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SECTION 2
INSTALLATION
2.1
GENERAL
This section contains detailed information on the installation and initial checkout of the Model F271X
FOM II Series Modems. Paragraph 2.2 contains general information on site selection and mounting.
Paragraph 2.3 contains the description for selecting different options on the Modem. Paragraphs 2.4 and 2.5
contain detailed instructions for connecting Model F271X products to your system. Paragraph 2.6 contains
initial checkout procedures.
2.2
SITE SELECTION AND MOUNTING
The Model F270X FOM II modem is designed to be used as an interface extender from a single line
exchange of a PBX or direct dial service from a telephone company. This particular series can also be
connected directly to the serial port (RS-485 or RS-422) of terminal or data communication equipment with a
CAT-5 UTP cable (customer supplied). When connecting the F270X Modem to a PC, Fax, or STU III, the
copper and fiber optic cable should be securely installed so as to prevent accidental disconnection. Care should
be taken to ensure that the copper and fiber optic cables are not mechanically separated from the Modem
during operation. When installed in either desktop chassis or in the dual-card rack mount chassis, space for the
power transformer must also be provided.
2.3
SWITCH AND JUMPER SETTINGS
Internal switches and jumpers are provided to select between available options on the F270X. Switch
and jumper locations are shown in figure 1.5. Switch and jumper settings are as follows:
2.3.1
RS-485 / RS-422 Data Transmission Settings
The F270X Modem has an option of changing the polarity of the transmit or receive data signals at the
RJ45 jack. This eliminates a need to reterminate the UTP cable and change the wiring in a RJ45 plug.
Position
On
Off
SW1-1
Factory setting
*
Factory setting
*
SW1-2
Inverts the phase/polarity for the
RS-485/RS-422 receiver inputs
Normal phase/polarity for the
RS-485/RS-422 receiver inputs
SW1-3
Inverts the phase/polarity for the
RS-485/RS-422 transmitter outputs
Normal phase/polarity for the
RS-485/RS-422 transmitter outputs
SW1-4
Not used
Not used
* Note:
Factory setting for all SW1 positions is Off.
* Note:
Do not set SW1-1 in the On position.
TABLE 2: SW1 SWITCH SETTINGS
