Connections; Hdsl2 System Testing; Figure 2. H2Tu-R Mon Diagram; Table 4. Card Edge Pin Assignments - ADTRAN T200 H2TU-R Installation And Maintenance Manual

3. CONNECTIONS

All connections of the H2TU-R are made through card
edge connectors. Table 4 gives the card edge pin
assignments for the H2TU-R circuit pack.

Table 4. Card Edge Pin Assignments

Pin Designation Description
1 ......... CH GND ....... Chassis ground
5 ......... DS1-T1 ......... DS1 receive out tip (to customer
interface)
7 ......... H1-T ............. HDSL2 Loop tip (facility)
11 ....... CH GND ....... Chassis ground
12 ....... GND .............. Ground for protection switching
13 ....... H1-R ............. HDSL2 Loop ring (facility)
15 ....... DS1-R1 ......... DS1 receive out ring (to customer
interface)
17 ....... -48VR ........... -48 Vdc Return
20 ....... VCC .............. +5 Vdc for protection switching
27 ....... CH GND ....... Chassis ground
35 ....... -48VR ........... -48 Vdc
40 ....... PROT-1 ......... Control line for protection switching
49 ....... DS1-R ........... DS1 transmit in ring (from customer
interface)
55 ....... DS1-T ........... DS1 transmit in tip (from customer
interface)
When the circuit pack is installed in any of the
H2TU-R enclosures, all connections are made through
the enclosure backplanes. See the following
ADTRAN documents for more information:
• 61242007L1-5, HR12 Installation/Maintenance
• 61242008L1-5, HR4 Installation/Maintenance
• 61242034L3-5, T400 Single-Mount High
Voltage Installation/Maintenance
• 61245034L1-5, T200 Dual-Mount Installation/
Maintenance
ADTRAN's T200 Dual-Mount housing (P/N
1245034L1) is required when using the T200 H2TU-R
for HDSL2 Loop Support System (H-LSS ™).
NOTE
Ensure chassis ground is properly connected for
either standalone or shelf-mounted applications.

4. HDSL2 SYSTEM TESTING

The T200 H2TU-R provides diagnostic, loopback, and
signal monitoring capabilities.
4
The six front panel LEDs provide diagnostics for
HDSL2 loops, DS1 signals, alarms, provisioning and
loopbacks. See section 2 of this practice for details.
The H2TU-R provides local and remote loopback
capabilities via the loopback switches on the front
panel.
The DS1 MON jacks provides a nonintrusive access
for DS1 signal monitoring.
DS1 MON Bantam Jacks
The jack labeled "MON" provides a nonintrusive
access point for monitoring the transmit and receive
signals at the DS1 interface point.
In general, the monitoring jacks provide a non-
intrusive tap onto a signal line that permits the
connection of test equipment to monitor the
characteristics of that signal. For example, the DS1
MON jack on the H2TU-R could be used to connect to
a bit error rate tester to monitor for synchronization,
test patterns, etc. Figure 2 is an illustration of
specific jack detail.

Figure 2. H2TU-R MON Diagram

H2TU-R Network Loopbacks
The H2TU-R responds to multiple loopback activation
processes. The loopback position is a logic loopback
located within the H2TU-R internal HDSL
transceiver. See Figure 3.
First, manual loopback activation may be
accomplished using the control port of the H2TU-C.
Refer to the ADTRAN H2TU-C Installation and
Maintenance practice (P/N 61222001LX-5) or other
H2TU-C practices for more information.
61222024L6-5, Issue 1
H2TU-R
T
R
Tx
CUST
MON
Rx
T1
R1
61222024L6-5A