Section 61291006L2-5
Issue 2, June 1999
CLEI Code #D4D3MPY_ _ _
Model TROCU DP Preferred Option
®
Total Reach All-Rate DDS Dataport
Installation and Maintenance
CONTENTS
1. GENERAL..................................................................... 1
2. OPTIONS ...................................................................... 2
3. INSTALLATION ........................................................... 3
4. TESTING....................................................................... 3
5. REMOTE PROVISIONING AND
SW1
OCU DP
TR
1291006L2
SD4 2-WIRE
SC
64
56
19.2
9.6
4.8
2.4
SW56
SYNC
LOSS
NEAR
CRC
FAR
CRC
DIAGNOSTICS............................................................. 4
6. DEPLOYMENT GUIDELINES.................................... 5
7. WARRANTYAND CUSTOMER SERVICE ............... 6
REM
QM
DISC
AP
NO
DSU
LBK
IDLE
L
O
G
I
Rx
(OUT)
C
Tx
(IN)
FIGURES
Figure 1. TROCU DP Preferred Option ............................. 1
Figure 2. Total Reach DDS Circuit Diagram ..................... 1
Figure 3. Option Switch ..................................................... 2
Figure 4. Rate Selection ..................................................... 2
Figure 5. OCU Loopback at the TROCU DP ..................... 4
Figure 6. TROCU DP Bidirectional Loopback
Figure 1. TROCU DP Preferred Option
Pass-Thru Mode ................................................. 4
Figure 7. TROCU DP Bidirectional Loopback
traditional four-wire Alternate Mark Inversion (AMI)
signal for presentation to the customer.
Normal Mode ..................................................... 4
The TROCU DP occupies a single channel position in
the WECO® compatible D4 channel bank or the
AT&T® SLC-96 Mode I and III terminal. It provides
the interface between a DS0 timeslot of the T-carrier
data stream, and the two-wire metallic loop extending
to the customer premises.
TABLES
Table 1. Preprovisioning ..................................................... 3
Table 2. Cable Type Loss Data @ 13.3 kHz....................... 3
Table 3. LED Indicators ..................................................... 5
Table 4. TRDDS Insertion Loss Measurements ................. 5
1. GENERAL
The TROCU DP may interoperate over the carrier
system with another TROCU DP, an OCU DP, a DS0
DP, a 1/0 DCS, or the central office switch. The unit
can be located in an end office, hub office,
intermediate office, or remote terminal digital carrier
system (see Figure 2). The two-wire loop is
connected using the tip (pin 24) and ring (pin 51) on
the D4 backplane.
This practice provides installation and maintenance
procedures for the ADTRAN D4 Total Reach Office
Channel Unit Dataport (TROCU DP) Preferred
Option. The unit is illustrated in Figure 1.
Document Revision History
Issue 2 of this document revises the Deployment
Guidelines subsection.
Description
ADTRAN D4 TROCU DP Preferred Option is a
functional replacement for the D4 OCU DP,
delivering data at rates up to 64 kbps on a single
copper pair. Used in combination with the Total
Reach Digital Data Service Remote termination unit
(TRDDS-R), the TROCU DP can accommodate
extended loop lengths eliminating the need for DDS
repeaters. The TROCU DP span powers the remote
TRDDS-R located at the customer premise. The
TRDDS-R converts the two-wire signal to the
D4 or SLC-96
Customer Premises
4-Wire Customer
Interface
2-Wire Loop
T/R Pair
TR
OCU
DP
T-Carrier
TRDDS-R
DSU/CSU
Figure 2. Total Reach DDS Circuit Diagram
Trademarks: Any brand names and product names included in this document are
trademarks, registered trademarks, or trade names of their respective holders.
61291006L2-5B
1
In lieu of option switches, the TROCU DP Preferred
Option has been preprovisioned with feature settings
as indicated in Table 1.
When inserted into a powered up backplane the
TROCU DP and TRDDS-R will synchronize within 30
to 90 seconds. When synchronized, the SYNC LOSS
indicator LED will turn Off. If synchronization cannot
be achieved, check the T/R pair for an open circuit or
short circuit condition, or load coils (see LED
Indicators).
