4
Section 61246026L6-5, Issue 2
61246026L6-5B
Pin
Designation
Description
1 ........ CH GND ....... Chassis ground
5 ........ DS1-T1 ......... DS1 receive out tip (to customer
interface)
7 ........ H1-T ............. HDSL Loop 1 tip (facility)
11 ....... CH GND ....... Chassis ground
12 ....... GND .............. Ground for protection switching
13 ....... H1-R ............. HDSL Loop 1 ring (facility)
15 ....... DS1-R1 ......... DS1 receive out ring (to customer
interface)
20 ....... VCC .............. +5VDC for protection switching
27 ....... CH GND ....... Chassis ground
32 ....... PROT-4 ......... Control line for protection switching
34 ....... PROT-3 ......... Control line for protection switching
38 ....... PROT-2 ......... Control line for protection switching
40 ....... PROT-1 ......... Control line for protection switching
41 ....... H2-T ............. HDSL Loop 2 tip (facility)
47 ....... H2-R ............. HDSL Loop 2 ring (facility)
49 ....... DS1-R ........... DS1 transmit in ring (from customer
interface)
55 ....... DS1-T ........... DS1 transmit in tip (from customer
interface)
Table D. Card Edge Pin Assignments
Figure 2. P1 Jumper Location
Switch
Label
Function
REM .......... Pressing this switch changes the HTU-C customer
loopback state as follows:
• If the HTU-C
is not
in loopback, pressing REM
activates
the loopback.
• If the HTU-C
is
in loopback, pressing REM
deactivates
the loopback.
LOC ........... Pressing this switch changes the HTU-R customer
loopback state as follows:
• If the HTU-R
is not
in loopback, pressing LOC
activates
the bilateral loopback.
• If the HTU-R
is
in loopback, pressing LOC
deactivates
the bilateral loopback.
Table C. Front Panel Loopback Switches
3. CONNECTIONS
All connections of the HTU-R are made through
card edge connectors. Table D gives the card edge
pin assignments for the HTU-R circuit pack.
When the circuit pack is installed in any of the
HTU-R enclosures, all connections are made
through the enclosure backplanes. See the
following ADTRAN Installation and Maintenance
practices for more information:
Number
Description
61242007L1-5 .......... HR12 Installation and
Maintenance
61242008L1-5 .......... HR4 Installation and
Maintenance
61242034L2-5 .......... T400 Single Mount
Installation and Maintenance
(removable RJ-48 jacks)
61245034L1-5 .......... T200 Dual-slot Installation
and Maintenance (APS
Housing)
Caution: Ensure chassis ground is properly
connected for either standalone or
shelf-mounted applications.
4. HDSL SYSTEM TESTING
The T200 HTU-R provides diagnostic, loopback,
and signal monitoring capabilities.
The seven front panel LEDs provide diagnostics for
HDSL loops, DS1 signals, alarms, provisioning, and
loopbacks. See subsection 2 of this practice for
details.
The HTU-R provides local and remote loopback
capabilities via the loopback switches or through the
craft interface port (DB9) on the faceplate.
The DS1 MON jacks provide a non-intrusive access
for DS1 signal monitoring.
LBO
P1
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