Software Product Description

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Software Product Description Software Product Description PRODUCT NAME: DECserver 90 TL Software, Version 1.1a SPD 38.71.03 DESCRIPTION group of ports can each be defined as the same service. With reverse LAT, if the node from which the service re- DECserver 90TL Software, Version 1.1a is an enhanced quest is initiated is properly configured, the service re- software release for the DECserver 90TL. quest will be sent to the port with the highest capacity rating. The DECserver 90TL software provides concurrent Lo- cal Area Transport (LAT) and Telnet TCP/IP protocol The DECserver 90TL also allows for host-initiated con- support from a DECserver 90TL communications server nections to serial printers. A print symbiont on service to enable connectivity to host systems that utilize LAT or nodes can initiate connections to serial printers con- TCP/IP protocols. The TCP/IP protocol suite is used to nected to DECserver 90TL ports. This allows the print- connect to UNIX® host systems and other host systems ers to be distributed throughout a facility and accessed that support the TCP/IP protocol suite. transparently by service node users. Incoming host- The DECserver 90TL Communications Server is an initiated connect requests can be queued FIFO at the Ethernet Communications Server for Ethernet Local server. Area Networks (LANs). The DECserver 90TL provides a convenient method to logically connect up to eight digital Port-to-port connections on the same server are also asynchronous terminals to one or more service nodes supported. (hosts) on an Ethernet. Once the terminal is connected, The DECserver 90TL implements the LAT protocol for a user can utilize application programs and utilities as communication with service nodes that implement this though the terminal was directly connected to a host protocol on the same Ethernet. This interface has been via a DMF32, DHU11, or DHV11/DHQ11 device, with optimized for high terminal I/O performance over an a few exceptions. Thus, it may be possible to utilize Ethernet, while reducing host CPU cycles required to the DECserver 90TL to connect all terminals to service handle interrupts. Hence, under most I/O loading condi- nodes in place of traditional interfaces, except for host tions, a significant performance gain can be realized by console terminals. using the DECserver 90TL versus direct terminal con- In addition, the DECserver 90TL provides IP end-node nections via traditional asynchronous backplane com- routing via SLIP (Serial Line Internet Protocol). Up to munications interfaces. eight TCP/IP systems can be connected to the serial ports of the DECserver 90TL. These systems can run The DECserver 90TL also implements the TCP/IP proto- IP applications (such as Telnet, FTP®, X-Windows, etc.) col suite for communication with host systems that im- on the serial line and communicate with other TCP/IP plement TCP/IP. The TCP/IP implementation is based services on the network. on the University of California’s 4.3 Berkeley Software Distribution (BSD). The following TCP/IP protocols are The DECserver 90TL uses MJ8 (similar to RJ45 jacks supported and adhere to the Defense Data Network used in telephone jacks) for the attachment of asyn- (DDN) Request for Comments: chronous devices. The DECserver 90TL utilizes the DEC 423-A electrical interface standard for local con- • Transmission Control Protocol (TCP) is the Internet nections. DEC 423-A is compatible with the DEC 232-D standard transport level protocol that provides the interface and supports DTR/DSR (Data Terminal Ready reliable, end-to-end full duplex, stream service that /Data Set Ready) signals. DEC 423-A supports longer supports many application protocols (RFC793). cable runs and higher signaling speeds. • Bootstrap Protocol (BOOTP) is the Internet standard The DECserver 90TL supports reverse LAT and Telnet protocol for downloading software that is on the DEC- Listener. These can be used to share the load on asyn- server 90TL (RFC951); also, BOOTP Vendor In- chronous devices connected to the DECserver 90TL. A formation Extensions (RFC1084), the TFTP proto- dt April 1994 AE-PME5D-TE DECserver 90 TL Software, Version 1.1a SPD 38.71.03 col (RFC783), and Bootstrap Loading using TFTP — Telnet character and binary profiles are supported (RFC906). for Internet sessions. Telnet options supported include: status (RFC 859), end of record (RFC • User Datagram Protocol (UDP) is an Internet pro- 885), remote flow control (RFC 1080), echo (RFC tocol that provides datagram service to application 857), timing mark (RFC 860), binary (RFC 856), programs, allowing an application program on one and suppress go ahead (RFC 858). machine to send a datagram to an application pro- gram on another machine. UDP is necessary for — Telnet Remote Console allows a user to estab- the Domain® Name System and the Simple Network lish a remote Telnet connection to the manage- Management Protocol (SNMP) (RFC 