Data Sheet

FOM-E1/T1
E1/T1 Fiber Optic Modem

Converts E1/T1electrical signals into
optical signals toextend the range ofE1/T1 service up to144 km (89.4 miles)• Extended range with optional laser diode• Transparent to E1/T1 framing• Compatible with RAD's DXC cross-connect systems, FCD access units, and Megaplex
access multiplexers• ITU standards compliant

The FOM-E1/T1 fiber optic modem
converts E1/T1 electrical signals into
optical signals for transmission over fiber
optic cables to extend the E1/T1 service
range of up to 144 km (89.4 miles).

FOM-E1/T1 features various opticalinterfaces:•

850 nm for multimode fiber•

1310 nm for multimode fiber•

1310 nm for single-mode fiber•

1550 nm for extended range oversingle-mode fiber.

The Access Company

FOM-E1/T1
E1/T1 Fiber Optic Modem

FOM-E1/T1 operation complies with ITU
G.703 and G.955 standards.

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

An alarm relay port transmits the following

The modem features local and remoteloopbacks.

alarm conditions:•Major alarm – Low level of E1/T1electrical input or high bit error rate at

FOM-E1/T1 is also available as a plug-in
card for RAD’s 19-inch modem rack,
ASM-MN-214.

the fiber optic interface•Minor alarm – AIS received at electricalor fiber optic interface.

Figure 1. Point-to-Point Application

Table 1. FOM-E1/T1 Fiber Optic Interface Characteristics
Option Wavelength85

Fiber TypeTransmitter Type

[nm]

[μm]

850

62.5/125 multimode VCSEL/LED
VCSEL

Typical Power

Receiver Sensitivity

[dBm]

[dBm]

-18 (FOM-E1/T1/R) -35 (FOM-E1/T1/R)-7 (FOM-E1/T1)-32 (FOM-E1/T1)

Connector

ST, SC, FC

Typical Max.
Range

[km]

[mi]

4.8

3.0

6.7

4.2

13MM

1310*

62.5/125 multimode LED-18-31

ST, SC

9.3

5.713L1310

9/125 single mode

Laser-12-40

ST, SC, FC

50.0

31.0

13LH

1310*

9/125 single mode

Laser (long haul)-2-40

ST, SC, FC

70.0

43.4

15L

1550

9/125 single mode

Laser-12-38

ST, SC, FC

92.0

57.0

15LH

1550*

9/125 single mode

Laser (long haul)-1-40

ST, SC, FC

144.0

89.4

SF1

1310/1550* 9/125 single mode

Laser (WDM), SF1-12-34

SC

38.0

23.6

SF21550/1310* 9/125 single mode

Laser (WDM), SF2-12-34

SC

38.0

23.6

SF31310*Laser (single fiber), SF3 -12-27

SC/APC

20.0

12.4

*

9/125 single mode

Available in standalone version only.

Data Sheet

GENERAL

Specifications

Power (Standalone only)

Diagnostics
E1/T1 ELECTRICAL INTERFACE

Local and remote loopbacks activated via
back panel DIP switch

Transmission Rate
E1: 2.048 Mbps
T1: 1.544 Mbps

Power Consumption

Alarm Relay PortDry contact via 9-pin, D-type, female
connector

Zero Suppression
E1: HDB3
T1: B8ZS, AMI

Physicalalarm relay port.

Height: 4.37 cm (1.7 in)
Width: 24.0 cm (9.4 in)
Depth: 17.0 cm (6.7 in)
Weight: 0.5 kg (1.1 lb)

PWR (green) – power status
LLB (yellow) – local loopback status
RLB (yellow) – remote loopback status
OPTICAL AIS (yellow) –"all 1s" stringreceived at the fiber optic interface
OPTICAL LOSS (red) – BER is over 10–6
ELEC LOSS (red) – electrical interface input
is below G.703 level
ELEC LOSS (red) – electrical interface input
is below G.703 level
ELEC AIS (yellow) – "all 1s" string received
at the electrical interface

E1: 75Ω, unbalanced or120Ω, balanced
T1: 100Ω, balanced
E1 Interface Connectors
RJ-45, balanced
BNC, unbalanced
FIBER OPTIC INTERFACE
See Table 1

AC: 8 VA max
DC: 4W max

Note: The card version uses the ASM-NN-214

Indicators

Impedance

Wide range: 100–240 VAC or–40 to –60 VDC
DC only: 24 VDC

Environment
Temperature: 0°–50°C (32°–122°F)
Humidity: Up to 90%, non–condensing

Table 2. Fiber Optic Modem Comparison ChartFeature
Max. Data Rate

FOM-E1/T1

FOMi-E1/T1

FOM-20

FOM-40FOMi-40

FOM-E3/T3

FOMi-E3/T3

FOM-E3/T3 ETH

E1/T1

E1/T1

19.2–256

56–2048

56–2048

E3/T3

E3/T3

E3/T3

G.703

G.703

Serial,Serial, Ethernet

Serial,G.703

G.703, HSSI

10/100BaseT[kbps]
Interfaces

Ethernet

Ethernet,

VLAN Bridge

E1/T1
Laser Diode

3

3

3

3

3

3

3

Option
SNMP333

LRS-24LRS-24

Management
Card Versionfor Rack

ASM-MN-214

LRS-24

ASM-MN-214

ASM-MN-214

3Data Sheet
FOM-E1/T1
E1/T1 Fiber Optic Modem&FOM-E1/T1/*/#/&
E1/T1 standalone fiber optic modem
FOM-E1/T1/R/#/&E1/T1 fiber optic modem, card version for
ASM–MN–214 modem rackLegend*#Power supply:AC
100 to 240 VAC
48V –40 to –60 VDC
24V 24 VDC
Fiber optic connector:
STST connector
SC
SC connector
FC
FC connector

Optical wavelength, fiber andtransmitter (see Table 1)85
850 nm, multimode, VCSEL
13MM 1310 nm, multimode, LED(standalone only)
13L
1310 nm, single mode, laser
diode
13LH 1310 nm, single mode, laser
diode, long haul (standaloneonly)
15L
1550 nm, single mode, laser
diode
15LH 1550 nm, single mode, laser
diode, long haul (standaloneonly)
SF1
WDM single fiber, 1310 nm Tx(standalone only)
SF2
WDM single fiber, 1550 nm Tx(standalone only)
SF3
single fiber, 1310 nm Tx/Rx(standalone only)

RM-33-2
Hardware for mounting one or two
FOM-E1/T1 standalone units in a 19-inch
rack

Note: When ordering SFx options, do not
specify the fiber optic connector type #.

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

Order this publication by Catalog No. 801204

The Access Company

284-100-05/09 Specifications are subject to change without prior notice. © 1987–2009 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.

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