Table 1. Preprovisioning
Feature
Setting
Latching Loopback
ON
4. TESTING
Testing for the TROCU DP is accomplished using the
same test procedures for four-wire OCU and OCU DP
units. Table 2 describes cable loss for the TRDDS
Nyquist frequency of 13.3 kHz.
ON (Unless 56 kbps, SC, and
64 kbps = OFF)
Zero Code Suppression
Error Correction
OFF
The TROCU DP is equipped with logic level bantam
test access jacks that permit testing in both directions
using a portable test set. Latching and alternating OCU
and CSU loopback sequences are supported.
Alternating loopbacks do not operate when the 64
kbps data rate is selected. Choose NEAR to test
toward the customer loop; choose FAR to test toward
the T-carrier.
3. INSTALLATION
C A U T I O N !
SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
HANDLING PRECAUTIONS REQUIRED.
The TROCU DP plugs directly into a WECO or
equivalent D4 channel bank or the ADTRAN ACT
1900/2300 channel bank. No special wiring is
required. The two-wire loop uses the T/R (Tip and
Ring) pair, pins 24 and 51 of the D4 backplane.
In the FAR direction, an OCU loopback sequence will
loop the unit directly across the T-carrier system. In
the NEAR direction, an OCU loopback sequence will
loop the unit directly connected to the portable test set.
Span-powering is accomplished using -130 V,
measured from Tip to Ring. Voltage measured from
Tip to GND should indicate approximately -130 V;
voltage from Ring to GND should indicate
approximately 0.0 V.
NOTE
If64kbpsisselected,theunitwillonlyrespond
to latching loopback sequences. Alternating
sequences are not valid at this rate.
Table 2. Cable Type Loss Data @ 13.3 kHz
Plastic Cable
dB Loss/kft
0.5302
Paper Cable
19 Gauge PULP (0F)
19 Gauge PULP (70F)
19 Gauge PULP (120F)
dB Loss/kft
19 Gauge PIC (0F)
19 Gauge PIC (70F)
19 Gauge PIC (120F)
0.5616
0.6415
0.6955
0.6083
0.6610
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
61291006L2-5B
Section 61291006L2, Issue 2
3
As an enhancement to automated testing capability,
TRDDS eliminates false error indication when
invoking NIE, CSU, or DSU loopbacks immediately
following release of OCU loopback.
TROCU DP
TRDDS-R
X
X
DSU/CSU
Open Loop
TROCU DP Bidirectional Loopback Support
The TROCU DP will execute a bidirectional loopback
when performing an OCU loopback at the TROCU
DP as shown in Figure 5. If the TRDDS-R detects a
bidirectional loopback during power-up
Bidirectional
loopback
Figure 7. TROCU DP Bidirectional Loopback
Normal Mode
synchronization, the TRDDS-R allows data to pass on
the four-wire interface by entering into the pass-thru
mode. This allows 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
TROCU DP LBK LED will illuminate solid during an
OCU loopback. Refer to Figure 6 for an illustration
of the bidirectional loopback pass-thru mode.
5. REMOTE PROVISIONING AND
DIAGNOSTICS
Control Protocol
Remote access to provisioning and status information
is accomplished using ADTRAN Digital System 6
Message protocol, defined in Control and Diagnostic
Procedures Practice, Section 6032991-6. Digital
System 6 is supported by the TPI 108/109 and 105
portable test set and is supported by Hekimian React
2001 Release 1.900 remote test system. The TRDDS
network elements comply with ANSI T1.107-1995,
“Digital Hierarchy Format Specifications Annex G”
which allows remote provisioning, querying, and
performance monitoring via inband control of network
elements.
TROCU DP
Intra-office
Customer
Bidirectional
loopback
NOTE
TheREACT2001GUIsoftwareRelease1.900
supports ANSI T1.107-1995.
Figure 5. OCU Loopback at the TROCU DP
TROCU DP
Remote access is accomplished using a defined set of
inband DS0 byte sequences similar to the latching
loopback sequence. Commands issued through the test
system are recognized by the individual channel unit,
which responds with the appropriate byte sequences.
