPLOYMENT GUIDELINES ......................................... 6
6.
WARRANTY AND CUSTOMER SERVICE ................... 7
Custom
T
elecom
E190349
FIGURES
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
ADTRAN TRDDS-R ............................................. 1
Total Reach DDS Circuit Diagram ........................ 2
TRDDS-R Option Switch ....................................... 2
Circuit Card Pin Assignments ................................ 3
Signal Loss Indication ............................................ 4
Total Reach Dataport Bidirectional Loopback
Pass-Thru Mode...................................................... 6
Total Reach Dataport Bidirectional Loopback
Figure 7.
Normal Mode .......................................................... 6
TABLES
Table 1.
Table 2.
Table 3.
Table 4.
SW 1
Wiring Connections ................................................ 3
UL/CUL Telecommunications Codes .................... 3
Faceplate Indicators ................................................ 4
TRDDS-R and Total Reach Dataport Loopback
Interoperability Matrix ........................................... 4
Latching Loopback Sequences ............................... 5
Alternating Loopback Sequences........................... 5
Total Reach Dataport Loopbacks ........................... 6
Cable Type and Temperature Loss Data
Figure 1. ADTRAN TRDDS-R
Table 5.
Table 6.
Table 7.
Table 8.
NOTE
@ 13.3 kHz ............................................................. 7
TRDDS Insertion Loss Measurements .................. 7
The TRDDS-R must be used with an appropriate
Total Reach dataport unit.
Table 9.
The TRDDS-R is an auto-rate adaptive digital network
interface typically located at the customer premises point-of-
demarcation. The TRDDS-R will deliver a standard four-
wire DDS signal up to 18 kft beyond the TRDDS-R. Both
customer and network interfaces are equipped with outside
plant lightning protection. The customer interface is capable
of receiving signals attenuated to -45dB at the Nyquist
frequency of four-wire AMI DDS. In addition to
terminating the two-wire extended range signal, the TRDDS-
R functions as a regenerative loopback device supporting
Telco-generated testing. The TRDDS-R unit is available in
T200 mechanics, and may be optioned for 0 or –10 dB output
toward the customer. Figure 2 illustrates the Total Reach
DDS Circuit Diagram.
1. GENERAL
This practice provides installation and maintenance
procedures for the ADTRAN TRDDS-R Total Reach® All
Rate DDS Termination Unit. Figure 1 is an illustration of the
ADTRAN TRDDS-R Unit.
The ADTRAN TRDDS-R is a span-powered termination
unit designed to deliver data rates up to 64 kbps and provide
testing functionality. Used in combination with a Total
Reach dataport unit, the TRDDS-R converts the two-wire
Total Reach signal to the traditional four-wire DDS signal for
presentation to the customer.
Trademarks: Any brand names and product names included in this document are trademarks,
registered trademarks, or trade names of their respective holders.
61291021L5-5A
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The unit should be wired as follows:
Electrical Code Compliance
Table 2 shows the UL/CUL Telecommunications Codes
for the TRDDS-R. The TRDDS-R complies with the
requirements covered under UL 1459 third edition and is
intended to be installed in an enclosure with an
Installation Code (IC) of “B” or “E”. The TRDDS-R is
intended for installation in restricted access locations
only.
• Network pair to terminal strip TT and TR positions
• To Customer and From Customer pairs through
customer 8-pin modular connector
or
To Customer (DRT, DRR) and From Customer
(DTT, DTR) to designated terminal strip positions
No rate selection is necessary for the TRDDS-R. The
unit automatically adapts to the service rate of the Total
Reach dataport in the Central Office (CO).
Table 2. UL/CUL Telecommunications Codes
INPUT
OUTPUT
IC
A
X
-
TC
X
TRDDS-R
PC
C
C
Frame Ground
1
11
27
17
Display Indicators
The TRDDS-R contains faceplate-mounted LED
indicators which display the operating status and service
rate. The indicators are described in Table 3.
(TT)
(TR)
(DTT)
(DTR)
41
47
55
49
From
Customer
To
Network
(DRT)
(DRR)
5
To
Customer
Signal Meter
The TRDDS-R contains a signal meter that approximates
the amount of dB loss on the TRDDS loop at 13.3 kHz
(135 Ω termination), the Nyquist frequency of TRDDS.
