CONTENTS
1. General .................................................................................................. 1
2. Installation ............................................................................................. 2
3. Connections ........................................................................................... 4
7. Maintenance ....................................................................................... 20
220 H4TU-C ........................................................................... 1
HDSL4 Loopbacks ................................................................. 6
Screen ................................................................................... 12
(Example) ............................................................................ 18
TABLES
Compliance Codes .................................................................. 2
61222401L1-5C
220 HDSL4 Transceiver Unit
for the Central Office
Installation and Maintenance Practice
Trademarks: Any brand names and product names included in this document are
trademarks, registered trademarks, or trade names of their respective holders.
CLEI Code: T1L5TWPC_ _
H TUC
1222401L1
TX
E
Q
RX
DSX
TX
M
O
N
RX
R
S
2
3
2
Figure 1. 220 H4TU-C
1. GENERAL
The ADTRAN 220 HDSL4 Transceiver Unit for the
Central Office (H4TU-C) (ADTRAN P/N
1222401L1) is used to deploy an HDSL4 T1 circuit
using 4-wire metallic facilities. See Figure 1. The
unit occupies one slot in a 220 shelf.
The DS1 or DSX-1 input signal is supplied from the
network. The HDSL4 signals are provided to the
local loop. The ADTRAN 220 H4TU-C works in
conjunction with the ADTRAN H4TU-R and up to
two H4Rs to provide a DS1 service on the local loop.
Section 61222401L1-5C
Issue 3, October 2003
DSL
1
DSL
2
DSX
/DS1
ALM
ESF
/SF
B8ZS
/AMI
LBK
1
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