MMJ jacks, positioned close to the terminals to be connected. Model Number: DSRVB-** Ports: 8 DB25 (/MC) or 8 MMJ (/DL) Alternate product: DECserver 708, 8 ports DB9, DSRVW-R* DECserver 250 The DECserver 250 was a network server for printers for Ethernet Local Area Networks, consisting of a single box that provided the following: (2) Digital Parallel printer ports, each of which used a male 37-pin connector, (4) EIA RS-232-C/CCITT V.24 asynchronous line interfaces for connecting three serial printers and one serial printer or terminal, and (1) Ethernet interface transceiver port. The DECserver 250 implemented the Local Area Transport (LAT) protocol for communication with service nodes that implemented this protocol on the same Ethernet. Software that ran on the DECserver 250 was down-line loaded over the network from a Phase IV DECnet load host. Model Number: DSRVP-** Ports: 7 (see above) Alternate product: None. DECserver 300 The DECserver 300 Terminal Server was an Ethernet Communications Server for Ethernet Local Area Networks, providing a convenient method to logically connect up to sixteen digital asynchronous terminals to one or more service nodes (hosts) on an Ethernet. The DECserver 300 used MMJs (Modified Modular Jacks) for the attachment of asynchronous devices. The MMJ segregated a Data from a Voice connection. The DECserver 300 utilized the EIA 423-A electrical interface standard for local connections. EIA 423-A is compatible with the EIA 232-D interface and supports DTR/DSR (Data Terminal Ready/Data Set Ready) signals. EIA 423-A supports longer cable runs and higher signaling speeds. The DECserver 300 implemented the LAT protocol for communication with service nodes that implemented this protocol on the same Ethernet. The DECserver 300 also implemented the TCP/IP protocol suite for communication with host systems that implemented TCP/IP. Model Number: DSRVF-** Ports: 16 DB25 or MMJ Alternate product: DECserver 708, 8 ports DB9 or DECserver 716, 16 ports RJ45 DECserver 500/550 The DECserver 500 series server was an Ethernet Communications Server for Ethernet Local Area Networks (LANs), configurable to provide 128 EIA-423-A or 64 RS-232 asynchronous port connections to DEC asynchronous terminals. Both RS-232, via the 8 port CXY08 Q-Bus communication option card, and EIA-423-A, via the 16 port CXA16 communication option card and EIA-422 16 port CXB16 communication option card could be mixed together in any combination from two to eight cards in one server. The DECserver 510 and 550 would also support CXM04 IBM 3270 Terminal option cards, but on VMS