The signal meter on the TRDDS-R may be used to verify
that the loop loss is actually within TRDDS deployment
guidelines without the requirement of peripheral test
equipment. The signal meter is activated automatically
upon power up during the TRDDS training sequence and
remains activated until synchronization occurs (usually
30-90 seconds after power-up). For example, if the signal
meter only illuminates the 2.4 LED, then the loop loss is
too great for TRDDS deployment. If the signal meter
illuminates 2.4 and 4.8 (only two LEDs), then the
TRDDS loop loss is between 50 and 56 dB and the loop is
considered marginal for TRDDS deployment. If three or
more rate LEDs are illuminated during TRDDS train-up,
then the circuit is considered to be within TRDDS
deployment guidelines. See Figure 5 for a translation of
the signal meter loss ranges in dB. If the loop loss
indicates a marginal loop for TRDDS deployment, then a
more precise loop loss measurement can be made with the
appropriate test equipment.
15
Figure 4. Circuit Card Pin Assignments
Table 1. Wiring Connections
Terminal
Strip
T400
Pin
Customer
RJ48
Pair
Designations Number
To/From
Network
TT, TR
41, 47
5, 15
To
Customer
(Rx)
DRT, DRR
7, 8
1, 2
From
Customer
(Tx)
DTR, DTT
49, 55
61291021L5-5A
Section 61291021L5-5A, Issue 1
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Table 3. Faceplate Indicators
LED
SIGNAL LOSS
(dB)
Indicator
Status
Explanation
0-10
SC
64
10-20
20-30
30-40
40-50
50-56
>56
ON
Unit is powered up
56
19.2
9.6
4.8
2.4
Green
Synchronized with
TROCU DP
SYNC
Red
Not synchronized with
TROCU DP; check for
continuity, load coils, and
other abnormal line
conditions
Signal level indicated during
synchronization
Errors occured on the
incoming data stream
during the previous
second; check for
abnormal line conditions
closer to the TRDDS-R
Figure 5. Signal Loss Indication
NEAR CRC
FAR CRC
LBK
ON
Table 4. TRDDS-R and Total Reach Dataport
Loopback Interoperability Matrix
Errors occured toward the
Total Reach dataport
during the previous
second; check for
abnormal line conditions
closer to the CO
Total Reach DDS
Dataports
TRDDS-R Loopback
Response
ON
ON
1291006L1, L2, L3, L4,
1410105L2, 1425105L2,
1430105L2, 1433105L1,
1433105L3, 1433105L4
NIE
Loopback is activated
towards network
1291006L5 (US West)
1433105L2 (US West)
OCU and NIE
Flashing Bidirectional loopback at
Total Reach dataport, Data
Pass-Thru
SC
64
ON
Secondary Channel
enabled
4. TESTING
Loopback Testing
ON
64 kbps data rate enabled
Loopback tests can be performed from the CO to verify
proper loop and TRDDS-R operation. The TRDDS-R
features auto-detection capability to determine the model of
Total Reach dataport installed in the central office. This
feature allows the TRDDS-R to support multiple loopback
applications. See Table 4 for an interoperability matrix of
loopback responses supported by the TRDDS-R. The
TRDDS-R always provides an NIE latching loopback at all
rates. See Table 5 and 6 for latching and alternating loopback
sequences. The TRDDS-R supports testing of the two-wire
loop from the remote end when the CO unit is performing a
bidirectional loopback.
56
ON
ON
56 kbps data rate enabled
19.2
19.2 kbps data rate
enabled
9.6
4.8
2.4
ON
ON
ON
9.6 kbps data rate
enabled
4.8 kbps data rate
enabled
2.4 kbps data rate enabled
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Section 61291021L5-5A, Issue 1
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Table 5. Latching Loopback Sequences
Number of
Initiating OCU Latching Loopback to Loop the
TRDDS-R (US West Only)
• SW1-6 on the TRDDS-DP must be ON to enable
latching loopback response.
• From a test system or set, send an OCU latching
Function
Byte Code
Received
Bytes
Clear existing
loopbacks
Transition in
progress (TIP)
*0111010
Minimum of
35 TIP bytes
loopback sequence.
