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Stand-Alone E1/T1 Fiber Converters
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| The WAN products include the FEM and FTM devices The FEM unit includes 1x Fiberoptic E1 modem ( 1xE1 port 120ohm)plus 4 Ethernet ports 10/100TX,and 1 F/O port covering distances up to 150Km ( M/M and SM links) The FTM device contains 1 x T1 port, 4 x 10/100TX ports,and 1 F/O port covering distances up to 150Km Thus the main advantage of these devices is the provided additional Fast Ethernet connectivity, allowing the user to connect its IP traffic with E1/T1 data across the same F/O link. The FEM/FTM unit has been designed to be deployed in pairs so that at each end of the fiber link there is an FEM/FTM device. These unit multiplexes Fast Ethernet data, and E1/T1 data over the fiber trunk; however, the active E1/T1 channel reduces the Ethernet data bandwidth by 3Mbps. AMI or B8ZS bipolar line code can be selected on the T1 copper interface. The FEM/FTM encapsulates E1T1 data into fast Ethernet frames that are transmitted over the fiber link. These E1/T1 frames are given the highest priority; they are transmitted as soon as the transmission of an Ethernet frame is completed. On the receive side, these frames are extracted from the Ethernet data flow and converted into timed E1/T1 signals. A built-in buffer stores incoming Ethernet frames when E1/T1 frames are transmitted. Full 100Mbps data bandwidth is restored when no E1/T1 signals are received. The Ethernet ports can operate in two selectable user modes: LAN mode: as a local switch with a fiber link interface Aggregation mode: each Ethernet port forms with the F/O link a separate traffic path to provide a physical level of security and separation between the users and to allow traffic only between each user and the F/O link (traffic between users is blocked) The LAN/Aggregation selection is performed by means of DIP switch S10 The FEM/FTM is available with a variety of multi-mode and single mode fiber interfaces (distances ranging up to 150km) as well as single-fiber-strand (full bi-directional traffic) models. The FEM/FTM is standard “half-rack” size for economical installation in both rack-mount and desktop modes. It is equipped with a reliable internal switching power supply for extended MTBF. The optional DC power supply facilitates deployment in Telco environments. | |||||
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17445 SW 135th
Place • King City, OR 97224 • 503-579-4362 • Fax: 503-590-2523
• mjewett@ustelecomsupply.com
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