ADTRAN Total Reach DDS-DP 5 Series Instruction Manual

1
61433105L1-5F Section 61433105L1, Issue 6
1. GENERAL
This practice provides installation and maintenance
procedures for the ADTRAN Series 5 Total Reach
DDS-DP All-Rate DDS Dataport. Figure 1 is an
illustration of the ADTRAN Series 5 Total Reach
DDS-DP, P/N 1 33105L1.
Revision History
This document has been revised to incorporate the
response to the loopback pushbutton function of the
DDS-R ACE remote unit, and add reference to false
latching loopback prevention at 6 kbps.
Description
The ADTRAN Series 5 Total Reach DDS-DP is a
functional replacement for the SLC® Series 5 OCU
DP, CLEI 5SCU 8, delivering data at rates up to 6
kbps using a single copper pair. Used in combination
with the DDS-R termination unit, the Series 5
Series 5 Total Reach®DDS-DP
Total Reach All-Rate DDS Dataport
Installation and Maintenance
Section 61433105L1-5F
Issue 6, June 2002
CLEI Code: 5SC53X4F_ _
Trademarks: Any brand names and product names included in this document are trademarks,
registered trademarks, or trade names of their respective holders.
DDS-DP can accommodate extended loop lengths,
eliminating the need for DDS repeaters. The Series 5
DDS-DP span powers the DDS-R located at the
customer premises. The DDS-R converts the 2-wire
signal to the traditional -wire Alternate Mark
Inversion (AMI) signal for presentation to the
customer.
The DDS-DP occupies a single channel position in the
AT&T® SLC Series 5 or Series 5 compatible channel
bank. It provides the interface between a DS0 time
slot of the T-carrier data stream and the 2-wire
metallic loop extending to the customer premises. The
Series 5 Total Reach DDS-DP will interoperate over
the carrier system with another DDS-DP, OCU DP,
DS0 DP, 1/0 DCS, or switch and can be located in an
end office, hub office, intermediate office, or Digital
Loop Carrier (Figure 2). The 2-wire loop is
connected using the odd pair Tip (pin 31) and Ring
(pin 32) on the Series 5 backplane.
NOTE
The Series 5 Total Reach DDS-DP must be used
with an appropriate DDS-R unit.
CONTENTS
1. GENERAL.......................................................... 1
2. OPTIONS ........................................................... 2
3. INSTALLATION ............................................... 3
4. TESTING............................................................ 4
5. DEPLOYMENT GUIDELINES ........................ 5
6. MAINTENANCE ............................................... 6
7. WARRANTY AND CUSTOMER SERVICE ... 6
FIGURES
Figure 1. Series 5 Total Reach DDS-DP ................. 1
Figure 2. Total Reach DDS Circuit Diagram .......... 2
Figure 3. Option Switch .......................................... 2
Figure 4. OCU Loopback at the DDS-DP ............... 4
Figure 5. DDS-DP Bidirectional Loopback ............ 4
Figure 6. DDS-DP Response to DDS-R ACE
LBK Button .............................................. 5
TABLES
Table 1. Option Settings ......................................... 2
Table 2. Compliance Codes ................................... 3
Table 3. LED Indication ......................................... 4
Table 4. Cable Type and Temperature Loss
[email protected] kHz ........................................ 5
Table 5. DDS Insertion Loss Measurements ....... 5
Figure 1. Series 5 Total Reach DDS-DP
1433105
SYNC
SX
FE
CRC
NE
DSU
QM
LBK
MAN
SW2
DDS-DP

261433105L1-5F Section 61433105L1, Issue 6
Features
• 2-wire deployment
• Repeaterless operation
• Bridged tap tolerant
• Span power for remote DDS-R termination unit
• Utilization in SLC Series 5 channel bank
• Loop Quality Monitor and A/B signaling options
• Bidirectional OCU loopback capability
• False latching loopback prevention at 6 kbps
• Response to remote end initiated loopback
2. OPTIONS
The Series 5 DDS-DP is provisioned through the SLC
Series 5 system and circuit board DIP switch SW2.
This arrangement provides feature options not
available through the SLC Series 5 channel bank
intelligent system. Use the SLC Series 5 Craft
Interface Unit (CIU) to provision intelligent channel
bank features supported by the Series 5 Total Reach
DDS-DP. See Figure 3 and Table 1 for option
description and provisioning.
NOTE
Select OCU DP, CLEI 5SCU 8, when
provisioning via the CIU.