• Send a selected test pattern and test for error-free
operation.
• Upon completion of this test, advance to
Terminating OCU, CSU or NIE Latching
Loopback for latching loopback termination.
Identify device Loopback select
Minimum of
35 LSC bytes
to be looped
code (LSC)
*1010101 - OCU
*0110001 - CSU
*1000001 - NIE
Initiating CSU Latching Loopback to Loop a
DSU/CSU (US West Only)
• SW1-6 on the TRDDS-DP must be ON to enable
Prepare to loop; Loopback enabled Minimum of
latching loopback response.
send MAP code (LBE)
100 LBE
bytes
after 30 bytes
*1010110
• From a test system or set, send a CSU latching
loopback sequence. This instructs the TRDDS-
DP to notify the TRDDS-R of a CSU loopback
request. The TRDDS-R will reverse sealing
current to the DSU/CSU. The DSU/CSU should
loop when reversed sealing current is detected.
Activate
loopback
Far-End voice
(FEV)
Minimum of
32 FEV
bytes
*1011010
Minimum of 35 TIP bytes required to disable
established latching loopback.
• Send a selected test pattern and test for error-free
operation.
*Don't Care bit
• Upon completion of this test, advance to
Terminating OCU, CSU or NIE Latching
Loopback for latching loopback termination.
Network Interface Equipment Latching
Loopback
Table 6. Alternating Loopback Sequences
Function
Received Bytes
The NIE latching loopback method can be used to loop
the TRDDS-R at all rates. This loopback test may
require programming of the loopback select code or
the complete sequence into the test system.
Active loopback
Four consecutive bytes of
specified loopback code
*0101010 - OCU
*0101000 - CSU
*0101100 - DSU
Terminating OCU, CSU or NIE Latching
Loopback
• From a test system or set, send a Latching
Loopback Disable command (35 TIP bytes).
Maintain loopback and Data byte alternating with
test for bit errors
loopback code
example:
*DDDDDD1/*0101010
Total Reach Dataport Bidirectional Loopback
Support
The Total Reach dataport will execute a bidirectional
loopback when performing a loopback at the dataport.
The Total Reach dataport responds to either the OCU
or DS0 loopback command, whichever loopback is
applicable to the dataport version. Refer to Table 7 for
Total Reach dataport loopback support.
Clear loopback
*Don't care bit
Four consecutive data
bytes without a specified
loopback code
61291021L5-5A
Section 61291021L5-5A, Issue 1
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Total Reach
Dataport
Table 7. Total Reach Dataport Loopbacks
TRDDS-R
Total Reach DDS
Dataports
Total Reach DDS
Dataport Loopbacks
X
DSU/CSU
X
Open Loop
1291006L1, L2, L3, L4,
1410105L2, 1425105L2,
1430105L2, 1433105L1
1433105L3, 1433105L4
OCU
DS0
Bidirectional
loopback
Figure 7. Total Reach Dataport Bidirectional
Loopback Normal Mode
1291006L5 (US West)
1433105L2 (US West)
5. DEPLOYMENT GUIDELINES
The TROCU DP and TRDDS-R use technology intended
to eliminate the need for repeaters and concerns over
impairments caused by typical noise and bridged tap.
Listed below are the loop design guidelines for TRDDS
(see Tables 8 and 9 for more information):
If the TRDDS-R detects a bidirectional loopback during
power-up synchronization, the TRDDS-R allows data to pass
on the four-wire interface by entering pass-thru mode. This
permits a standard, portable DDS test set, connected to the
four-wire customer interface of the TRDDS-R, to verify the
integrity of the two-wire loop by transmitting a test pattern
and examining the returning data for synchronization and
errors. The TRDDS-R LBK indicator always flashes during
a Total Reach dataport bidirectional loopback in the pass-thru
mode. Refer to Figure 6 for an illustration of the bidirectional
loopback pass-thru mode.
• All loops must be nonloaded.
• Actual Measured Loss (AML) should not exceed 50
dB at 13.3 kHz (135 Ω termination), the Nyquist
frequency of TRDDS.
NOTE
The 50 dB AML limit includes 6 dB of signal
margin to account for potential near-end cross
talk(NEXT)fromotherdigitalservicesthatmay
be provisioned in the same binder group.
