2
Section 61246001L2-5, Issue 2
61246001L2-5B
1244022L1
Low Voltage HTU-R SA
1244041L2
Low Voltage T400 HRE
1244042L1
Low Voltage 819A HRE
1244044L1
Low Voltage 439 HRE
1245021L1
Low Voltage HTU-R T200
CP
1245022L1
Low Voltage HTU-R SA
1245024L1
T400 HTU-R w/Local Power
Option
1245026LX
Low Voltage HTU-R
1246026LX
6th Gen HTU-R
1245041L1
T200 HRE
1245045L1
239 HRE
1246041L1
T200 HRE
1246045L1
239 HRE
The HTU-C M can be deployed in circuits consisting
of one HTU-C M and one HTU-R. When deployment
requires the HDSL Range Extenders, the HTU-C M
can be deployed with one or two Low Voltage HREs
and one Low Voltage HTU-R.
The HDSL local loop operates as two independent
subsystems each operating over a single twisted pair.
The HTU-C M communicates over these two twisted
pairs to the HDSL Transceiver Unit Remote end
(HTU-R). Each subsystem carries half of the total
bandwidth along with a small amount of overhead
used for maintenance and performance monitoring.
System power and alarm bus connections are made
through the backplane of the 220 shelf. DSX-1 and
HDSL signals are connected through the wire-wrap
pins or the 50-pin shelf connectors related to each
individual slot.
The HTU-C M contains an onboard fuse. If the fuse
opens, it supplies a -48 VDC voltage to the fuse alarm
bus and all front panel indicators will be
off
. This fuse
is not field-replaceable.
The 220/E220 HTU-C M uses a DC-to-DC converter
to derive its internal logic and span powering voltages
from the -48 VDC office supply. The 220/E220
HTU-C M can span power HREs and HTU-Rs as
listed above. When used with Low Voltage HREs and
HTU-Rs, the HTU-C M can span power the Low
Voltage HTU-R and Low Voltage HREs at either less
than -140 VDC or at -190 VDC. Span powering
voltages meet all requirements of Class A2 voltages as
specified by Bellcore GR-1089-CORE.
Revision History
This is the second issue of this practice. This revision
correct default settings for the SW6 and SW7.
2. INSTALLATION
CAUTION:
Unit subject to electrostatic damage or
decrease in reliability. Handling precautions
required.
After unpacking the unit, inspect it for possible
shipping damage. If damage is discovered, file a
claim immediately with the carrier, then contact
ADTRAN Customer Service (see subsection 10).
The 220/E220 HTU-C M plugs directly into standard
220 office repeater shelves. These include Kentrox
T-Term 220, Wescom 34220 and 34230, Lynch
303MA30 as well as the ADTRAN E220 Shelf and
the ADTRAN E220 RP Shelf. No installation wiring
is required.
Electrical Code Compliance
Table 1 shows the UL/CUL Telecommunications
Codes for the 220/E220 HTU-C. The 220/E200
HTU-C complies with the requirements covered under
UL 1459 third edition and is intended to be installed
in an enclosure with an Installation Code (IC) of “B”
or “E.”
NOTE:
1. This product is intended for installation
in RESTRICTED ACCESS
LOCATIONS only.
2. Input current at maximum load is 0.7 A
Table 1. UL/CUL Telecommunications Codes
e
d
o
C
t
u
p
n
I
t
u
p
t
u
O
C
I
A
–
C
T
–
X
C
P
F
C
