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SECTION 1
DESCRIPTION OF EQUIPMENT
1.1
INTRODUCTION
This manual provides general and detailed information on the installation and operation of the Model
F270X FOM II Series Fiber Optic TeleData Modems. Section 1 provides a general description of the
equipment. Section 2 provides installation instructions. Section 3 provides operating instructions. Section 4
provides the theory of operation. Section 5 provides maintenance and troubleshooting information. Figures 1.1
and 1.2 provide an overall view of the Model F270X Tele-Data Modems.
Model
Number
Part
Number
Description
F2702
19685-02
Exchange side tele-data modem for audio and/or RS-485 or RS-422 data,
multimode, 850nm ST optics, 2 Km operational distance.
F2704
19685-04
Exchange side tele-data modem for audio and/or RS-485 or RS-422 data,
multimode, 1300nm ST optics, 8 Km operational distance.
F2705
19685-05
Exchange side tele-data modem for audio and/or RS-485 or RS-422 data,
single mode, 1300nm St optics, 14 Km operational distance.
1.2
DESCRIPTION OF EQUIPMENT
1.2.1
Functional Characteristics
The Model F270X Fiber Optic Modems are designed to be used as an interface extender from a single-
line exchange of a PBX or direct dial service from a telephone company. These units are used with Model
F271X Fiber Optic Modems that provide a subscriber interface. These Modems are designed to transmit
audio (Telephone) and/or data (RS-485 or RS-422) on duplex fiber or 4-wire twisted pair cable (depending on
the application). The main characteristics of Model F270X Tele-Data Modems are:
•
Multiplexes Data (RS-485 or RS-422) and Analog (Telephone audio signal), if desired
•
Transmits multiplexed Data / Audio signal on fiber optic or copper interface cables
Model F270X and F271X Modem pairs use multimode fiber optic cable of up to 2 Km (6,560 ft/1.2 mi)
for 850nm LED optics, up to 8 Km (26,240 ft/5 mi) for 1300nm LED optics, or single mode fiber optic cable
of up to 14 Km (46,200 ft/8.7 mi) for 1300nm ELED optics. If a copper interface is used then up to 1 Km
(3,300 ft/.625 mi) 4-wire twisted pair cable may be used to complete the circuit between the exchange
(F270X) and subscriber (F271X) side modems.
