ADTRAN TRDDS-R User Manual
TRDDS-R
Total Reach® All Rate DDS Termination Unit
For Outside Plant and Customer Premise
Installation and Maintenance
CONTENTS
1. GENERAL........................................................................... 1
2. OPTIONS ............................................................................ 2
3. INSTALLATION ................................................................ 2
4. TESTING............................................................................. 4
5. DEPLOYMENT GUIDELINES ......................................... 6
6. WARRANTY AND CUSTOMER SERVICE ................... 7
FIGURES
Figure 1. ADTRAN TRDDS-R ............................................. 1
Figure 2. Total Reach DDS Circuit Diagram ........................ 2
Figure 3. TRDDS-R Option Switch....................................... 2
Figure 4. Circuit Card Pin Assignments ................................ 3
Figure 5. Signal Loss Indication ............................................ 4
Figure 6. Total Reach Dataport Bidirectional Loopback
Pass-Thru Mode...................................................... 6
Figure 7. Total Reach Dataport Bidirectional Loopback
Normal Mode.......................................................... 6
TABLES
Table 1. Wiring Connections................................................ 3
Table 2. UL/CUL Telecommunications Codes.................... 3
Table 3. Faceplate Indicators................................................ 4
Table 4. TRDDS-R and Total Reach Dataport Loopback
Interoperability Matrix ........................................... 4
Table 5. Latching Loopback Sequences............................... 5
Table 6. Alternating Loopback Sequences........................... 5
Table 7. Total Reach Dataport Loopbacks........................... 6
Table 8. Cable Type and Temperature Loss Data
@ 13.3 kHz ............................................................. 7
Table 9. TRDDS Insertion Loss Measurements .................. 7
Section 61291021L5-5A
Issue 1, April 1999
CLEI Code # D4OIKTU8 _ _
Custom
Telecom
E190349
SW 1
Figure 1. ADTRAN TRDDS-R
NOTE
The TRDDS-R must be used with an appropriate
Total Reach dataport unit.
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.
TRDDS-R is an auto-rate adaptive digital network
The
interface typically located at the customer premises point-ofdemarcation. The TRDDS-R will deliver a standard fourwire 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 TRDDSR 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.
Page 161291021L5-5A Section 61291021L5-5A, Issue 1
Channel Bank
Customer Premises
T-Carrier
TR
OCU
DP
or Outside Plant
2-Wire Loop
T/R Pair
4-Wire Customer
TRDDS-R
18 kft or -45 dB
Interface
DSU/CSU
Up to
Figure 2. Total Reach DDS Circuit Diagram
Features
• Two-wire deployment
• Repeaterless operation
• Bridged tap tolerant
• Span-powered
• Auto-rate adaption on subrates, 19.2 and 56 kbps
rates, including secondary channel, and 64 kbps
clear channel capability
• LED indicators for Power, SYNC, NEAR/FAR
CRC, Service Rate, and Loopback
• T200 mechanics
• Signal-level indication during synchronization
• Automatic data pass-thru upon detection of
bidirectional central Office (CO) loopback at
power-up
• Extended range on customer interface up to 18 kft
or -45 dB
• Sealing Current of 12 mA on the four-wire
customer interface
With -130 Vdc, ADTRAN’s TRDDS system is in the
A3 Class as specified in Bellcore TR-NWT-001089,
Standard for Electrical Safety for Network
Telecommunications Equipment.
2. OPTIONS
Rate is automatically configured from the Total Reach
dataport unit. Options are selected using the SW1 switch
as illustrated in Figure 3.
When 0 dB (SW1-1) is selected, the unit will transmit a 0
dB AMI signal across the four-wire interface toward the
customer DSU/CSU. When -10 dB is selected, the unit
will transmit a -10 dB AMI signal toward the DSU/CSU.
3. INSTALLATION
C A U T I O N !
SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
HANDLING PRECAUTIONS REQUIRED.
After unpacking the unit, immediately inspect it for
possible shipping damage. If damage is discovered,
file a claim immediately with the carrier, and then
contact ADTRAN Customer and Product Service
(CAPS). See Section 6, Warranty and Customer
Service.
CAUTION
Never install telephone wiring during a
lightning storm.
Never install telephone jacks in wet locations
unless the jack is specifically designed for wet
locations.
Never touch uninsulated telephone wires or
terminals unless the telephone line has been
disconnected at the network interface.
Total Reach dataports normally provide -130
V of span-powering voltage to the TRDDS-R.
Wiring
For indoor applications, the TRDDS-R can be housed
in a standard T400/T200 shelf or the ADTRAN T400/
T200 Single Mount Housing, part number 1212007L1.
The ADTRAN T400/T200 single environmental
housing, part number 1150087L1, is recommended for
outside plant applications. Connections are made using
screwdown terminals on the barrier strip located on the
housing. Frame ground is presented on pins 1, 11, 17,
and 27 to accommodate various T400/T200
mountings. Figure 4 describes the circuit card pinout
and Table 1 shows the wiring connections for the
TRDDS-R for both inside and outside mounting
applications.
O
N
0dB -10dB
1
SW1
Figure 3. TRDDS-R Option Switch
Page 2 61291021L5-5ASection 61291021L5-5A, Issue 1
The unit should be wired as follows:
• 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
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.
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).
TRDDS-R
Frame Ground
11
1
17
27
To
Network
(TT)
41 55
(TR) (DTR)
47 49
15
(DTT)
(DRT)
5
(DRR)
From
Customer
To
Customer
Figure 4. Circuit Card Pin Assignments
Table 1. Wiring Connections
lanimreT
riaP
pirtS
snoitangiseD
morF/oT
RT,TT74,14
004T
niP
rebmuN
84JR
krowteN
oT
RRD,TRD51,58,7
remotsuC
)xR(
morF
TTD,RTD55,942,1
remotsuC
)xT(
Table 2. UL/CUL Telecommunications Codes
TUPNITUPTUO
CIA -
CTX X
CPC C
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.
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
remotsuC
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.
Page 361291021L5-5A Section 61291021L5-5A, Issue 1
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