1. 11/7: Telecom & Networking, cont. Network services –ISDN, DSL, Cable modems, etc. –Which to use? ATM E-Commerce & E-Business technologies EDI: Electronic Data Interchange Email: available services, etiquette

2. 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

3. 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

4. Frame Relay Another data-only network (well, a few newer ones have voice) 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

5. Asynchronous Transfer Mode (ATM) Synonym: 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).

6. 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 http://www.swbell.com/Products_Services/Business/Pro dInfo_1/1,1973,26--4-1-,00.html http://www.swbell.com/Products_Services/Business/Pro dInfo_1/1,1973,26--4-1-,00.html

7. DSL: Digital Subscriber Line Also uses public telephone lines Transmission speeds: Downstream: 384 Kbps – 1.5 Mbps Upstream:128 Kbps Costs about $ 49.95 / month (SWBell) Installation: $ 0.00 (if you “self-install”) + equipment $99.00

8. Cable Modem Uses cable television lines Transmission speeds: (depends on choice of service) Downstream: 256 Kbps – 1 Mbps Upstream: 64 Kbps – 256 Kbps 74.95 – 39.95 – 25.99 / mth + $10.00 for basic cable (Charter Comm.) Installation:$29.95 + equipment $5.00 /mth More info (no pricing) at http://www.chartercom.com/products/internet/int ernet.asp http://www.chartercom.com/products/internet/int ernet.asp

9. T1, T3 lines Dedicated telephone line for data service Transmission speeds: T1: 24 channels at 64 Kbps/ea = 1.544 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 http://www.everythingt1.com/http://www.everythingt1.com/

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

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

12. Email: General Considerations email address: yourname@somewhere.com electronic mail vs. “snail mail” programs for email: Netscape Messenger, MS Outlook, Eudora messages reside on the server until downloaded by the user

13. Your SLU email forwarding your SLU email to another account –use Telnet.exe –directions available at http://www.slu.edu/services/ITS/forward.html http://www.slu.edu/services/ITS/forward.html –MAIL> SET FORWARD you@somewhere.com using http://mail.slu.eduhttp://mail.slu.edu

14. To:, CC:, BCC: Reply-To: CC to self Attaching files

15. Email Etiquette awareness of conventions is important essence of email: immediacy remember: email is never dead… –messages are easily forwarded –messages are used as proof “That’s not what I meant” –think and pause before you send it –context and nuance are lost in email –easily perceived as rude, offensive, or harsh :-)

16. Email Etiquette: Dos & Don’ts DO use email for general announcements DO use email to congratulate people and “quick hellos” DON’T use email to complain, gripe, or argue: talk in person DON’T use email for confidential information :-) ;-)

17. Email Etiquette: Dos & Don’ts DO say hello DO sign your name DON’T use all capital letters: All capitals = SHOUTING in email DO use emoticons or make it plain that you are jokingemoticons DON’T leave all the headers on a message you plan to forward :-) ;-) :->