LV2000 - Ethernet to EIA644/LVDS Converter PDF Print E-mail

The Metrodata LV2000 enables the transmission of LAN frames over an EIA-644/LVDS connection.

LV2000 offering an Ethernet service over an LVDS  encrypter and satellite modem

LV2000 offering an Ethernet service over an LVDS encrypter and satellite modem

This application shows an LV2000 offering an Ethernet service over an LVDS encrypter and satellite modem. LVDS modems are generally a low cost alternative to HSSI modems for data rates up to 52Mbps. The latest generation of high speed LVDS encrypter units (such as the KIV-7M) are also supported via an automatic crypto resync function, that will generate a resync request to the encrypter if the LV2000 senses the data stream has lost synchronisation. To give maximum flexibility for connection to encrypters, the resync request signal may be active high or active low, and be presented as a balanced LVDS or unbalanced LVTTL signal.

The LAN interface is auto-sensing and supports 10M, 100M, full or half duplex operation. Manual selection of 100BaseT FD operation enables connection to fixed configuration router ports. The LAN interface has an RJ45 connector and offers automatic MDI/MDI-X interface selection to remove the need for cross-over cables. An efficient HDLC encapsulation is used which has address learning and filtering at up to 148810 packets per second. Rate decoupling is supported by means of a 1000 packet SDRAM buffer store, and no packets are lost providing that the sustained data rate is below the DTE serial port speed.

The LVDS modem interface is presented as a DTE and will operate at data rates of up to 52Mbps in each direction, since it is clocked using the Send Timing and Receive Timing signals supplied by the DCE port on the connected modem. The LV2000 will operate in a standard bi-directional, symmetric mode as well as uni-directional or asymmetric applications. The LVDS port complies with the electrical specification EIA-644.

Status LEDs indicate speed and traffic flow on the Ethernet port, whilst unit configuration is performed via BIT switches on the base on the unit.

Further information can be found via the LV2000 product page.

 

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