RAD FOM-E1/T1 fiber modem specifications

RAD T1 Fiber Optic Modem

The FOM-E1/T1 fiber optic modem converts an E1/T1 electrical signal into an optical signal. After the conversion, the signal is transmitted over fiber optic cable, extending the E1/T1 service range up to 100 km (62 miles).

The FOM-E1/T1 is transparent to E1/T1 framing (G.704), which enables it to transmit framed or unframed E1/T1 signals.

Using the FOM-E1/T1 opposite the DXC cross connect system, Megaplex access multiplexer or FCD access unit reduces the cost of the fiber optic link when accessing the SDH/SONET network.

The FOM-E1/T1 supports various optical interfaces: - 850 nm for multimode fiber - 1310 nm for single mode or multimode fiber - 1550 nm laser diode for extended range over single mode fiber.

FOM-E1/T1 operation complies with ITU G.703, G.921 and G.956 standards. The modem supports activation of local and remote loopbacks in compliance with the ITU V.54 standard.

T1 Fiber Modem - FOM-T1

Specifications

The FOM-T1/E1 T1 fiber modem extends the range of a T1 or E1 circuit over fiber.

Using 1550nm single mode the FOM-T1 has a maximum range of 62 miles

The FOM-T1 is transparent to T1 framing

It can operate over single mode or multimode fiber using 850nm or 1300nm LEDs, 1300 nm laser diode or 1550 nm laser diode

ITU standard compliant with G.703 and G.955

For point-to-multipoint applications it is available in a card version with a managed rack

V.54 diagnostics for local and remote digital loop-backs

Relays major and minor alarms

Front panel LED indicators

FEATURES

• Fiber optic modem, extending the range of E1/T1
services over fiber optic cables up to 100 km (62 miles)

• Transparent to E1/T1 framing (G.704)

• Operates opposite RAD's DXC cross-connect system,
Megaplex access multiplexers and FCD access units

• Available with laser diode option for extended ranges

• Conforms to all relevant ITU series standards, including
V.54 diagnostics support

• Operates over single mode or multimode fibers

• Relays minor and major alarm conditions

• Includes front panel LED indicators for status monitoring

DESCRIPTION

• The FOM-E1/T1 fiber optic modem converts an E1/T1 electrical signal into an optical signal. After the conversion, the signal is transmitted over fiber optic cable, extending the E1/T1 service range up to 100 km (62 miles).

• FOM-E1/T1 supports various optical interfaces:
850 nm for multimode fiber
1310 nm for single or multimode fiber
1550 nm for extended range over single mode fiber.

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

• The modem supports activation of local and remote loopbacks in compliance with ITU V.54.

• Alarm relay port transmits the following alarm conditions:
Major alarm . Low level of E1/T1 electrical input or high bit error rate at the fiber optic interface Minor alarm . AIS received at electrical or fiber optic interface.

• Front panel LEDs indicate system faults in the electrical and fiber optic circuits.

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

SPECIFICATIONS

E1/T1 ELECTRICAL INTERFACE

Transmission Rate
E1: 2.048 Mbps
T1: 1.544 Mbps
Zero Suppression
E1: HDB3
T1: B8ZS
Impedance
E1: 75. unbalanced or 120. balanced
T1: 100. balanced
Connectors
Balanced: 15-pin D-type, female
Unbalanced: two BNC

FIBER OPTIC INTERFACE

Specifications and Ranges
See Table 1
Connectors
ST, SC or FC/PC (see Ordering)

GENERAL
Diagnostics
Complies with ITU V.54; local and remote loopbacks activated via front panel slide switch
Indicators
PWR . ON when the unit is powered up
OPTICAL AIS . ON when "all 1s"
string is received at fiber optic
interface
OPTICAL ERR . ON when bit
error rate is 10-6 or worse
ELECTRICAL LOW . ON when
electrical interface input is
below G.703 level
ELECTRICAL AIS . ON when
"all 1s" string is received at
electrical interface
Alarm Relay Port
Dry contact via 15-pin, D-type,
female connector.
Operates as Normally Open and
Normally Closed, using different
pins.
Power
AC: 115 or 230 VAC (±10%),
47 to 63 Hz, 6W
DC: 24 VDC (±10%) or
-48 VDC (-36 to -72 VDC)
Physical
Height: 4.4 cm / 1.7 in
Width: 17.9 cm / 7.0 in
Depth: 20.3 cm / 8.0 in
Weight: 1.1 kg / 3.0 lb
Environment
Temperature: 0.50°C/32.122°F
Humidity: Up to 90%,
non-condensing

*FOM-E1/T1//#/&**
E1/T1 fiber optic modem
FOM-E1/T1/R/#/&
E1/T1 fiber optic modem, card version for ASM-MN-214 card cage
*	Specify power supply:
	115 for 115 VAC
	230 for 230 VAC
	24 for 24 VDC
	48 for -48 VDC
#	Specify fiber optic interface type
	(# for connector type, followed by & for optical wavelength):
	ST for ST type connector
	SC for SC type connector
	FC for FC/PC type connector
&	85 for 850 nm, multimode, VCSEL
	13 for 1310 nm, single mode, LED
	13L for 1310 nm, single mode, laser diode
	15L for 1550 nm, single mode, laser diode
RM-9
Special hardware for mounting one or two FOM-E1/T1 units in a 19-inch rack

see part numbers for ordering

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