6/12

4

Protocols

The TCP/IP Internet Protocol Suite, normally referred to as TCP/IP after the main standards, was developed for the DAR-

PA/NSF Internet. The TCP/IP protocols have proved so popular that they are used for many networks not connected

to the Internet.

The protocols, standards and policies of TCP/IP are published by the Network Information Center (NIC) and are known

as Requests For Comments (RFCs). The TCP/IP protocols used by the TCPlink box are designed to conform to RFC

1122 ‘‘Host Requirements – Communications’’.

The IMS B300 incorporates firmware, implementing the following protocol elements:

Linkops Connection Server

Provides access to named subsystems over TCP/IP to remote users.

TCP and UDP transport services

The TCP implementation provides a reliable connection oriented transport layer, designed to meet Internet stan-

dards RFC793 and RFC 1122. UDP provides a datagram service, implemented to RFC768 and RFC 1122.

IP Network Layer

This layer is designed to meet Internet standards RFC791 and RFC1122 for IP layer behaviour.

Address Resolution Protocol

The dynamic Ethernet address resolution protocol, designed to meet Internet standards RFC826 and RFC1122.

Ethernet Data Link Layer

The Ethernet interface in the device encapsulates IP layer datagrams within Ethernet packets. The packetisa-

tion used is as specified in Internet standard RFC894 (i.e. Ethernet V2 Packetisation). The Data Link Layer re-

quirements of RFC1122 are also met by this layer.

5

Performance

A raw TCP data-rate of several hundred kilobytes/second is supported. Some reduction in total data bandwidth may occur

due to the host server or when multiple IMS B300 links are operating concurrently.

6

Specification

Feature

Value

Unit

Power dissipation

25

W

Operating temperature

10-40

°C

Weight

7

kg

Length

421

mm

Height

95

mm

Depth

251

mm

Links and system services signals are buffered to levels compatible with EIA RS-422. Inputs will also receive TTL compat-

ible signals and one side of the outputs can be used to drive TTL compatible loads. The serial interface provides a func-

tional subset of an EIA RS232 DCE. The IMS B300 is powered from AC mains and is compatible with worldwide mains

supplies. The unit is shock and vibration resistant to a level consistent with office and air-freight standards.

6.1

Mains connection

The IMS B300 may be connected to either a 110V or 240V mains supply and will automatically switch to the supplied

level. A clean mains supply is required in one of the two voltage ranges shown in Table 1. The IMS B300 must be earthed

via the mains cable supplied. A mains fuse should be fitted to the power inlet module, rated as shown in Table 1. The