Google (as always) is your friend
I think the product you have in mind is something like
this?An alternative that's probably cheaper, is to buy a Cisco router and use it as a terminal server through reverse telnet. A Cisco 2509 (8 Lines), 2511 (16 lines) or a 2600/3600 series with a
NM-16A or NM-32A async module with a
CAB-OCTAL-ASYNC cable will do you just fine.
Then it's just a matter of setting up a
reverse telnet through ip host using a local IP:
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ip host <remote hostname> 2001 <local IP address>
Where 2001 is the async line + 2000 and local IP address is any local address.
To manage your sessions:
Hold Ctrl-Shift-6 and press "X" to jump out of your telnet session (keeps it active).
Show sessions will show you what telnet sessions are active:
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2511TS#show sessions
Conn Host Address Byte Idle Conn Name
1 Router1 10.1.1.10 0 0 Router1
2 Router2 10.1.1.10 0 0 Router2
* 3 Router3 10.1.1.10 0 0 Router3
Typing "Y" and hitting enter at user/priv mode will reconnect to session "Y"
Or hitting enter with no text will return to the last active session
You could probably find a similar setup using a normal computer and a serial async card.
I have to ask the question though - what's wrong with regular telnet/ssh that you need console access at all times?