ADTRAN 1245001L6, Руководство по установке и обслуживанию

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2 Section 61245001L6-5, Issue 7 61245001L6-5G
This HTU-C M R works with multiple list versions
of the HDSL unit for the Remote end (HTU-R) and
HDSL Range Extender (HRE) as listed below:
Part Number Description
1244021L1 Low Voltage HTU-R T400 CP
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 T200 SA
1245026L1 Low Voltage HTU-R T200 CI
1245045L1 Low Voltage 239 T1 HRE
The HTU-C M R can be deployed in circuits
consisting of one or two HREs and an HTU-R.
NOTE
When deployment requires the use of two
HREs, the HTU-C M R can be deployed with
two Low Voltage HREs (1244041L2,
1245042L1, 1244044L1, or 1245045L1) and
one Low Voltage HTU-R (1245026LX).
The HDSL local loop operates as two independent
subsystems, each operating over a single twisted
pair. The HTU-C M R communicates over these
pairs to the HDSL Transceiver Unit for the 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
via the backplane of the 220 shelf. DSX-1 and
HDSL signals are connected through wire-wrap pins
or the 50-pin shelf connectors relative to each
individual slot.
The HTU-C M R contains onboard fuses. If a fuse
opens, it supplies a -48 Vdc voltage to the fuse
alarm bus and all front panel indicators will turn
off .
These fuses are not field-replaceable.
The 220/E220 HTU-C M R uses a DC-to-DC
converter to derive its internal logic and span
powering voltages from the -48 Vdc office supply.
Span powering voltages meet all requirements of
Class A2 voltages as specified by Bellcore
GR-1089-CORE.
Revision History
This practice is being reissued to incorporate CLEI
code change.
2. INSTALLATION
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 of
this practice).
The 220/E220 Low Voltage HTU-C M R 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.
One six-position rotary switch (SW1), a
three-position slide switch (SW2), and a
three-position dipswitch pack (SW3) accessible
from the faceplate of the unit must be used to
manually configure the mode of operation. Manual
configuration can be performed after installing the
unit into the shelf. Faceplate switch locations are
illustrated in
Figure 1
. Option settings for SW1,
SW2 and SW3 are detailed in
Tables 2
,
3
, and
4
,
respectively.
Code Input Output
Installation Code (IC) A –
Telecommunication Code (TC) – X
Power Code (PC) F C
Table 1. Compliance Codes
C A U T I O N C A U T I O N !
SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
HANDLING PRECAUTIONS REQUIRED.