ADTRAN T400 DDST III Installation And Maintenance Manual

PRACTICES
DIGITAL DATA STATION TERMINATION W/LOCAL POWER
CONTENTS
1. GENERAL ................................................................... 1
2. INSTALLATION ........................................................... 2
3. TESTING ..................................................................... 4
4. WARRANTY AND CUSTOMER SERVICE ................ 6
FIGURES
Figure 1. T400 DDST III LOCAL POWER ......................... 1
Figure 2. Circuit Card Pin Assignments ............................. 2
Figure 3. SW2 Option Labeling .......................................... 2
Figure 4. Bidirectional Connections for Loops
Greater Than -45 dB ........................................... 3
TABLES
Table A. Part Numbers ....................................................... 2
Table B. SW2 Option Settings ........................................... 2
Table C. Faceplate Indicators and Controls ...................... 3
Table D. All-1s Repeater Release Code Sequence .......... 4
Table E. Alternating Loopback Activation Sequence ......... 5
Table F. Latching Loopback Activation Sequence ............. 5
1. GENERAL
This section provides installation and maintenance
information for the ADTRAN
Termination (DDST III) with Local Power. The T400
DDST III is Type-400 mount compatible. A detailed
description of the unit can be found in ADTRAN Practice,
61212021L3-2. Figure 1 is a drawing of theT400 DDST
III with Local Power.
Document Revision History
Revisions to this practice include SW2 factory setting for
RPT option OFF .
Features
The basic features of the T400 DDST III, part number
1212021L3, include:
• All subrates, 19.2, 38.4, and 56 kbps loop rates, including
Secondary Channel and 64 kbps Clear Channel capability
• Adapts automatically to loop rate
• Powered by -48 VDC supplied by mounting assembly
(local power)
• Manual and remote latching loopback
• Optional CSU loopback response
61212.021L3-5C
Trademarks: Any brand names and product names included in this document are trademarks, registered trademarks,
C A U T I O N !
SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
HANDLING PRECAUTIONS REQUIRED.
MODEL T400 DDST III LOCAL POWER
INSTALLATION AND MAINTENANCE
®
T400 Digital Data Station
Section 61212021L3-5, Issue 3
trade names of their respective holders.
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Figure 1. T400 DDST III LOCAL POWER

• -10dB output toward customer (regen mode only)
• Extended loop option
• Front panel indicators for rate, loopback, >34 dB
loop loss, reversed network wire pairs, and loss of
sealing current
• Signal cut-through upon loss of power
The DDST III unit is an auto-rate adaptive digital network
interface located at the customer premises point-of-
demarcation. It primarily functions as a regenerative
loopback device supporting telco-generated testing. A
switch-selectable regeneration capability accommodates
45 dB loop-loss deployment to customer equipment
designed to meet the -34 dB receiver sensitivity
requirement of applicable industry standards. The DDST
III interfaces with an OCU, OCU DP, or digital data
service (DDS) repeater from the network interface, and
a DSU/CSU from the customer interface of the unit.
The DDST III automatically adapts to the output signal of
the central office OCU or OCU DP and supports all
standard rates as well as 19.2, 38.4, and 64 kbps.
Section 61212021L3-5
Issue 3, September 1997
CLEI Code # NCTDENW_ _ _
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