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RAD FOM Fiber Optic Modem Section

FOMi-E3 is an intelligent E3 fiber optic modem

FOMi-E3 is an intelligent E3 fiber optic modem designed for the transparent transmission of E3, HSSI signals over multimode and single mode fiber optic cables. FOMi-E3 intelligent E3 fiber optic modems operate with a wide range of fiber optic interfaces over multimode and single mode fiber optic cables (see Table 1). The modems with E3 electrical interfaces are available with a station clock module that allows them to be synchronized with a central system clock. The station clock E1 is 2.048 Mbps. FOMi-E3 intelligent E3 fiber optic modem operation complies with ITU-T G.703, G.921 and G.956 requirements.

Key points for the FOMi-E3 intelligent E3 fiber optic modem:
- Fiber optic modems, extending the range of E3 or HSSI services over fiber optic cables for up to 110 km (68 miles)
- Transparent to E3 and HSSI framing
- Support a wide range of fiber optic interfaces, including long-haul and WDM options
- Fiber optic redundancy for better service availability
- Operate opposite RAD's Optimux-XLE1 and Optimux-XLE1/16 
- Managed by an ASCII terminal or an SNMP management station
- Support different clock modes, including a station clock
- Relay minor and major alarms
- Include redundant power supplies (optional)
- Available as single modem cards for RADs LRS-24, modem rack with SNMP management (except for HSSI option)

FOMi-E3 is an intelligent E3 fiber optic modem
Four models are available for the FOMi-E3 intelligent E3 fiber optic modem:
FOMi-E3 with E3 interface that operates with 34.368 Mbps internal clock and utilizes HDB3 coding
FOMi-E3/HSSI uses the E3 internal clock and operates at 34.368, 17.184, 8.592 Mbps data rates
FOMi-E3/HSSI and FOMi-T3/HSSI contain an HSSI interface card that acts as an ECL/TTL transceiver and as a DCE interface. These modems do not support the station clock option. 

FOMi-E3 intelligent E3 fiber optic modem supports a wide range of optical interfaces that operate at various wavelengths over single mode and multimode cables. They also support a variety of physical connectors (ST, FC/PC and SC), as detailed in Table 1. A dual fiber optic interface allows full redundancy on the fiber optic transmission. A switchover mechanism is activated immediately upon detection of low optical levels on one of the dual optical links. 

FOMi-E3 operates opposite RADs TDM multiplexers: Optimux-XLE1 or Optimux XLE1/16 which multiplex a combination of E1 and Ethernet ports or up to 16 E1s into a single fiber optic link

Remote FOMi-E3 intelligent E3 fiber optic modems can be managed using an inband channel over the fiber link. The management channel operation does not interfere with the data transmission. Available also as single modem cards for RADs LRS-24, 19-inch SNMP-managed modem rack. LRS-24 accommodates up to ten modem cards without redundant fiber link. If the modems have a redundant fiber optic link, the maximum number of cards is seven.
The modem cards and attached FOMi-E3 intelligent E3 fiber optic modem units can be managed via RADview, RAD's SNMP network management system. The standalone units are also managed via an ASCII terminal.

DTE INTERFACES of the FOMi-E3 intelligent E3 fiber optic modem
Data Rates
- E3: 34.368 Mbps
- HSSI-E3: 8.592, 17.184 or 34.368 Mbps
Line Codes
E3: HDB3
E3: 75O
HSSI: 110O
E3: According to ITU-T Rec. G.703
HSSI: 2m (6.5 feet), nominal
E3: Two shielded BNC
connectors (unbalanced)

Applicable Standard
ITU-T Rec. G.956
Line Code
Specifications and Ranges
See Table 1
Redundancy options
Additional link is optional

Input Data Rate: E1: 2.048 Mbps
Line Code: AMI or Square
Impedance: 75O, unbalanced
Two shielded BNC

FOMi-E3 intelligent E3 fiber optic modem general information
Loopbacks: Local analog (LLB), Remote digital (RLB), Local digital loopback (DIG), Dual LLB+DIG (DLB) Router loopback (LC), for units with HSSI interface only
Statistics collection:
BPV (electrical), LCE (fiber optic), PSES (electrical and fiber optic), UAS (electrical and fiber optic)
Control Port: V.24 (RS-232) DTE, operating at 9.6 kbps to 115.2 kbps, Control Port Connector D-type, 9-pin, female
Alarm Relay Port
Dry contact via 9-pin, D-type, female connector. Operates as Normally Open and Normally Closed, using different pins.

AC: 100 to 240 VAC (10%), 47 to 63 Hz
DC: 24 VDC (10%) or -48 VDC (10%)
Number of Power Supplies: One or two (power sharing)
Power Consumption: 15W maximum (for one or two power supplies) 

Physical- Height: 44.0 mm / 1.7 in, Width: 426.8 mm / 16.8 in, Depth: 258.0 mm / 10.5 in, Weight 2.5 kg / 5.5 lb

Temperature: 050C/32122F
Humidity: Up to 90%,

Ordering Options:
FOMi-E3/*/#/$/^ E3 and HSSI manageable fiber optic modem
FOMi-E3CF/#/$/& E3 manageable fiber optic modem card for LRS-24 ETSI version
FOMi-E3CB/#/$/& E3 manageable fiber optic modem card for LRS-24 ANSI version

* Specify power supply:
AC for 110230 VAC
ACR for redundant 110230 VAC
24 for 24 VDC
24R for redundant 24 VDC
48 for -48 VDC
48R for redundant -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
13MM for 1310 nm, multimode, LED
13L for 1310 nm, single mode, laser diode
13LH for 1310 nm, single mode, long haul laser diode
15L for 1550 nm, single mode, laser diode
15LH for 1550 nm, single mode, long haul laser diode
SF1 for 1310 nm transmit and 1550 nm receive
SF2 for 1550 nm transmit and 1310 nm receive
Note: For single fiber connection (WDM) one of the devices must be ordered with an SF1 interface and the other with an SF2 interface.

$ Specify R for redundant fiber optic link (see # and &, above, for options)
^ Specify station clock or HSSI: STC for station clock (not available for units with HSSI interface) HSSI for HSSI (standalone units only)

FOMi-T3 intelligent T3 fiber optic modem data sheet (pdf)

Immediate price quote - Call 727-398-5252 or e-mail cs@bestdatasource.com

Don't forget to ask about  RADCare support for your RAD products.

Other RAD sections of interest:
RAD Accessories, RAD ATM products, RAD Baseband modems and last mile access, RAD Cables & Misc, RAD Digital Service Access Devices ( FCD ), RAD Fiber Optic modems and Converters, RAD IP and Ethernet Access, RAD Kilomux Data, Voice, Fax and LAN integrating Multiplexers, RAD LRS Modem rackRAD MegaplexRAD Networks Management, RAD Optimux Fiber MultiplexersRAD Sharing Devices, RAD Short Range ModemsRAD T1/E1 Digital Cross Connects ( DACS ), RAD T1/E1 Digital Cross Connect (DACS) for single E1 / T1 applications, RAD TDMoIP, RAD Voice Interface Converters, RAD Voice Trunking Gateway

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Last modified: January 17, 2015
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