Versitron F2702, F2704, F2712, F2714, F2705 Technical Manual
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F270X
Fiber Optic
Tele-Data Modem
Technical Manual
Revision B
Copyright May 2002
VERSITRON, Inc.
83 Albe Drive / Suite C
Newark, DE 19702
www.versitron.com
A020519685
PROPRIETARY DATA
All data in this manual is proprietary and may not be disclosed,
used or duplicated, for procurement or manufacturing purposes,
without prior written permission by VERSITRON, Inc.
WARRANTY
All VERSITRON products purchased after January 2001 are warranted against defects in materials and workmanship for
the lifetime of the product. Purchases made prior to January 2001 are warranted for a period of one year from date of
delivery. VERSITRON reserves the right to repair or, at our option, replace parts which during normal usage prove to be
defective during the warranty period provided that:
1. You call VERSITRON at (302) 894-0699 or (800) 537-2296 and obtain a Return Maintenance Authorization
(RMA) number. Please reference your RMA number on the outside of the shipment box.
2. Shipping charges are pre-paid.
No other warranty is expressed or implied and we are not liable for consequential damages. For repairs outside
of the warranty period, the same procedure must be followed.
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TABLE OF CONTENTS
PARAGRAPH TITLE PAGE
SECTION 1: DESCRIPTION OF EQUIPMENT
1.1 INTRODUCTION .......................................................................................................... 1
1.2 DESCRIPTION OF EQUIPMENT................................................................................. 1
1.2.1 Functional Characteristics ................................................................................................. 1
1.2.2 Audio and Data Transmission Characteristics .................................................................... 2
1.2.3 Physical Characteristics..................................................................................................... 2
1.3 TELE-DATA MODEM SPECIFICATIONS................................................................... 5
SECTION 2: INSTALLATION
2.1 GENERAL ...................................................................................................................... 6
2.2 SITE SELECTION AND MOUNTING.......................................................................... 6
2.3 SWITCH AND JUMPER SETTINGS............................................................................. 6
2.3.1 RS-485 / RS-422 Data Transmission Settings ................................................................... 6
2.3.2 Fiber Optic or Copper Transceiver Network Settings........................................................ 7
2.3.3 Interface Impedance Selection.......................................................................................... 7
2.3.4 Default Jumper ................................................................................................................. 8
2.4 POWER REQUIREMENTS............................................................................................ 8
2.4.1 Installation with AC Power ............................................................................................... 8
2.4.2 Installation with DC Power ............................................................................................... 8
2.5 INTERFACE WIRING................................................................................................... 9
2.5.1 Fiber Optic Cable Installation............................................................................................10
2.6 INITIAL CHECKOUT PROCEDURE............................................................................10
3.1 INTRODUCTION ..........................................................................................................11
3.2 STATUS INDICATORS / AUDIBLE ALARM...............................................................11
SECTION 3: OPERATION
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SECTION 4: THEORY OF OPERATION
PARAGRAPH TITLE PAGE
4.1 INTRODUCTION ..........................................................................................................12
4.2 POWER SUPPLY AND ALARM CIRCUITRY.............................................................12
4.2.1 Power Supply Circuit........................................................................................................12
4.2.2 Alarm Circuit....................................................................................................................12
4.3 FUNCTIONAL DESCRIPTION ....................................................................................13
4.3.1 Ring Detection..................................................................................................................13
4.3.2 Loop Current Detection Circuit.........................................................................................13
4.3.3 Reverse Battery Detection Circuit .....................................................................................13
4.3.4 Analog-to-Digital Conversion............................................................................................13
4.3.5 CPLD (Mux / Demux)......................................................................................................13
4.3.6 RS-485 / RS-422 Data Transmission Circuit.....................................................................14
4.3.7 Fiber Optic / Copper Transceiver Circuit ..........................................................................14
SECTION 5: MAINTENANCE AND TROUBLESHOOTING
5.1 INTRODUCTION ..........................................................................................................15
5.2 FAULT ISOLATION......................................................................................................15
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LIST OF ILLUSTRATIONS
FIGURE TITLE PAGE
1.1 FRONT VIEW, F270X MODEM ................................................................................... 3
1.2 REAR VIEW, F270X MODEM ...................................................................................... 3
1.3 BACK PANEL, F270X MODEM................................................................................... 3
1.4 APPLICATION EXAMPLE ........................................................................................... 4
1.5 SWITCH AND JUMPER SETTINGS............................................................................. 8
1.6 DC POWER SUPPLY CONNECTIONS....................................................................... 8
LIST OF TABLES
TABLE TITLE PAGE
1. DIMENSIONS OF ENCLOSURES AND CHASSIS .................................................... 2
2. SW1 SWITCH SETTINGS............................................................................................. 6
3. JP4 JUMPER SETTINGS ............................................................................................... 7
4. SW2 SWITCH SETTINGS............................................................................................. 7
5. LINE IMPEDANCE JUMPER SETTINGS ................................................................... 7
6. (J4) TELEPHONE / ANALOG WIRING........................................................................ 9
7. (P1) CHASSIS POWER / ALARM WIRING................................................................. 9
8. (J1) RS-485 / RS-422 DATA TRANSMISSION WIRING............................................10
9. COPPER INTERFACE WIRING...................................................................................10
10. STATUS INDICATORS.................................................................................................11
11. NONOPERATIONAL INDICATORS ...........................................................................15
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1.1 INTRODUCTION
Number
Number
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.
SECTION 1
DESCRIPTION OF EQUIPMENT
Model
F2702 19685-02
F2704 19685-04
F2705 19685-05
Part
Exchange side tele-data modem for audio and/or RS-485 or RS-422 data,
multimode, 850nm ST optics, 2 Km operational distance.
Exchange side tele-data modem for audio and/or RS-485 or RS-422 data,
multimode, 1300nm ST optics, 8 Km operational distance.
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 singleline 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:
Description
• 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.
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