| Technical Data
GENERAL DESCRIPTION
VERSITRON FOM II Series TeleData Modems are used to extend a telephone and/or data (RS-485 or RS-422) link on duplex fiber optic cable or 4-wire twisted pair cable. The F270x functions as the exchange side modem while the F271x functions as the subscriber side modem. For intercom or ring-down applications, the F271x is used at each end of the connection. An RJ11 provides the copper interface for the telephone and/or data input. ST connectors are standard for the fiber optic interface. Several different configurations are offered to accommodate a wide variety of fiber optic needs. The operation of each modem is fully transparent.
 These modems are available with 850nm multimode (MM) LEDs for distances up to 2km (1.25 mi/ 6,600 ft), with 1300 MM LEDs for distances up to 8 km ( 5 mi / 26,400 ft), or with 1300nm single mode (SM) LEDs for distances up to 14 km (8.7 mi / 46,000 ft). If the copper interface is utilized then up to 1 km (.625 mi/ 3,300 ft.) 4-wire twisted pair cable may be used to complete the circuit. ST connectors are standard. Housing options include either single card or dual card standalone enclosures, and 2-slot or 20-slot 19" rack mount chassis. The 20-slot chassis is powered by AC150W power supplies and may utilize 2 power supplies for redundancy. Each modem installed in either the single or dual card enclosures or in the 2-slot chassis requires an AC to DC power adapter.
FEATURES
VERSITRON Models' F270X and F271X digitizing process allows a transparent fiber optic link. This digitizing process also provides a reliable optical isolation for use with STU IIIs up to 9600 baud data transmission. Other features include:
- Intercom or ring down application with two model F271X subscribers
- 850nm multimode, 1300nm multimode, and 1300 nm single mode options
- Line impedance option of 600
 or 900
- Multiplexes voice and data (RS-422 or RS-485) for copper or fiber transmission
Annunciator lights are used as status indicators on Models F270X and F271X modems primarily for the telephone link status. Their function is as follows:
PWR--Power on indication for normal operation
HOOK--Off-hook indication
RING--Ringing signal indication
LOOP--Loop current detect indication
RBAT--Reverse battery detect indication
ALM--Out of sync indication
SELECTION GUIDE
|
F270X/F271X
|
| Model |
F2702/F2712
|
F2704/F2714
|
F2705/F2715
|
| Wavelength |
MM 850nm LED
|
MM 1300nm LED
|
SM 1300nm LED
|
| Connector |
ST
|
ST
|
ST
|
| Operating Distance |
2 km
|
8 km
|
14 km
|
TECHNICAL SPECIFICATION
General
| Model |
F270x/F271x* |
| Dimensions |
(7" H x 0.9" W x 11.7" L)
(17.8 x 2.3 x 29.7 cm) |
| Weight |
0.28 kg (10.0 oz) |
| Operating Temperature |
0° to 50°C (32° to 122°F) |
| Storage Temperature |
-40° to 70°C (-40° to 158°F) |
| Humidity |
Up to 95% relative humidity (non-condensing) |
| Altitude |
Up to 10,000 ft. |
| *Note: x is replaced with 2 for 850nm MM LED; 4 for 1300nm MM LED; or 5 for 1300nm SM LED |
ELECTRICAL INTERFACE
| Model |
F270x/F271x* |
| Power Requirements |
12VDC / 1.0A |
| Connector (Tip & Ring) |
RJ11, 2-wire Twisted Pair |
| Copper Interface Connector |
RJ11, 4-Wire Twisted Pair |
| Data Transmission Connector |
RJ45, CAT5 UTP |
| Audio Signal |
Analog, 300Hz to 3.4 Khz |
| Data Signal |
RS-485 or RS-422 (asynchronous or isochronous) up to 64Kbps |
| Idle Channel Noise |
-55 dBm |
| In-band Spurious |
-40 dBm |
| Out-band Spurious |
-30 dBm |
| Talk Battery |
45 to 55VDC |
| Loop Current |
20mA max ( off hook) |
| Ring Signal |
80-150VAC, 15 to 68Hz |
| Line Impedance |
600 or 900 |
| *Note: x is replaced with 2 for 850nm MM LED; 4 for 1300nm MM LED; or 5 for 1300nm SM LED |
FIBER OPTIC INTERFACE
| Model |
F2702/F2712
|
F2704/F2714
|
F2705/2715
|
| Wavelength |
Multimode 850nm LED
|
Multimode 1300nm LED
|
Single Mode 1300nm LED
|
| Connector |
ST
|
ST
|
ST
|
| Link Budget |
-20 ± 1 dB
|
-20 ± 1 dB
|
-14 ± 1 dBm
|
| Operating Range |
2km / 1.25mi / 6,600ft
|
8km / 5mi / 26,400ft
|
14km / 8.7mi / 46,000ft
|
| Fiber Cable |
50/125, 62.5/125, 100/140µM**
|
50/125, 62.5/125, 100/140µM**
|
8/125, 9/125, 10/125µM***
|
| **Multimode tests were performed on 62.5/125µM fiber cable. ***Single Mode tests performed on 9/125µ fiber cable. |
| ***Single Mode tests were performed on 9/125µM fiber optic cable. |
ACCESSORIES
|
Model #
|
Description
|
Weight
|
|
HF-1
|
Single card standalone enclosure. 7.1W x 1.3H x 11.6L in (18W x 3.3H x 29.5L cm) |
0.5 kg ( 18 oz)
|
|
HF-2
|
Dual card standalone enclosure. 7.1W x 2.3H x 11.6 L in (18W x 5.9H x 29.5L cm) |
0.7 kg ( 24 oz)
|
|
HF-2SS
|
2-slot 19" rack mount chassis. 19W x 1.7H x 13.8L in (48.3W x 4.3H x 35.1L cm) |
1.2 kg ( 40 oz)
|
|
HF-20
|
20-slot 19" rack mount chassis. 19W x 7.1H x 11.6L in (48.3W x 18H x 29.5L cm) |
2.1 kg ( 73 oz)
|
|
AC150W
|
Power supply / system monitor. Two are required for power redundancy. (Used with HF-20) |
1.2 kg ( 43 oz)
|
|
ADPHF01
|
Blank panel, single slot. |
0.05 kg ( 2 oz)
|
|
ADPHF02
|
Blank panel, double slot. |
0.09 kg ( 3 oz)
|
|
PSAC08
|
Power adapter, 110vac to 12vdc/1.0A, (US). (Used with HF-1, HF-2, and HF-2SS.) |
0.4 kg ( 14 oz)
|
|
PSAC09
|
Power adapter, 220vac to 12vdc/1.0A, (VDE). (Used with HF-1, HF-2, and HF-2SS.) |
0.4 kg ( 14 oz)
|
|
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