5.3.4 V.52 BER TEST GENERATOR
The Model 1090 has a built-in test pattern generator and detector. It
can be invoked at both ends of a link simultaneously or it can be used
with the Local Analog, Remote Digital or Local Digital Loopbacks. The
following example requires two operators: one to initiate and monitor
the test at the local Model 1090, and one at the remote Model 1090. To
use the V.52 BER test by itself, both operators should simultaneously
follow these steps.
A. Locate the 511/511E toggle switch on the front panel of the
Model 1090 and move it DOWN. This activates the V.52 BER
test mode and transmits a 511 pseudorandom test pattern to
the other unit. If any errors are received, the receiving Model
1090’s red ER LED will blink sporadically.
NOTE: For this test to function, the 511 switch on both Model
1090’s must be on.
B. If the test indicates no errors are present, move the V.52
toggle switch UP, activating the 511/E test. The 511/E test
transmits the 511 pseudorandom test pattern and injects
intentional errors about once per second. If the test is working
properly, the receiving Model 1090’s red ER LED will blink
regularly.
A successful 511/E test will confirm that the link is in place,
and that the Model 1090 built-in 511 generator and detector
are working properly.
C.
This test can be done by one operator by first activating the
local analog loop or remote digital loop.
17
APPENDIX A
1090 SPECIFICATIONS
Transmission
Synchronous
Format
Transmission Line:
Unconditioned twisted pair 19 - 26 AWG
Clocking:
Internal, external or receive loopback
Distance:
Up to 11 miles (19 AWG @ 56 kbps)
Data Rates:
48, 56, 64, 72, 80, 112, 128, 144 and 160
kbps (switch selectable)
Carrier Control:
Constantly on or Controlled by RTS
RTS/CTS Delay:
No delay, short delay (4 - 9 mSec), long
delay (33 - 71 mSec).
Diagnostics:
V.52 compliant bit error rate pattern
(511/511E pattern) generator and detector
with error injection mode; V.54
compliant—local analog loopback and
remote digital loopback, activated by front
panel switch or via serial interface
LED Status
TD, RD, RTS, CD, DTR, ER and TM
Indicators:
(test mode)
Isolation:
Minimum 3000V RMS via transformers
Surge Protection:
600W power dissipation at 1 ms
DCE/DTE Interface: Field-replaceable Quick ConnectTM
modules.
Twisted Pair
8-position modular jack (RJ-45)
Interface:
Power:
115/230 VAC (switch selectable), 50/60 Hz;
85 - 256 VAC, 50/60 Hz (universal input
option); 48 VDC (option). 5 watts.
Temperature
Range:
0-50°C (32-122°F)
Altitude:
0-15,000 feet
Humidity:
5 to 95% non-condensing
Dimensions:
7.3” x 6.6” x 1.62” (185mm x 168mm x
41mm)
Weight:
2.02 lbs. 1.0 Kg
18
