3/25: Telecom & Networking, pt. 2 Network services –ISDN, DSL, Cable modems, etc. –Which to use? ATM E-Commerce & E-Business technologies EDI: Electronic.

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3/25: Telecom & Networking, pt. 2 Network services –ISDN, DSL, Cable modems, etc. –Which to use? ATM E-Commerce & E-Business technologies EDI: Electronic Data Interchange

Network Services Packet switching (X.25) Frame relay Asynchronous Transfer Mode (ATM) Integrated Services Digital Network (ISDN) Digital Subscriber Line (DSL) Cable modem T1, T3 lines

Packet Switching (X.25) Older form of running LANs Data-only network Works well in small groups Becomes inefficient and slow as network expands Breaks transmitted data into packets of 128 bytes each Sends them, checking for transmission errors

Frame Relay Another network Variable length link-layer frames. Less overhead than X.25 Higher speed than X.25 Higher capacity than X.25 Common setup today for LANs and WANs

Asynchronous Transfer Mode (ATM) AKA Cell Relay. Not data-only: can transmit voice, video, data, images, etc. Seen as the eventual replacement for X.25 & Frame Relay, as well as ISDN. Transmits “cells” of 53 octets (8 bytes).

ISDN: Integrated Services Digital Network International standard for transmitting voice, video, data over public telephone lines. Older system, being rapidly replaced with DSL. Transmits at 128 Kbps Costs about $ / month. Installation costs: See more information at dInfo_1/1,1973, ,00.html dInfo_1/1,1973, ,00.html

DSL: Digital Subscriber Line Also uses public telephone lines Transmission speeds: Downstream: 384 Kbps – 1.5 Mbps Upstream:128 Kbps Costs about $ / month (SWBell) Installation: $ 0.00 (if you “self-install”) + equipment $99.00

Cable Modem Uses cable television lines Transmission speeds: (depends on choice of service) Downstream: 256 Kbps – 1 Mbps Upstream: 64 Kbps – 256 Kbps – – / mth + $10.00 for basic cable (Charter Comm.) Installation:$ equipment $5.00 /mth More info (no pricing) at ernet.asp ernet.asp

T1, T3 lines Dedicated telephone line for data service Transmission speeds: T1: 24 channels at 64 Kbps/ea = Mbps total (can also buy a portion of a T1 line) T3: 672 channels, 64 Kbps/ea = 43 Mbps total Costs at least $ 499/mth for T1, lots more for T3 Installation:$ ??? More info at

E-Commerce & E-Business Tools Electronic mail ( ) Voice mail Facsimile machines (fax) Teleconferencing Dataconferencing Videoconferencing Groupware Electronic Data Interchange (EDI)

Electronic Data Interchange Computer – to – computer exchange between two organizations of standard business transaction documents COMPUTER SELLERCUSTOMER ORDERS, PAYMENTS SHIPPING NOTICES, PRICE UPDATES, INVOICES