These inband commands may be used to verify
options via dialogs with REACT 2001 and
TPI 108/109 test sets. Unit CLEI, serial number,
provisioning, and performance information can be
retrieved remotely using the Digital System 6
protocol.
TRDDS-R
Test Unit
Data
Pass-Thru
Bidirectional
loopback
Figure 6. TROCU DP Bidirectional Loopback
Pass-Thru Mode
If the TROCU DP 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 TROCU DP 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.
Provisioning and Status
All configuration options can be remotely viewed or
provisioned. The front panel Remote (REM) LED
indicator will Flash during control link establishment
and remains ON after the channel unit has been
remotely provisioned.
If the channel unit has been remotely provisioned, the
operator can alternate between remote configuration
4
Section 61291006L2, Issue 2
61291006L2-5B
and manual switch settings by pressing the
momentary Alternate Provisioning (AP) switch
located on the front panel. If the channel unit is
removed from the system, the unit retains previous
provisioning information in nonvolatile Random
Access Memory (RAM).
6. DEPLOYMENT GUIDELINES
The TROCU DP and TRDDS-R use technology
designed to eliminate the need for repeaters and
concerns over impairments caused by typical noise and
bridge tap. Table 2 describes cable loss for the
TRDDS Nyquist frequency of 13.3 kHz. Listed below
are the loop design guidelines for TRDDS (See Tables
2 and 4 for more information).
The REM indicator remains ON when the channel
unit is operating based on Remote Provisioning, and
is OFF when operating on manual switches. If the
channel unit has never been remotely provisioned, the
AP switch has no effect and the REM indicator
remains OFF. See Table 3 for LED Indicators.
•
•
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.
Table 3. LED Indicators
NOTE
INDICATOR
DESCRIPTION
The 50 dB AML limit includes 6 dB of signal
margintoaccountforpotentialnear-endcross
talk (NEXT) from other digital services that
may be provisioned in the same binder group.
SYNC LOSS ON indicates that there is no sync
between the TROCU DP and the
remote TRDDS-R; check for
continuity, load coils, and other
abnormal line conditions.
NEAR CRC
FAR CRC
REM
ON indicates that there are errors
on the incoming data stream;
check for the abnormal line
conditions closer to the TROCU
DP.
•
•
•
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 level should not exceed -40 dBm,
(+50 dBrn).
ON indicates that there are errors
occurring towards the remote
TRDDS-R; check for the
abnormal line conditions closer to
the TRDDS-R.
NOTE
Measure noise with 50 kbit weighting
characteristic approximating a filter with a
passband of 40 Hz to 30 kHz. Background
noise level or impulse noise level is referenced
from 56/64 kbps data rate in TR62310.
ON indicates that the unit has
been remotely provisioned;
FLASHING indicates that the
remote control link is active.
Push the AP button to toggle
between manual and remote
provisioning.
QM DISC
NO DSU
ON indicates that the Quality
Monitor Disconnect has occurred.
Table 4. TRDDS Insertion Loss Measurements
TRDDS
13.3 kHz compared to 28 kHz for traditional
DDS service
ON indicates the absence of the
customer DSU/CSU as
determined by the TRDDS-R.
LBK
ON indicates the OCU or CSU
loopback activation.
Line
@ 13.3 kHz
@ 28 kHz
Configuration
27 kft 26 AWG
36.25 kft 24 AWG
50 kft 22 AWG
IDLE
ON indicates the presence of the
Control Mode Idle toward the
network.
50.12 dB
50.00 dB
50.24 dB
65.35 dB
62.50 dB
59.33 dB
61291006L2-5B
Section 61291006L2, Issue 2
5
7. 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 Networks Equipment Warranty,
Repair, and Return Policy and Procedure, document:
60000087-10A).
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 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.
CAPS Department
901 Explorer Boulevard
Huntsville, Alabama 35806-2807
6
Section 61291006L2, Issue 2
61291006L2-5B
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