T3 and HSSI Fiber Optic Modem

• Transparent to T3 and HSSI framing
  
• Redundancy options are available to ensure link up time
  
• Local and remote units can be managed over an inband channel over the fiber link
  
• Includes redundant power supplies
  
• Relays minor and major alarms
  
• System diagnostics and alarms include LED indicators, dry contact, and loop back tests
  
• Setup, control, and diagnostics can be performed via Telnet, ASCII, SNMP, and the RADview management system
  
• Available as a standalone unit or inserted as a module

• Extends the range of equipment with electrical 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-T3 is a T3 and HSSI fiber optic modem that extends the transmission range of electrical T3 over fiber optic cables at a rate of 44.736 Mbps.

Connection to HSSI routers

The standalone version of the modem can optionally support an HSSI DCE interface, which operates at the same rate as the modem type into which it is inserted (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 backbones at T3 rates.

Low-cost extension and conversion of T3 fiber interfaces

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

Wide range of optical interfaces

The optical interface of the 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.

The FOMi-T3 is also available as a card for the LRS-24 19" SNMP-managed rack. The LRS-24 rack can accommodate up to seven 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-T3 units or FOMi- T1 and FOMi-40 units.

Another option for managing a pair of 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.