768). ment port on the terminal server and manage the server as if locally attached. The Telnet listener 23 • Internet Protocol (IP) is an Internet standard protocol can now be assigned to any server port as well that defines the Internet datagram as the unit of in- as the remote console. Any Telnet listener (23, formation that gets passed across the Internet, and 2001-20016) can be assigned to be the remote provides the universal addressing scheme for hosts console. and gateways for Internet connection-less, best ef- fort packet delivery services. IP includes ICMP as • Internet Domain Name System (DNS) Support. The an integral part (RFC 791). Domain Name System provides the translation from system name to Internet address. The DECserver • Internet Control Message Protocol (ICMP) is an In- 90TL will interface to user programs and send ternet network protocol that specifies error and con- queries to domain name servers for translating do- trol messages used with the Internet protocols (RFC main names to Internet addresses, and Internet ad- 792). dresses to domain names (RFCs 1034, 1035). • Packet Internet Groper (PING) tests the reachability • Subnet Addressing (RFC 950). of nodes on the users’ Internet. ICMP echoes re- quests are sent and replies processed. • Simple Network Management Protocol (SNMP). The SNMP agent allows the DECserver 90TL to be man- • Address Resolution Protocol (ARP) is an Internet aged by an SNMP network management system. protocol used to perform dynamic address resolu- Retrieving information from the terminal server is tion to dynamically map or translate an Internet ad- possible using the SNMP GET and GET-NEXT re- dress into the correct physical hardware address quests. The SNMP SET operation is fully supported (RFC 826). providing the ability to modify DECserver parameters as well as create and delete applicable table entries. • Telnet is the standard Internet application level proto- The server can send unsolicited event alarms to col for remote terminal connection service. Telnet is specified SNMP management stations via the SNMP a virtual terminal facility that allows a user at one site TRAP message. Server variables accessible via to establish a TCP connection to a remote system. SNMP (RFC 1157) are defined by the Internet doc- Telnet makes the local terminal appear as a direct uments: MIB II (RFC 1213), RS232-like MIB (RFD extension of the remote system, allowing the user to 1317), the Character MIB (RFC 1316). conduct a session and run application programs as if the user’s terminal were directly connected to the • Serial Line Internet Protocol (SLIP). A host computer remote system (RFC 854). that supports SLIP can use the DECserver 90TL se- rial port as it’s network connection. This gives IP end nodes, which have no Ethernet controller, access to Both Telnet client and server capabilities are pro- the network and to other serial-line attached TCP/IP vided: end nodes. Any IP application (such as MAIL, X- Windows, NFS®, Rlogin, FTP, etc.) can then be run — Telnet client provides the ability to connect to any over the SLIP link (RFC 1055). remote TCP port at an Internet address on a Lo- cal Area Network (LAN) or a Wide Area Network The DECserver 90TL also implements and supports (WAN). Telnet client allows the user to specify a the Terminal Device/Session Management Protocol remote computer by Internet address as well as (TD/SMP) to manage multiple sessions at the device by domain name. level. The DECserver 90TL provides the ability to com- municate with terminals that also implement this proto- — Telnet server provides the ability to accept con- col (such as VT420, VT330+, or VT340+), and to assist nection requests from Internet hosts on a LAN or in the management of multiple sessions for these de- WAN to DECserver 90TL ports, such as printers, vices. By implementing this protocol, the DECserver host systems, or other serial devices. 90TL can permit attached devices to maintain screen 2 DECserver 90 TL Software, Version 1.1a SPD 38.71.03 and keyboard context for multiple LAT and/or Telnet ses- Load Balancing sions, as well as allow these devices to run multiple LAT and/or Telnet sessions concurrently. When a connection is made to a service, the actual node for the connection is determined by load balancing. The DECserver 90TL implements the ODL (On Demand Load balancing is a process the server uses when more Loading) font loading protocol that allows Asian termi- than one node offers the same service. Service nodes nals that implement the ODL protocol (such as VT382 do not have to be configured in a cluster in order for or VT282) to communicate with an OpenVMS host via load balancing to be used. Service nodes with the same a terminal server. The Asian terminals will be able to names may be running different operating systems. Us- request font definitions from an OpenVMS host when ing the load balancing process, the server connects to connected to a DECserver 90TL.
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