E3, T3 and HSSI Manageable Fiber Optic Modems

RAD’s FOMi-E3 manageable fiber optic modem and FOMi-T3 manageable fiber optic modem are intelligent, managed fiber optic modems designed for long distance transport of E3, T3, or High Speed Serial Interface (HSSI) signals. Working opposite RAD’s Optimux, ACE and DXC family of products, these modems enable low cost extension and conversion of E3/T3 fiber interfaces to standard electrical interfaces. The FOMi-E3 manageable fiber optic modem and FOMi-T3 manageable fiber optic modem support a wide range of fiber optic interfaces, including long haul and Wave Division Multiplexing (WDM), and can operate over different wavelengths. Redundancy options are available to ensure high levels of link reliability.

• Extends the range of equipment with electrical E3, T3 or HSSI interfaces

• Wave Division Multiplexing (WDM) module for operation over a single-strand fiber optic link, thereby reducing the costs of fiber optic lines

• Wide range of modular optical interfaces

The FOMi-E3 and FOMi-T3 are high speed fiber optic modems that extend the transmission range of electrical E3 or T3 over fiber optic cables:

FOMi-E3 for E3 rates (34.368 Mbps)

FOMi-T3 for T3 rates (44.736 Mbps)

The standalone version of both modems can optionally support an HSSI DCE interface, which operates at the same rate as the modem type into which it is inserted (E3 at 34.368 Mbps and T3 at 44.736 Mbps). The HSSI option also supports bit rates of one-half and one-fourth of the main link rate. This option enables connection of high speed HSSI routers over public backbones at E3 or T3 rates.

The FOMi-E3 and FOMi-T3 can substitute for an ACE, DXC or Optimux unit at the central office that works opposite identical devices at the customer premises, thereby enabling low-cost extension and conversion of E3/T3 fiber interfaces to standard electrical interfaces. When replacing an Optimux device at the central office, the FOMi-E3 or FOMi-T3 enables using one E3/T3 port on the ADM rather than using many E1/T1 ports.

The optical interface of the FOMi-E3 or FOMi-T3 is modular. The modems support the wide range of optical modules supported by the AMC-101 and Optimux. These modules include multimode, single mode, laser, long haul laser, WDM and all types of optical connectors. There is an option to install two optical interfaces for full redundancy of the optical link. There is also an option of dual power supplies for additional redundancy.

 

FOMi-E3 and FOMi-T3 are available as cards for the LRS-24 19" SNMP-managed rack. The LRS-24 rack can accommodate up to seven FOMi-E3 or FOMi-T3 cards, saving cost and space at the central office. RADview, RAD’s SNMP network management system for modem applications, enables management of multiple LRS-24 chassis and the attached remote units. These can be other FOMi-E3 or FOMi-T3 units or FOMi-E1/T1 and FOMi-40 units.

 

Another option for managing a pair of FOMi-E3 or FOMi-T3 modems is with an ASCII terminal connected to the RS-232 connector on the front panel of the standalone unit or on the LRS-24 common logic card. Terminal controls can also be activated from a remote site using a dial-up modem connection.

 

Dry contact alarm relay for activating external alert devices in case of major or minor alarm is available in the FOMi on the rear panel of the standalone modem or on the common logic card of the LRS-24.