Total Reach
Dataport
TRDDS-R
Test Unit
Data
Pass-Thru
• Loop length should not exceed 50 kft.
• Bridged tap length should not exceed 12 kft.
• Background noise level should not exceed
34 dBrn.
• Impulse noise should not exceed
-40 dBm, (+50 dBrn).
Bidirectional
loopback
Figure 6. Total Reach Dataport Bidirectional
Loopback Pass-Thru Mode
If a Total Reach dataport bidirectional loopback is invoked
after the TRDDS-R achieves synchronization, the TRDDS-R
will not pass or receive data from the CPE or DDS test set.
This is consistent with current DDS testing methods and is
referred to as the Total Reach dataport bidirectional loopback
normal mode. For testing purposes, the installer may choose
to initiate the TRDDS-R to pass-thru mode. Once the
bidirectional loopback is executed in normal mode, unseat
and reseat the TRDDS-R and allow the unit to train-up. Once
trained, the TRDDS-R will revert to pass-thru mode for
further testing. Refer to Figure 7 for TRDDS operation
during bidirectional loopback in normal mode.
NOTE
Measure noise with 50 kbit weighting
characteristic approximating a filter with a
passband of 40 Hz to 30 kHz. Background noise
levelorimpulsenoiselevelisreferencedfrom56/
64 kbps data rate in TR62310.
Page 6
Section 61291021L5-5A, Issue 1
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Table 8. Cable Type and Temperature Loss Data @ 13.3 kHz
PLASTIC CABLE
dB LOSS/kft
PAPER CABLE
dB LOSS/kft
19 Gauge PIC (0F)
19 Gauge PIC (70F)
19 Gauge PIC (120F)
0.5302
0.6083
0.6610
19 Gauge PULP (0F)
19 Gauge PULP (70F)
19 Gauge PULP (120F)
0.5616
0.6415
0.6955
22 Gauge PIC (0F)
22 Gauge PIC (70F)
22 Gauge PIC (120F)
0.912
1.0258
1.1015
22 Gauge PULP (0F)
22 Gauge PULP (70F)
22 Gauge PULP (120F)
0.9454
1.0606
1.1370
24 Gauge PIC (0F)
24 Gauge PIC (70F)
24 Gauge PIC (120F)
1.2571
1.3982
1.4917
24 Gauge PULP (0F)
24 Gauge PULP (70F)
24 Gauge PULP (120F)
1.2900
1.4324
1.5268
26 Gauge PIC (0F)
26 Gauge PIC (70F)
26 Gauge PIC (120F)
1.6823
1.8568
1.9718
26 Gauge PULP (0F)
26 Gauge PULP (70F)
26 Gauge PULP (120F)
1.6751
1.8469
1.9608
Table 9. TRDDS Insertion Loss Measurements 6. WARRANTY AND CUSTOMER SERVICE
ADTRAN will replace or repair this product within 10
years from the date of shipment if it does not meet its
published specifications or fails while in service (see
ADTRAN Carrier Network Equipment Warranty,
Repair, and Return Policy and Procedure, document
60000087-10A).
TRDDS
13.3 kHz compared to 28 kHz for traditional
DDS service
Line
Configuration
@ 13.3 kHz
@ 28 kHz
65.35 dB
62.50 dB
59.33 dB
Contact Customer and Product Service (CAPS) prior to
returning equipment to ADTRAN.
27 kft 26 AWG
36.25 kft 24 AWG
50 kft 22 AWG
50.12 dB
50.00 dB
50.24 dB
For service, CAPS requests, or further information,
contact one of the following numbers:
ADTRAN Technical Support
(800) 726-8663
Standard hours: Monday-Friday, 7 a.m.-7 p.m. CST
Emergency hours: 7 days/week, 24 hours/day
ADTRAN Sales
(800) 827-0807
ADTRAN Repair/CAPS
(256) 963-8722
Repair and Return Address
ADTRAN, Inc.
Customer & Product Service (CAPS) Department
901 Explorer Boulevard
Huntsville, Alabama 35806-2807
61291021L5-5A
Section 61291021L5-5A, Issue 1
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