5.0 OPERATION
Once you have configured each Model 1180/35 properly and
connected the fiber and V.35 cables, you are ready to operate the units.
This section describes reading the LED status monitors, power-up, and
using the built-in loopback test modes.
5.1 LED STATUS MONITORS
The Model 1180/35 features six front panel status LEDs that
indicate the condition of the modem and communication link. Figure 6
(below) shows the front panel location of each LED.
• The green "Power" LED glows if power is applied to the modem.
• The green "Test Modes" LED indicates that the modem is in a test
mode (local analog or remote digital).
• The "TD" and "RD" indicators blink red and green with data activity.
Red indicates a low V.35 logic level, green indicates a high V.35
logic level. Note: V.35 devices idle in a low state, so the LED will
glow red if the connections are correct and the V.35 device is in an
idle state.
• The "RTS" and "CD" indicators are also tri-state and will glow red for
a "low" signal or green for a "high" signal. RTS lights for an
incoming signal on V.35 pin C. CD lights for an incoming signal on
the line side, and the resulting output signal on V.35 pin F.
4.0 INSTALLATION
The Model 1180/35 is easy to install. After configuring the DIP
switches, simply connect the single fiber cable, hook up the V.35
interface, and plug the power supply adapter into the 1180/35. Figure 4
(below) shows the location of the interface connections on the Model
1180/35 rear panel.
4.1 SINGLE FIBER CONNECTION
These short range modems are designed to work in pairs. You will
need one at each end of single multi-mode fiber cable. Depending
upon the data rate setting you select, your cable may be a maximum of
1.5 or 3 miles long. The fiber cable connects to each Model 1180/35
using either an ST or an SMA connector. Figure 5 (below) shows a
close-up of both connector types.
4.2 V.35 CONNECTION
The Model 1180/35 is configured as a DCE. Therefore it “wants” to
DTE hardware such as a PC, host or terminal, using a straight through
V.35 cable. Connecting the Model 1180/35 to DCE hardware such as a
modem, multiplexer, or printer, requires a null modem V.35 cable.
Contact Patton Technical Support at (301) 975-1007 for more
information about constructing the appropriate null modem cable for
your application.
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7
Figure 6. Front view of Model 1180/35
Figure 4. Rear Panel of Model 1180/35 Showing Interface Connections
Figure 5. Close-up of ST and SMA Connections
alignment pin
faces down
