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• Protected Loopback prevents false latching
loopback at 64 kbps
• Alternating Mux-Out-of-Sync/Abnormal Station
trouble code during loss of loop synchronization
• Utilization in D4 channel bank and SLC-96
remote terminal applications
• NEAR and FAR logic level Bantam test access
• Loop Quality Monitor and latching loopback
Description
The ADTRAN D4 TRDDB is a 2-wire Total Reach
DDS functional replacement for the following
ADTRAN 4-wire OCU part numbers:
• 1104004L3
• 1104004L4
• 1105004L1
• 1105004L2
• 1105018L1
The TRDDB delivers data at rates up to 64 kbps using
a single copper pair. Used in combination with the
TROCU-R termination unit, the TRDDB can
accommodate extended loop lengths, eliminating the
need for DDS repeaters. The TRDDB span powers the
remote TROCU-R located at the customer premises.
The TROCU-R converts the 2-wire signal to the
traditional 4-wire Alternate Mark Inversion (AMI)
signal for presentation to the customer.
The ADTRAN TRDDB occupies a single channel
position in the WECO
®
compatible D4 channel bank,
®
GPC shelf, or AT&T
SLC-96 terminal. It provides
the interface between a DS0 signal and the 2-wire
metallic loop extending to the customer premises. The
TRDDB will interoperate with another TRDDB, OCU
DDB, DS0 DP, MJU, or 1/0 DCS and can be located
in an end office, hub office, or intermediate office.
Figure 2. DS0 Level Test Access for DDS Customers with Two End Points Served from Same
2
D4OCBRD2AA
D4OCBRE2AA
D4OCBSD2AA
D4OCBSE2AA
D4OCBTD2AA
Test
DS0
TRDDB
Head
GPC, D4,
or
SLC96
TRDDB
DS0
CO
61291004L2-5, Issue 2
Application
In a typical application the TRDDB can be used to
provide test access at the DS0 level for DDS circuits
served from a single CO (Figure 2). By using
TRDDB channel units in this configuration instead of
other dataport channel units, valuable port space on
1/0 DCS devices can be saved.
TRDDB channel units can be used to deliver
multipoint DDS circuits connected to MJUs in
ADTRAN GPC shelves or D4/SLC-96 channel banks
(Figure 3). The TRDDB can also be used in
applications where an IXC T1 is back-hauled to a
metallic SMAS point in a local DDS serving CO
(Figure 4).
The TRDDB must be used with an appropriate
TROCU-R unit.
2. INSTALLATION
C A U T I O N !
SUBJECT TO ELECTROSTATIC DAMAGE
HANDLING PRECAUTIONS REQUIRED.
After unpacking the unit inspect it for damage. If
damage is noted file a claim with the carrier, then
contact ADTRAN. See Warranty and Customer
Service.
2-wire
Loop
TR
OCU-R
50 kft
2-wire
Loop
TR
OCU-R
50 kft
Customer Premises
CO.
NOTE
OR DECREASE IN RELIABILITY.
DSU/
CSU
DSU/
CSU
61291004L2-5B
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