5.
If the remote BER test indicates that errors
are present, and
the local analog loopback/BER tests showed that both Model
1045RCs were functioning properly, this suggests a problem
with the twisted pair communication line connecting the two
modems. A common problem is improper crossing of the
pairs. Also, verify that the modular connections are pinned
properly, and the twisted pair line has continuity. If you still
have errors, call Technical Support at (301) 975-1007.
5.2.3 USING THE V.52 BER TEST INDEPENDENTLY
The Model 1045RC's V.52 BER test can be used independent of the
V.54 loopback tests. This requires two operators: one to initiate and
monitor the test at both the local and the remote Model 1045RC. To
use the V.52 BER test by itself, both operators should simultaneously
follow these steps:
1.
Locate the lower of the two toggle switches on the front panel
of the Model 1045RC and move it to the right. This will
activate the V.52 BER test mode and transmit a “511” test
pattern to the other unit. If any errors are present, the
receiving modem’s red “Error” LED will blink sporadically.
Note: For this independent test to function, the “511” switch on
both Model 1045RCs must be turned on.
2.
If the test indicates no errors are present, move the V.52
toggle switch to the left, thus activating the “511/E” test with
errors present. If the test is working properly, the receiving
modem’s red “Error” LED will glow. A successful “511/E” test
will confirm that the link is in place, and that the Model
1045RC’s built-in “511” generator and detector are working
properly.
19
APPENDIX A
1045RC SPECIFICATIONS
Transmission Format:
Synchronous or asynchronous,
2-wire or 4-wire
Internal Interface:
Connection to Model 1000R16 rack
chassis via 50 pin male card edge
External Interface:
DB-25 female (RS-232), M/34 female (V.35)
RJ-11 or RJ-45 (line)
Transmission Line:
2-wire or 4-wire unshielded twisted pair
(UTP), 19-24 AWG
Data Rates:
32, 56, 64 Kbps
Clocking:
Internal, external or receive recover
RTS/CTS Delay:
No delay, 7mS, 53mS
Controls:
Carrier constantly “ON” or “controlled by
RTS”
Indicators:
Bi-color LED indicators for TD, RD, RTS &
DCD; single LED indicators for Power, Test
and Error
Diagnostics:
V.52 compliant bit error rate pattern; V.54
compliant— Local Analog Loopback and
Remote Digital Loopback, activated by front
panel switch or via terminal interface
Transformer Isolation:
1500 V RMS
Surge Protection:
Silicon Avalanche Diodes
Temperature:
0-50°C / 32-122°F
Humidity:
4-95%, noncondensing
Dimensions:
0.95”w x 3.1”h x 5.4”l
20
