Data Sheet

FOM-E3, FOM-T3
E3/T3 Fiber Optic Modems

Convert E3/T3
electrical signals into

• High-speed fiber optic modems

optical signals,• Transparent to E3/T3 signals

extending the E3/T3• Operate over single mode or multimode fibers

service range up to• Available with laser diode option for extended ranges• Conform to all relevant ITU series standards, including V.54 diagnostics support

110 km (68.3 miles)

The Access Company

FOM-E3, FOM-T3
E3/T3 Fiber Optic Modems

The FOM-E3 and FOM-T3 fiber opticmodems convert E3/T3 electrical signals
into optical signals for transmission overfiber optic cable to extend the E3/T3
service range to up to 110 km(68.3 miles).

The modems are compatible with RAD’s
DXC, Optimux-34, Optimux-45,
FOM-E3/ETH and FOM-T3/ETH devices.

FOM-E3 and FOM-T3 support various
optical interfaces:

Front panel LEDs indicate system faults inthe electrical and fiber optic circuits.

•850 nm VCSEL for multimode fiber•

1310 nm laser for single–mode or
multimode fiber•

1310 nm and 1550 nm long–haullasers for extended range oversingle-mode fiber•

WDM laser for transmission over asingle fiber.

FOM-E3 and FOM-T3 support activation oflocal and remote loopbacks in compliancewith ITU V.54.

Figure 1. LAN Over Fiber E3/T3 Applications

An alarm relay port transmits the following
alarm conditions:•Minor alarm – AIS received at theelectrical or fiber optic interface•

Major alarm – low level of E3/T3
electrical input or high bit error rate at
the fiber optic interface.

Data SheetSpecifications

GENERAL

E3/T3 ELECTRICAL INTERFACE

Diagnostics
Comply with ITU V.54; local and remoteloopbacks activated via slide switch

Transmission Rate
E3: 34.368 Mbps
T3: 44.736 Mbps

PhysicalHeight: 4.4 cm (1.7 in)
Width: 19.4 cm (7.6 in)Depth: 24.3 cm (9.6 in)
Weight: 1.4 kg (3.0 lb)

Alarm Relay PortDry contact via 9-pin, D-type, female
connector. Operates as normally open andnormally closed, using different pins

Impedance
75Ω, unbalanced

Power
AC: 100–240 VAC, 47–63 Hz
DC: –48 VDC, 6.5W
Environment
Temperature: 0°–45°C (32°–113°F)
Humidity: Up to 90%, non-condensing

Indicators
PWR (green): Power status
TEST LOC (yellow): Local loopback is
activeTEST REM (yellow): Remote loopback isactive
OPTICAL AIS (yellow): FO AIS status
OPTICAL ERR (red): FO bit error status
ELECTRICAL LOW (red): Electrical input
statusELECTRICAL AIS (yellow): Electrical AIS
statusZero Suppression
E3: HDB3
T3: B3ZS
Connectors
Two BNC
FIBER OPTIC INTERFACE
Interface Characteristics
See Table 1Connectors
ST, SC, SC-APC or FC

Table 1. Fiber Optic Interface Characteristics
Wavelength[nm]Fiber TypeTransmitter Type[μm]PowerReceiver

Typical Max.

Sensitivity*

Range**

[dBm]

[dBm]

[km]

[miles]850

62.5/125 multimode

VCSEL-15-31

4.5

2.8

1310

62.5/125 multimode

Laser-9-31

5.5

3.4

1310

9/125 single mode

Laser-12-31

38

23.6

1310

9/125 single mode

Laser (long haul)

-2-34

70

43.4

1550

9/125 single mode

Laser-12-31

68

42.2

1550

9/125 single mode

Laser (long haul)

-1-34

110

68.3

1310/1550

9/125 single mode

Laser (WDM), SF1, SF2-12-30

40

24.9

1310

9/125 single mode

Laser (WDM), SF3-12-27

2414.9* Receiver sensitivity is calculated for BER = 10E-9.
** Range is calculated according to the following typical attenuation rates: 3.5 dB/km for 850 nm multimode,
0.5 dB/km for 1300 nm single mode, 0.25 dB/km for 1550 nm single mode. The max. range assumes a margin of 3 dB.

Data Sheet
FOM-E3, FOM-T3
E3/T3 Fiber Optic Modemsb

Optical wavelength and transmitter:
85
850 nm, multimode, VCSEL
13MM 1310 nm, multimode, laser
13L
1310 nm, single mode, laser
15L
1550 nm, single mode, laser
13LH 1310 nm, single mode,long-haul laser
15LH 1550 nm, single mode,long-haul laser
SF1
Tx 1310 nm, Rx 1550 nm,
WDM laser
SF2
Tx 1550 nm, Rx 1310 nm,
WDM laser
SF3
Tx/Rx 1310 nm, WDM laser

FOM-E3/~/ab
FOM-T3/~/ab

Legend~aPower supply type:AC
100 to 240 VAC
48–20 to –72 VDCConnector type:
STST connector
SC
SC connector
FCFC connector
SC-APCSC-APC connector

Note: SC-APC connector can only be ordered withAC power cord
DC connection kit (when DC power supplyis ordered)
OPTIONAL ACCESSORIES
RM-9
Hardware kit for mounting one or two
FOM-E3 or FOM-T3 units in a 19-inch rackSF3 transmitter
Note: SF1 and SF2 transmitters can only be orderedwith SC connector and SF3 transmitter can only beordered with SC-APC connector

Table 2. Fiber Optic Modem Comparison ChartFeature

FOM-E1/T1

Data rates

E1/T1

FOMi-E1/T1
E1/T1

FOM-2019.2–256

FOM-4056–2048

FOMi-40
56–2048[kbps]
DTE interfaces

G.703

G.703

Serial,Serial,

Serial,Ethernet

Ethernet

Ethernet,––FOM-E3FOMi-E3

FOM-E3 ETHFOM-T3

FOMi-T3

FOM-T3 ETH

E3E3

E3

T3

T3

T3

G.703

G.703, HSSI

10/100BaseTVLAN bridge

E1/T1
SNMP–

3

ASM-MN-214

LRS-243–

3–

LRS-24–LRS-24–

management
Card version

ASM-MN-214 ASM-MN-214

for rack

International Headquarters
24 Raoul Wallenberg Street
Tel Aviv 69719, Israel
Tel. 972-3-6458181
Fax 972-3-6498250, 6474436
E-mail market@rad.com

www.rad.com

North America Headquarters
900 Corporate Drive
Mahwah, NJ 07430, USA
Tel. 201-5291100
Toll free 1-800-4447234
Fax 201-5295777
E-mail market@radusa.com

The Access Company

282-100-07/08 Specifications are subject to change without prior notice. © 1988–2008 RAD Data Communications Ltd. The RAD name, logo, logotype, and the terms EtherAccess, TDMoIP and TDMoIP Driven, and theproduct names Optimux and IPmux, are registered trademarks of RAD Data Communications Ltd. All other trademarks are the property of their respective holders.

SUPPLIED ACCESSORIES

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