Error Correction
When Error Correction is enabled, the DDS-DP
provides an error detection and correction capability
that maintains data integrity across the carrier facility.
Figure 3. Option Switch
SW2
64K
19.2K
SW56
ABSIG
QM
1
ON
2345
For subrate and 19.2 kbps rates, error correction and
data transmission is accomplished over a single DS0
time slot using a Majority Vote Error Correction
(MVEC) algorithm. For error correction at these
rates, MVEC must be selected in the BCU via the
SLC Series 5 CIU.
For rates of 56 and 6 kbps, error correction requires
one additional DS0 time slot for the error correcting
parity byte. The DDS-DP only allows SCEC, the
parity byte error correction scheme, at 56 and 6 kbps.
When error correction is desired for 19.2 kbps service,
provision 9.6 kbps and MVEC via the CIU and select
19.2K on SW2.
Table 1. Option Settings
Figure 2. Total Reach DDS Circuit Diagram
T-Carrier
SLC
SERIES 5
DLC
2-Wire Loop
4-Wire Customer
Interface
DSU/CSU
DDS-R
DDS-DP
T/R Pair
Customer Premises
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3
61433105L1-5F Section 61433105L1, Issue 6
C A U T I O N
C A U T I O N
!
SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
HANDLING PRECAUTIONS REQUIRED.
Latching Loopbacks
Latching loopbacks are always enabled on the SLC
series 5 Total Reach DDS-DP.
False Latching Loopbacks Immunity
ADTRAN’s protected Loopback family of channel
unites includes an algorithm compatible with SARTS,
Hekimian, TPI, and other test systems that virtually
eliminates false latching loopbacks. Immunity is
automatically enabled at 6 kbps.
3. INSTALLATION
After unpacking the unit, inspect it for damage. If
damage is discovered, file a claim with the carrier,
then contact ADTRAN. Refer to Warranty and
Customer Service.
Compliance
CAUTION
This product is intended for installation in a
restricted access location in a Type B or E
enclosure only.
Max input current @ max load = 165 mA @ - 8
VDC.
Max output current @ max load = 1 mA @ -1 0
VDC. See Table 2 for Compliance Codes.
Tip/Ring Pair
The DDS-DP plugs directly into a SLC Series 5
channel bank. No special wiring is required. The
2-wire loop uses the T/R (Tip and Ring) of the odd
pair, pins 31 and 32 of the SLC Series 5 backplane.
The DDS-R is not polarity sensitive, therefore the unit
will operate even when the T/R pair is reversed.
Zero Code
When Zero Code is enabled, the DDS-DP allows DS0
bytes of all zeros to enter the T-carrier data stream.
On Alternate Mark Inversion (AMI) facilities, this
function should be disabled. B8ZS carrier facilities
that accommodate 6 kbps clear channel operation do
not require the zero code to be suppressed, therefore
zero code is automatically enabled when the 6 kbps
rate has been selected.
Rate Selection
When 6 K (SW2-1) is ON, the DDS-DP operates at
6 kbps clear channel.
When 19.2K (SW2-2) is ON, the DDS-DP operates at
19.2 kbps.
When SW56 (SW2-3) is ON, the DDS-DP enables
Switched-56 operation.
NOTE
Only one rate should be selected. Service rates
of 6 kbps, 19.2 kbps, and Switched-56 are not
supported by the SLC Series 5 BCU. These
operating modes must be provisioned by enabling
switches on SW2. A manual rate setting overrides
BCU rate settings. The DDS-DP does not
support 38. kbps.
A/B Signaling
When A/B Signaling (SW2- ) is OFF, the unit derives
signaling from the incoming data stream. When A/B
Signaling is ON, the unit determines the state of the A
and B signaling bits using signals present on the
backplane of the channel bank. This method assumes
that proper signaling has been maintained throughout
network tandems and cross-connect systems.
NOTE
A/B Signaling option is only applicable when
SW56 is selected; otherwise it is a “don’t care.”
Quality Monitor
When Quality Monitor (SW2-5) is ON, the DDS-DP
monitors the incoming 2-wire loop and -wire
customer interface data for errors. If excessive errors
are detected, the unit blocks the customer’s data
transmission and sends Abnormal Station Code to the
network. Customer data transmission is automatically
restored when the trouble condition is cleared.
