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- From: Jim_Johnson@abcd.Houghton.MI.US (Jim Johnson)
- Newsgroups: comp.sys.ibm.pc.hardware
- Subject: Re: Multiple modems ...
- Distribution: world
- Message-ID: <Jim_Johnson.0arr@abcd.Houghton.MI.US>
- Date: 8 Nov 92 20:14:26 EST
- Organization: Amiga BitSwap Central Dispatch
- Lines: 60
-
- In a message dated Sat 7 Nov 92 21:05, Jorgense@plains.nodak.edu (lee A. J
- wrote:
-
- JAJ> Ok ... I have a Wyse 50 terminal hooked up to my phone line, and a
- JAJ> 286 with
- JAJ> an internal modem hooked up to the same line. Both modems are 2400
- JAJ> baud.
- JAJ> I have them chained right now (my wyse is hooked to the wall and my
- JAJ> pc is hooked
- JAJ> to the other jack on the wyse's modem and a normal phone hooked up
- JAJ> to the
- JAJ> 2nd jack of the pc's modem).
-
- JAJ> like:
-
- JAJ> W
- JAJ> a <----------WYSE <----------PC <----------Phone
- JAJ> l MODEM MODEM
- JAJ> l
-
- JAJ> (poor ascii art:)
-
- JAJ> Anyway, is there anyway I can use the Wyse to 'look' at the data if
- JAJ> I
- JAJ> connect with the PC to the mainframe, or can I use the PC's modem to
- JAJ> 'look'
- JAJ> at the data If I use my Wyse?
-
- JAJ> (in other words ... can I use two modems on the same line, on
- JAJ> different
- JAJ> machines, at the same time?)
-
- Most communications are full duplex. One modem is the "originating" modem
- (usually yours), and the other modem is the "answering" modem (the
- mainframe). The originating modem modulates one frequency to send, and
- demodulates another frequency to receive. The answering modem uses the
- same frequencies, but reverses which one is used to send and which one is
- used to receive.
-
- After making a connection to the mainframe with your "primary" modem, you
- could try typing "ATO" with your "secondary" modem (assuming your modems
- are Hayes command compatible). So long as the communications are full
- duplex and the mainframe echos back everything you type, you should see
- both sides of the communication after being sent by the mainframe.
-
- Be careful to transmit *nothing* with the "secondary" modem. The mainframe
- will think it came from your "primary" modem, and your "primary" modem will
- think it came from the mainframe. Make sure your modem and comm program is
- set to not respond to an ENQuiry request.
-
- If the link is only half duplex, you will only be able to see one side of
- the communication. "ATO" will get you the mainframe side, and "ATA" will
- get you the "primary" modem's side.
-
- -- Via DLG Pro v0.995
-
- jim_johnson@abcd.houghton.mi.us
- from Calumet, Michigan, USA -the world's former copper mining capital,
- located on Lake Superior and home to America's newest National Park,
- ** The Keweenaw National Historic Park **
-