ADTRAN DSU-CSU, TROCU DP User Manual
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
DIAGNOSTICS............................................................. 4
6. DEPLOYMENT GUIDELINES.................................... 5
7. WARRANTY AND CUSTOMER SERVICE ............... 6
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
Pass-Thru Mode ................................................. 4
Figure 7. TROCU DP Bidirectional Loopback
Normal Mode ..................................................... 4
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
Section 61291006L2-5
Issue 2, June 1999
CLEI Code #D4D3MPY_ _ _
SW1
TROCU DP
1291006L2
SD4 2-WIRE
SC
64
56
19.2
9.6
SYNC
4.8
LOSS
2.4
NEAR
SW56
CRC
FAR
CRC
REM
QM
AP
DISC
NO
DSU
LBK
IDLE
L
O
Rx
G
(OUT)
I
C
Tx
(IN)
Figure 1. TROCU DP Preferred Option
traditional four-wire Alternate Mark Inversion (AMI)
signal for presentation to the customer.
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.
1. GENERAL
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
Trademarks: Any brand names and product names included in this document are
trademarks, registered trademarks, or trade names of their respective holders.
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.
T-Carrier
D4 or SLC-96
TR
OCU
DP
2-Wire Loop
T/R Pair
Customer Premises
4-Wire Customer
TRDDS-R
Interface
DSU/CSU
Figure 2. Total Reach DDS Circuit Diagram
161291006L2-5B Section 61291006L2, Issue 2
NOTE
SW1
A/B Signaling
Quality Monitor
1
ON
2
OFF
OFF
Do not use in SLC-96 Mode II unless unit is
provisioned through Digital System-6.
2. OPTIONS
Select the appropriate OPTIONS and RATE using
SW1 and faceplate switches as illustrated in Figure 3
and Figure 4.
NOTE
The TROCU DP must be used with an
appropriate TRDDS-R unit.
Features
In addition to operation over extended ranges the
TROCU DP incorporates or supports the following:
• Two-wire deployment.
• Repeaterless operation.
• Bridged tap tolerant
• Span power for remote TRDDS-R termination
unit.
• Utilization in all D4 channel bank and SLC-96
Mode I or III remote terminal applications.
• NEAR and FAR logic level bantam test access.
• Loop Quality Monitor and A/B signaling
options.
• Embedded Digital System 6 capabilities for
remote provisioning, configuration, and
performance monitoring.
Line Code
The ADTRAN TRDDS incorporates Simple CodedPulse Amplitude Modulation (SC PAM), a line code
that reduces the bandwidth needed to transport signals
over copper loops. The Power Spectrum Density
(PSD) of SC PAM complies with Basic Rate Interface
(BRI) PSD mask as specified in ANSI T1.601 and is
below allowable 2B1Q PSD levels. SC PAM
increases the deployment ranges and allowable
bridged tap lengths when compared to AMI and
2B1Q. Additionally, SC PAM has an improved
spectral compatibility when compared to AMI and
2B1Q.
Sealing Current
The TROCU DP provides a constant 10 mA sealing
current to the TRDDS-R. With 10 mA sealing current
and span power of -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.
CAUTION
Select only one option rate. Rate is selected on
faceplate switch SW2 by pushing one or two
switches to the right toward the inscribed
rates. If either SW56 or 64 is selected, the
secondary channel (SC) switch may not be
selected.
A/B Signaling
When A/B Signaling (SW1-1) 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 option is only applicable when SW56 is
selected; otherwise the option is a “don’t care.”
Quality Monitor
When Quality Monitor (SW1-2) is ON, the unit
monitors the incoming two-wire loop and four-wire
customer interface data for errors. If excessive errors
are detected, the unit blocks customer data
transmission and sends Abnormal Station Code to the
network. Customer data transmission is automatically
restored when the trouble condition is cleared. The
Quality Monitor feature is recommended for use on
multipoint circuits.
SC
78564231
64
56
19.2
9.6
4.8
2.4
SW56
ON
Figure 3. Option
Switch
Figure 4. Rate
Selection
2 61291006L2-5BSection 61291006L2, Issue 2
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