Patton electronic 1080A-64 - Manual (Page 24)

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1. If line quality is good, “Error” LED on local modem will not light and
“CD” LED will be red. On remote modem “Error” LED will not light
and “CD” LED will light green.
2. If flat cable is used or parts of the line are flat cable, “Error” LED on
local modem will light red and “CD” LED will light green. On remote
modem “Error” LED will not light and “CD” LED will light green.
3. If one wire from the 4 wire twisted pair is broken “Error” LED will light
red and “CD” LED will light green on at least one modem.
Note We cannot guarantee accurate detection if small pieces of flat
cable are present in the line beyond 1500ft of the local modem.
5.2 ANTI-STREAMING ERROR INDICATOR
When not in test mode (green “Test” LED is off), the front panel “Error”
LED is used to indicate a streaming error. When the Model 1080A Series’
anti-streaming circuitry is enabled, the RTS signal from the DTE is timer
controlled. The timer begins to count when the DTE raises RTS. If the time
period that RTS remains high exceeds the preset time out period, the anti-
stream circuit will force RTS low. The “Error” LED will light red, indicating a
streaming condition (RTS continually on). This feature prevents a malfunc-
tioning terminal from tying-up a computer port in a multi-drop or polling
environment. When the DTE drops RTS, the anti-streaming timer is auto-
matically reset and the front panel “Error” LED turns off. The time out
period is DIP switch selectable for 12.5 or 50 seconds.
5.3 POWER-UP
Apply AC power to the Model 1080A Series by plugging the separate AC
power adapter first into the rear panel of the Model 1080A, and then into
an acceptable AC power outlet. There is no power switch on the Model
1080A; and the remote/normal/loopback switch should be set to “nor-
mal”. When the local and remote Model 1080As are both powered up,
and passing data normally, the following LED conditions will exist:
• TD & RD = flashing red and green
• RTS & DCD = green
• TEST = off