User Manual

AS4000 Release3 and Release 4 Central
Terminal Installation and Commissioning
DLP-017
605-0000-432
Issue 1.3a Date 18th October 1999
Page 5 of 6
Figure 46. Setting Receiver Sensitivity
d) If using a voice test CRU then programme the CRU as follows with the same
programming information as that for the CRU at the ST associated with the
modem under test. If using a Data CRU program the CRU using STMON then go
to step 5(e).
• Remove the cover from the PSU
• Connect an MF or LD type telephone to the NTU
• To program the ST, depress the reset switch, (Type2 SW4 Type 4 SW2), in the
PSU for approximately 3 seconds. LED D8 will begin flashing to indicate the
CRU initialising and self test sequence. After approximately 10 sec, the CRU
initialising and self test sequence will be complete and the LED will be
extinguished. LED D9 will still be illuminated.
• Depress the Programming switch (Type2 SW3 Type 4 SW1). Lift the
telephone handset Off-Hook and wait for the 3 sec continuous “programming
start” tone of 1400 Hz, to be heard in the handset receiver.
• Enter the respective ST programming code on the telephone keypad, within 40
seconds of depressing the install switch. Should an incorrect programming
code be entered, an “incorrect code” tone shall be heard in the handset receiver,
which consists of 1400 Hz pulses for less than 1 sec on, and less than 1 sec off,
for a duration of 5 sec.
• Ensure that at the end of the programming sequence, the “code accepted” tone
is heard in the handset receiver, which consists of 1400 Hz pulses for 1 sec on;
1 sec off, for a duration of 5 sec. Replace the telephone handset.
• Depress the reset switch, (Type2 SW4 Type 4 SW2); The CRU will reset and
re-boot itself in accordance with the programming code entered.
e) At the end of the programming sequence, allow the Test CRU to acquire a RF
link. The RF link has acquired when the Red, RF Link Fail LED is extinguished
on the respective modem under test and the small amber LED’s on the modem
board are on.
f) If using a Voice CRU take the test phone off hook to achieve correct power levels.
A Data CRU automatically acquires at high rate.
g) If necessary adjust the gain control voltage on the Sitespan to achieve a RF Power
level of nominally +5dBm on the RF Power meter. The exact reading should be
8dBm ± 0.5dB minus the measured loss from point B to point C in Figure 45.
Record the voltage and power level on the Test Result Sheet.
h) Place phone on hook.
15. Re-Connecting 2Mbit/s Ports To The Modem Shelf.
Place a loop cable between the 2Mbit/s IN and 2Mbit/s OUT to condition the TU Card
alarm system. Leave loop for about 10 seconds before removing the loop cable.