5.If the remote BER test indicates that errors are present, and the local analog loopback/BER tests showed that both Model 1018RCs 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)
5.2.3USING THE V.52 BER TEST INDEPENDENTLY
The Model 1018RC'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 1018RC. 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 1018RC and move it to the left. 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 onboth Model 1018RCs must be turned on.
2.If the test indicates no errors are present, move the V.52 toggle switch to the right, 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 1018RC’s
APPENDIX A
PATTON MODEL 1018 RC SPECIFICATIONS
Transmission Format: | Asynchronous to terminals; synchronous |
| between units |
Internal Interface: | Connection to Model 1000R16 rack |
| chassis via male card edge |
External Interface: | |
| (line) |
Transmission Line: | |
| AWG |
Asynchronous Data | 1.2, 2.4, 4.8, 9.6, 19.2, 28.8, |
Rates: | 38.4 and 57.6 Kbps (switch selectable) |
Link Clocking / Sync |
|
Data Rate: | Internal / 76.8 Kbps (fixed) |
RTS/CTS Delay: | No delay |
Controls: | Carrier constantly “ON” or “controlled by |
| DTR” |
Indicators: | |
| DCD; single LED indicators for 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 |
Power Supply: | |
| between 120V and 240V AC; chassis |
| supplies 10V AC to the Model 1018RC, |
| typical consumption is 700mW |
Temperature: | |
Humidity: | |
Dimensions: | 0.95”w x 3.1”h x 5.4”l |
17 | 18 |
