Specifications

December 2008 Page 22–7
Chapter 22. Sub-Rate Data (SRD-2/SRD-4) Module
22
• An HP 1645A Data Error Analyzer (or
equivalent) with an RS-232C cable with a
DB9 male connector
•Up to 14 AWG wire for jumpers
• (Optional) Two modems
To test the data flow through the SRD modules,
complete the following steps:
1. Install the SRD module and interface.
If the module and interface have not been
installed, do so now following the instructions
in the "Installation" section earlier in this
chapter.
When you first install the SRD module in a
live, unlocked chassis, the red/green status
LED is red. If the module is functional, the
status LED turns green within 20 seconds. If
the module is non-functional, the status LED
stays red, even after 20 seconds have elapsed.
This is the first acceptance test.
2. Start the FCS.
Bring up the FOCUS Configuration Software
(FCS) if it is not already running (see
"Starting FCS" in the online help for instruc-
tions).
3. Unlock the FOCUS chassis.
If the chassis is currently locked, execute the
"Unlock Configuration" command on the FCS
Setup menu (see "Unlocking the FOCUS
Chassis" in the online help for instructions).
This puts the chassis into a "changeable" state.
4. Connect your test equipment.
Power up the HP 1645A Data Error Analyzer
(or equivalent). Connect the RS-232C cable
from the test set to the DB9 female connector
for channel A on the SRD interface at the rear
of the "local" FOCUS chassis. On the
"distant" chassis, install two jumpers: one
from pins 2 to 3 (RD to TD); one from pins 7
to 8 (RTS to CTS). Refer to Figure 22-8 for
the pin locations. The jumpers loop the signal
back to the test set.
5. Set the settings on the test set.
Set the settings on the test set as follows:
a) Set the data rate (under the Clock setting)
to 300 bps.
b) Set the Pattern to 2047 (22047).
c) Put the Exponent Range on 9.
d) Make sure the OFF/XMIT ERRORS
switch is in the OFF position.6. Send test
signals and observe the results.
6. Flip the Start switch to run the test.
Observe the results. You should see zero (0)
errors on the test set display. If the test set
reports errors, check the connections, the
module, and the time slot assignments.
Repeat Steps 5-6 several times using different
settings for the data rate. For example, use
settings of 1200, 2400, 4800, and 9600 bps.
Repeat Steps 4-6 for channel B,C & D. Be sure
to connect to the proper channel on both (SRD)
module interfaces.
To test the SRD modules with modems, complete
the following steps:
1. Install the SRD module and interface.
2. Start the FCS.
3. Unlock the FOCUS chassis.
4. Connect the two modems to the modules.
Connect one modem to channel A of the
module interface on one chassis and the other
modem to channel A of the module interface
on the other chassis.
5. Test the modems.
Dial from the "local" modem to see if you can
communicate with the "distant" one. Then
reverse direction, dialing from the "distant"
chassis to the "local" one.
Repeat Steps 4-5 for channel B,C or D as
required.
22.6 Drawings
Component location drawings are located at the
end of this chapter.