Installation; Table 1. Faceplate Indicators; Table 2. Compliance Codes - ADTRAN DDM+ H2TU-C Installation And Maintenance Manual

Description
DSX-1 signals are provided to and received from the
network while HDSL2 signals are provided to the
local loop. The ADTRAN H2TU-C works in
conjunction with the ADTRAN H2TU-R to provide a
DS1 service up to 12,000 feet on the local loop.
This H2TU-C works with multiple list versions of the
HDSL2 Unit for the Remote end (H2TU-R) some of
which are listed below:
Part Number Description
1221026LX ........... T200 H2TU-R
1222026LX ........... 2nd Gen T200 H2TU-R
The H2TU-C can be deployed in circuits consisting of
one H2TU-C and one H2TU-R.
System power and alarm bus connections are made
through the backplane of the DDM+ shelf. DSX-1 and
HDSL2 signals are connected through wire-wrap pins
related to each individual slot on the rear of the shelf.
The H2TU-C contains an onboard fuse. If the fuse
opens, it supplies a -48 VDC voltage to the fuse alarm
bus and all Faceplate indicators turn Off. The fuse is
not designed to be replaced in the field.
The H2TU-C 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.

2. INSTALLATION

C A U T I O N !
SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
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.
The H2TU-C plugs directly into the AT&T DDM+ shelf.
The unit may be plugged into any of the 28 slots of
the DDM+ shelf. No installation wiring is required.
Faceplate Indicators
The H2TU-C has one faceplate LED which indicates
operational status. Table 1 defines this LED.
2

Table 1. Faceplate Indicators

LED
STATUS ..... Blinking Red .......... Signal Quality of 0 or No
Compliance Codes
Voltages up to -200 VDC may be present on the
telecommunications wiring.
The DSX-1 connections should be connected to
intra-building wiring only.
Table 2 shows the Compliance Codes for the DDM+
H2TU-C with Display. The DDM+ H2TU-C with
Display complies with the requirements covered under
UL 60950, Third Edition, and is intended to be
installed in an enclosure with an Installation Code
(IC) of "B" or "E."
This product is intended for installation in
Restricted Access Locations only.

Table 2. Compliance Codes

Code
Installation Code (IC)
Telecommunication Code (TC)
Power Code (PC)
61222003L1-5, Issue 1
Description Indication
Sync on the HDSL2 loop
Solid Red ................ Alarm on the HDSL2 loop,
DSX, or DS1
Blinking Amber ...... In-band loopbacks armed
Solid Amber ........... Loopbacks active
Blinking Green ....... ES, SES, or BPV occurred
Solid Green ............. Everything functioning OK
CAUTION
CAUTION
NOTE
Input Output
A –
– X
F C
61222003L1-5A