Products in brief

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S4400

Connects up to eight remote Ethernet I.ANs into single integrated network using point-to-point lines or X.25 data networks. Enclosure itself holds up to four independent hardware modules, each containing two serial port connections. User can add or replace a module or troubleshoot a single network segment while rest of network operates freely. Serving as network hub, the ACS 4400 simultaneously bridges and routes data through network as required by individual LANs

Advanced Computer Communications, 720 Santa Barbara St, Santa Barbara, CA 93101, USA Tel: (805) 9639431

NB 2010

Operates at the Media Access Control (MAC) layer of the ISO network model, supporting any combination of TCP/IP, XNS, DECnet, LAT, TOP and ISO traffic. Filtering rate of 24 000 pps and forwarding rate of 13 000 pps. Three types of filtering can be applied to packets: multiaddress filtering reduces number of broadcast messages sent to other networks; source address can keep certain network nodes from transmitting to the rest of the network; and protocol type filtering can be used in a mixed I.AN environment to keep certain protocols local. Multiple NB2010 bridges can be installed to provide a backup routing capability

ICN Ltd, The Old Bell House, 4 High Street, Twyford, Berks RG10 9AE, UK. Tel: (0734) 320808

LANStar FDDI Bridge

Allows multiple LANStar transport hubs to be interconnected via 100 Mbit/s fibre optic ring to provide communications and resource sharing between widely scattered local networks. Complies with ANSl X3Tg.5 protocol, allowing compliant products from other vendors to coexist on ring. Compatible with other LANStar products including TCP/IP gateway and NetWare interface card

Northern Telecom, 200 Athens Way, Nashville TN 37228, USA. Tel: (615) 7344251

Bridges

Communications analysers AlphaNet 2.1

Supports 10 MHz link, designed to connect VME-based systems and attach PCs and PC LANs via AlphaLAN. Based on industry standard IEEE 802.3 communications protocol standard. Incorporates series of programs that provide analysis of network speed. Fully compatible with AMOS/L versions 1.3D and later, and AMOS/L and AMOS/32 2.0A

Alpha Microsystems Ltd, Enterprise House, 1 B Roxborough Way, Foundation Park, Cannon Lane, Maidenhead, Berks SL6 3UD, UK. Tel: (0628) 822120

Interview 5700

Protocol analyser with integral 80 Mbyte hard disc for recording high speed data -- rates up to 2.048 Mbit/s supported. Single 800 kbyte microfloppy discette included for disc-to-disc file transfers and installing new software. Interface connection units supported include TI, ISDN, X.25, which can be attached via a bus connector. Using the 5700's remote control capability, an operator can access a remote 5700 worldwide via dial-up link. Detachable ASCII keyboard, integral R5-232C and V.35 line interface ports, dual-mode breakout box and an extensive application program library included

AR Division, Telenex Corp, 7401 Boston Boulevard, Springfield, Virginia 22153, USA. Tel: (703) 644 9190

SpiderAnalyser 320-R

Compatible with IBM and IEEE802.5 token ring LANs operating at 4 Mbit. Multitasking architecture allows it to monitor network continuously. Filters and captures packets using pre-defined patterns and message types, and automatically decodes MAC control frames, LLC, TCP/IP/UDP, ISO, CONS/CLNS, NetBios and IPX protocols. Higher level decodes for IBM SMB, Novell Netware, TCP/IP and ISO (up to transport layer) also available

Spider Systems, Spider Park, Stanwell Street, Edinburgh EH6 5NG, UK. Tel: (031) 5549424

Multi-channel serial card with eight possible channels, each of which can be set to RS232, RS422, RS485 or 20 mA loop at any individual address location and any interrupt channel. RS232/422/485/20 mA operation is selected by small submodule which plug into board. Other channel-bychannel options include the base address (I 28 possible addresses per channel) and interrupt channel (IRQ2-7) which are set via DIP switches. Software driver supplied with card features flexible addressing via MSDOS from COMI to COM99

Blue Chip Technology, Hawarden Industrial Park, Manor Lane, Deeside, Clwyd CH5 3PP, UK. Tel: (0244) 520222

Interfaces MSC-8

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computer communications

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Description

Manufacturer~distributor

BABT-approved modem allows Oyster's RT80 data capture device to send and receive data over public telephone network, Supports V.21 and V.22 protocols (300/300 and 1200/I 200 bits/s line speeds) and incorporates auto-dial/auto-answer. Ring-suppression circuitry restricts telephone bell ringing on incoming modem calls. Mounted in the RT80's add-on extension unit which fits into top of RT80

Fairoak House, Church Road, Newport, Gwent NP9 7EJ, UK. Tel: (0633) 214147

K-Link 96

Provides non-stop dial back-up for digital services normally operating at up to 64 kbit/s such as BT's Kilostream. Incorporates V32, 9600 baud auto-dial/auto answer facility. If digital link higher than 9600 baud, K-Link can reconfigure the digital device to cater for lower composite speed. Can be used as adaptor for connection between customer terminal equipment and network terminating units. Selectable V24/V28 or X.21 ports to match NTU interface and method of operation. Four user definable configurations available for use in conjunction with PSTN autodialling

ITS, Unit 4, Priors Way, Braywick, Maidenhead, Berks SL6 2HP, UK. Tel: (0628) 770929

V23 modem

Low power BABT-approved modem for use on PSTN lines, private wire or radio communications. Suitable for point-to-point and multi-point application and can be configured for 1200 or 600 bit/s, full or half duplex. In-built anti-streaming timer capable of disabling transmitter after time delay to prevent faults blocking comms network. Relay output provided for switching on radio transmitter. Requires single power supply of 10.5 to 36 V dc. Colour-coded LEDs indicate status of received and transmitted data, all handshake lines and transmitter enabled. Both transmission and reception strengths available as 0-5 V dc output

Seprol Ltd, Holbrook Green, Halfway, Sheffield $19 5GZ, UK. Tel: (0742) 483154

Name Modems Oyster modem

Multiplexers and concentrators K-Net This 64 kbit/s time division multiplexer accomodates one or two 19 inch rack assemblies with up to eight composite links. Maximum configuration provides four dual aggregate cards with 32 logical channels and 55 physical channels per multiplexer. System itself comprises a processor/ control card, link card providing two independent composite links and the PSU. Range of interfaces suitable for direct connections to Mercury or BT kilostream circuits, baseband modems, V-series modems, onward linking to full or half duplex modems, low-speed kilostream circuits plus direct connection to PABX tie line ports and BT speechboard private circuits Network management AMT 212 Network workstation with discless 286-compatible computer running at InfoStation 12 MHz or 8 MHz with selectable software. Memory capacity from 1 to 4 Mbyte with two serial, one parallel and one external port. 14 inch monochrome paper white Hercules display monitor. Supports range of networking environments including Novell, token ring, ARCnet and 3Com. Can be used as intelligent terminal hooked into mainframe, handling IBM 3270, 5250 or DEC VT220 communications via emulation card and software

Zeta Communications, Zenith House, Gresford Industrial Estate, Gresford, Wrexham, Clwyd LL12 8LX, UK. Tel: (0978) 853900

Applied Microsystems Technology Ltd, 249-251 Cricklewood Broadway, London NW2 6NX, UK. Tel: (01) 4503222

From left to right: Interview 5700 series of protocol analysers from AR Division, Blue Chip's MSC-8 Multi Channel Serial Card and the AMT ZIZ InfoStation

vol 13 no 4 may 1990

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