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How to DIALUP to Athena with an ISDN phone NOTE: This document refers to a deprecated service and exists purely for reference purposes. * Connecting to Athena directly via an ISDN phone is deprecated. * There is one remaining Cisco Protocol Translator in service as of * 2006, and it may be removed from service at any time without * notice. Anyone still relying on the CPTs as their primary method * of connecting to Athena should transition to MITNet Ethernet * service. Remote access clients may be found at * http://web.mit.edu/software/, or you may use the Java-based client * at http://athena.dialup.mit.edu. For information on getting an * MITnet drop installed in your lab or office, contact the MIT * Helpdesk at computing-help@mit.edu or x3-1101 Athena supports dial-in connections via digital phones. In order to take advantage of this capability, your computer should be connected to the port on the back of your black ISDN 7506, or 7507, digital phone set with a "hardware-handshaking" serial cable. This allows your computer and digital phone to use special signals to control data flow when communicating at high speeds. 1. Once your digital phone is hooked up to your computer, start your communications software, and make sure that you have set the following parameters: 8 data bits 1 stop bit No parity Full duplex 19.2Kbps speed At this point, you will be talking to your digital phone. You should see a prompt like this: CMD: The very first time you want to make a digital data call, you should type the following commands at the "CMD:" prompt: set mode dx25 set parity space set rec.flow eia set trans.flow eia These commands place the phone into packet-switched mode, set the parity to "space," and enable hardware flow control between the computer and digital phone. If you are not using a "hardware-handshaking" serial cable, you will not be able to (and should not) turn on hardware flow control. If you do not use hardware flow control, you run the risk of losing characters at high speeds. After configuring these settings on the digital phone, you can dial up to Athena by typing the following at the "CMD:" prompt: d 700-7000 This will connect you to one of the cisco protocol translators (CPTs). Continue with the instructions in step 2, below. 2. At this point, you should be greeted by the CPT box. If you see nothing, hit return once, and you will get a prompt like this: ZITI.MIT.EDU> or LASAGNE.MIT.EDU> or TORTELLINI.MIT.EDU> or CANNELLONI.MIT.EDU> or RAVIOLI.MIT.EDU> or LINGUINE.MIT.EDU> (They're named after pastas.) To see a list of possible commands, type "?". In most cases, though, you will simply want to connect to a dialup machine. Typing: athena at the aforementioned prompt will open a telnet connection to an Athena dialup machine. Currently, there are eleven dialup machines supported by Athena. They also do load balancing (a calculation based on a combination of CPU load, number of users, and available disk space), so you will automatically be connected to the least loaded dialup server. At this point, log in to Athena as usual. When you log out, you will be returned to the CPT prompt. To disconnect, type "exit," "quit," or just "q" -- or simply hang up the phone. The system will disconnect cleanly if you just hang-up. Much of this information was taken from the Athena document "Dialing Into Athena," available free from the CopyTech centers in the basements of building 11 and the Student Center, or in Online Help. To see this information online, just type the following at your athena% prompt: help dialup You may also wish to consult the IS publication "IS-9: Dial-up Access to MIT Computers and Others," available free from the MIT Computer Connection in the Student Center basement or by sending email to sendpubs@mit.edu or by calling 253-5150. last updated: 6/12/95 |
