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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 STS 3192 shelf. DSX-1
and HDSL2 signals are connected through the
wire-wrap pins or the 64-pin shelf connectors related
to each individual slot.
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.
Revision History
This is the initial release of this document. Future
revisions to this document will be explained in this
section.
Indicator
Description
1222004L2
DSL .........
Indicates five possible states of the quality of the HDSL2 signals on the Loop:
DSX .........
Indicates the following three conditions:
ALM ........
Indicates the following three conditions:
LBK .........
Indicates the following three conditions:
2
Table 1. Faceplate Indicators
Off .................. No synchronization of H2TU-C and H2TU-R on the Loop
Red ................. Poor signal quality on the Loop (> 10
Yellow ............ Marginal signal quality on the Loop (≤ 2 dB margin above 10
Green ............. Good signal quality on the Loop (> 2 dB margin above 10
Blinking .......... An error detected on either end of the Loop will cause this LED to blink briefly
Off .................. Network-side DSX-1 signal is absent or is of a format that does not match the
provisioning of the HDSL2 circuit
Blinking .......... Bipolar Violation (BPV), frame bit error (SF mode), or CRC error (ESF mode)
detected at DSX-1 signal
On Solid ......... Network-side DSX-1 signal is present and synchronized
Off .................. No alarm condition detected
Red ................. Alarm condition detected either locally (H2TU-C), or locally and remotely
(H2TU-C and H2TU-R)
Yellow ............ Remote alarm condition detected
Off .................. Unit is not in loopback or armed state
Yellow ............ Active loopback at the H2TU-C
Blinking .......... Unit is armed but not in active loopback condition
Section 61222004L2-5, Issue 1
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 standard CI Wescom
3192 office repeater shelves. The unit may be
plugged into any of the first 28 slots of the 3192 shelf.
No installation wiring is required.
Faceplate Indicators
The H2TU-C has four faceplate LEDs which indicate
operational status. Table 1 defines these LEDs.
Configuration is performed by manually selecting the
appropriate option switch or switches. One
six-position DIP switch (SW1) and one eight-position
rotary switch (SW5) are used to configure the mode of
operation. Switch functions are detailed in Table 2
and Table 3. Figure 2 shows the location of these
switches.
-7
BER)
-7
BER)
-7
BER)
61222004L2-5A
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