Code Input Output
Power Code (PC) F C
Telecommunication Code (TC) – X
Installation Code (IC) A –
Table 2. Compliance Codes

461433105L1-5F Section 61433105L1, Issue 6
Span Power
Span powering is accomplished using -130 VDC
measured from Tip to Ring. Voltage measured from
Tip to GND should be -130 VDC or less depending on
voltmeter impedance. Voltage from Ring to GND
should indicate approximately 0 V.
Synchronization and LED Indication
The DDS-DP and DDS-R typically require 30 to 90
seconds to achieve synchronization. Once
synchronized, the SYNC LOSS indicator LED will
turn OFF. If synchronization cannot be achieved,
check the T/R pair for open or short circuit conditions
or load coils. See Table 3 for LED indications.
Figure 5. DDS-DP Bidirectional Loopback
Test
Unit
DDS-R
Series 5
DDS-DP
Data
Pass-Through
Bidirectional
loopback
Figure 4. OCU Loopback at the DDS-DP
Series 5
DDS-DP
OCU
Bidirectional
loopback
Customer
Intra-office
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4. TESTING
Testing for the DDS-DP is accomplished using the
same test procedures for -wire OCU and OCU DP
units.
NOTE
If 6 kbps is selected, the unit will only respond to
latching loopback sequences. Alternating
sequences are not valid at this rate.
DDS DP Bidirectional Loopback Support
The DDS DP will execute a bidirectional loopback
when performing an OCU loopback at the DDS-DP as
shown in Figure 4. During a bidirectional loopback
the DDS-R enables test data to pass through the
-wire interface to the customer premises. This
allows a standard portable test set at the customer
premises to verify the integrity of both the -wire and
2-wire loops by transmitting a test pattern to the DDS
DP and examining the returning data for
synchronization and errors. A bidirectional loopback
and pass through is shown in Figure 5. During a
bidirectional loopback initiated at the DDS DP the
DDS-R LBK LED will flash. Refer to remote unit
documentation for LED descriptions.

5
61433105L1-5F Section 61433105L1, Issue 6
Loopback Pushbutton (Remote Unit)
The DDS-DP initiates a loopback in response to a
remote unit with a loopback pushbutton feature,
Figure 6. This allows a field technician or craft
personnel to conduct loop testing from the remote end
independent of the test center or CO.
5. DEPLOYMENT GUIDELINES
The DDS-DP and DDS-R use technology designed 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 Total
Reach DDS. See Table 4 and Table 5 for more
information.
• 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 Total Reach DDS.
Table 4. Cable Type and Temperature Loss Data @ 13.3 kHz
NOTE
The 50 dB AML limit includes 6 dB of signal
margin to account for potential near-end cross
talk (NEXT) from other digital services that
may be provisioned in the same binder group.
• Loop length should not exceed 50 kft.
• Bridged tap length should not exceed 12 kft.
• Background noise level should not exceed
3 dBrn.
• Impulse noise should not exceed
- 0 dBm, (+50 dBrn).
NOTE
Measure noise with 50 kbit weighting
characteristic approximating a filter with a
passband of 0 Hz to 30 kHz. Background noise
level or impulse noise level is referenced from
56/6 kbps data rate in TR62310.
Table 5. DDS Insertion Loss Measurements
Figure 6. DDS-DP Response to DDS-R ACE
Loopback Button
Test
Unit
(example)
DDS-R ACE
Series 5
DDS-DP
Loopback Button
Loopback
Toward Customer
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661433105L1-5F Section 61433105L1, Issue 6
6. MAINTENANCE
The DDS-DP does not require maintenance for normal
operation.
7. WARRANTY AND CUSTOMER SERVICE
ADTRAN will replace or repair this product within
ten (10) years from the date of shipment if it does not
meet its published specifications or fails while in
service. Refer to ADTRAN U.S. and Canada Carrier
Networks Equipment Warranty, document
60000087-10.
Contact Customer and Product Service (CAPS) prior
to returning equipment to ADTRAN.
For service, CAPS requests, or further information,
contact one of the following numbers:
ADTRAN Sales
Pricing/Availability
[phone]
ADTRAN Technical Support
Pre-sales Applications/Post-sales Technical Assistance
[phone]
Standard hours: Monday-Friday, 7 a.m. - 7 p.m. CST
Emergency hours: 7 days/week, 2 hours/day
ADTRAN Repair/CAPS
Return for Repair/Upgrade
[phone]
Repair and Return Address
ADTRAN, Inc.
CAPS Department
901 Explorer Boulevard
Huntsville, Alabama 35806-2807