61245023L1-5B
Section 61245023L1-5B, Issue 2
7
If two T1 Nx64 HTU-Rs are deployed as Master and
Slave, connect the HDSL interface cable for each
unit. If you are deploying the T1 Nx64 HTU-R as a
remote unit in a circuit with an ADTRAN
T1 HTU-C, verify that the HTU-C is properly
connected to the HDSL local loop according to the
appropriate ADTRAN T1 HTU-C Installation and
Maintenance Practice.
With units at both ends of the circuit properly
connected to the HDSL local loop, the units will
sync up automatically. When the T1 Nx64 HTU-R
is properly synchronized, the LEDs L1 and L2 will
be
On
(green). If the T1 Nx64 HTU-R is not
properly synchronized, the L1 and/or L2 LEDs will
be
Off
. If the L1 and/or L2 LED is RED, this
indicates that the loop is synchronized, but the
signal quality or loop loss is marginal.
Once the T1 Nx64 HTU-R is synchronized, you can
check the signal quality and loop loss for both
Loop 1 and Loop 2. To do this, first be sure that the
LCD displays the top level screen, then follow the
procedure below.
• Scroll by pressing the up or down arrow
buttons until the cursor is at the “1)
STATUS” selection.
• Press the “ENTER” button.
• Scroll to the “1) HDSL STATUS” selection.
Press “ENTER.”
• Scroll to the “1) Signal Quality” Selection.
Press “ENTER.”
• Scroll to view the signal quality indication
for Loop 1 and Loop 2.
The signal quality indication should be between 7
and 9 for an error free circuit. Any signal quality
indication less than 7 indicates the possibility of bit
errors.
The Loop Loss value can be displayed by executing
the following procedure.
• Scroll by pressing the up or down arrow
buttons until the cursor is at the “1)
STATUS” selection.
• Press the “ENTER” key.
• Scroll to the “1) HDSL STATUS” selection.
Press “ENTER.”
• Scroll to the “2) Loop Loss” Selection.
Press “ENTER.”
• Scroll to view the Loop Loss value for Loop
1 and Loop 2.
A loop loss value of 27dB or less indicates proper
HDSL loop length. Any loop loss value greater than
27dB indicates that the HDSL loop is too long and
the circuit is prone to make bit errors.
Connecting the T1 Nx64 HTU-R to the DTE
You are now ready to connect the DTE to the T1
Nx64 HTU-Rs DTE interface using a customer
supplied cable. The T1 Nx64 HTU-R provides a V.35
interface using a M/34 female type connector. The
pinout of the V.35 connector is shown in
Table 4
.
The T1 Nx64 HTU-R will also support an RS-449
interface using an adapter cable to convert the M/34
female connector to a DB37 female connector.
The pinout for the adapter cable is illustrated in
Figure 6
.
Table 4. V.35 Signal Designations
Pin
Number
Signal Description
A ................... Frame Ground
B ................... Signal Ground
C ................... Request to Send
D ................... Clear to Send
E .................... Data Set Ready
F .................... Carrier Detected
H ................... Data Terminal (DTE) Ready
K ................... Test Mode
P .................... Transmit Data A
R ................... Receive Data A
S .................... Transmit Data B
T .................... Receive Data B
U ................... External Transmit Clock A
V ................... Receive Clock A
W .................. External Transmit Clock B
X ................... Receive Clock B
Y ................... Transmit Clock A
AA ................ Transmit Clock B
NN ................ Test Mode
