2
64291043SAALL-5E
Section 64291043SAALL-5, Issue 5
C A U T I O N !
SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
HANDLING PRECAUTIONS REQUIRED.
The LBK option selects CSU loopback response.
Figure 2
is a diagram of the Total Reach DDS Circuit.
T400/T200 Housing Features
• Standalone Type-400/Type-200 housing
• Span Powered
• Network connection via terminal barrier strip
• Customer connects to RJ-48 or barrier strip
• Durable metal enclosure
Total Reach DDS-R Features
• 2-wire deployment
• Repeaterless operation
• Auto-rate adoption on subrates, 19.2 and 56 kbps
rates, including secondary channel, and 64 kbps
clear channel capability
• Span-powered
• Bridged tap tolerant
• LED indicators for Power, SYNC, NEAR/FAR
CRC, Service Rate, and Loopback
• Signal-level indication during synchronization
• Automatic signal cut-through upon detection of
bidirectional Central Office (CO) loopback at
power-up
• T200 mechanics
2.
OPTIONS
Rate is automatically configured from the TROCU DP
unit. Options are selected using circuit board DIP
switch SW1 as illustrated in
Figure 3
.
unit will respond only to the latching loopback
sequence for the Network Interface Device.
When
0 dB (SW1-2) is selected, the unit will transmit
a 0 dB AMI signal across the 4-wire customer
interface toward the DSU/CSU. When -10 dB is
selected, the unit will transmit a -10 dB AMI signal
toward the DSU/CSU.
3. INSTALLATION
After unpacking the unit, inspect it for damage. If
damage is discovered, file a claim with the carrier,
then contact ADTRAN. See
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.
•
TROCU-DP normally provides -130 V of
span-powering voltage to the Total Reach
DDS-R.
T400/T200 Wiring
The ADTRAN T400/T200 housing is designed for
either horizontal or wall mounting. If wall mounting is
used:
• Open the housing cover and remove the Total
Reach DDS-R circuit card.
• Secure the T400/T200 housing to the wall using
the mounting holes shown in
Figure 4
. Ensure
clearance to completely open the cover.
• Replace the circuit card through the front of the
housing until it snaps into the card edge connector
(J1), shown in Figure 4.
The Total Reach DDS-R requires a frame ground
connection to pin 11 of the gold finger connector. A
ground lug (L1), as illustrated in Figure 4, is provided
to connect an external frame ground wire to the unit.
L1 provides Frame Ground connections for pins 11 and
27 of the plugin’s gold finger card edge.
Figure 2. Total Reach DDS Circuit Diagram
T-Carrier
Channel Bank
2-Wire Loop
4-Wire Customer
Interface
DSU/CSU
TRDDS-R
TR
OCU
DP
T/R Pair
Customer Premises
When LBK (SW1-1) is selected, the unit will respond
to loopback commands with a regenerative loopback
toward the network. When LBK OFF
is selected, the
Figure 3. Total Reach DDS-R Option Switch
1
2
LBK OFF
0dB
LBK
-10dB
SW1
O
N
