A conglomeration of several modems is called a modem bank. The specialized
hardware you need to set up a modem bank is called a modem chassis. This
is essentially a box with many slots into which you can plug modem cards.
To give you an idea of what a modem chassis looks like and how much
you can expect to pay for one, here is a current listing from eBay for
a seven-slot chassis made by Microcom, which was one of the foremost
manufacturers in the heyday of modem banks.
eBay: Compaq 6100 M1 7-Slot Microcom 178680-001 Fully Loaded
If you search for the word "chassis" on the following page, you will
find listings for several 16-slot modem chassis from Microcom. Because
modem banks are an obsolescent technology with little demand nowadays,
you will most likely have to buy a used modem chassis.
DCE Express: Microcom Legacy Products
Another name for a modem chassis is "modem rack". The following product
listing includes several Microcom 16-slot racks, along with Microcom
modem cards. National Data Mux, the company selling these and other
used networking products, will send you a catalog if you fill out their
National Data Mux: Microcom Products
National Data Mux: Brochure Request Page
Another dealer in modem racks and modem cards is Modem Express, which
sells all the major brands, including Microcom.
Modem Express: About
Modem Express: Contact
A good alternative to setting up a standalone modem rack is the
Rapidport/4 modem from Digi. The Rapidport/4 is a single unit that
contains four integrated modems. It plugs into your PC's USB port,
and it also has a port that lets you hook up additional Rapidport/4
units. You can link up to five of these units for a total of 20 modems
on a single PC.
The Rapidport/4 four-port USB modem module is a flexible USB based
remote access solution for Windows platforms. This external,
user-installable solution plugs into an existing USB port of a
PC, thin client or server, providing four 56K V.92 modems.
With its built-in USB hub, you can daisy-chain up to five
Rapidport/4 units for up to 20 modems from a single USB port
on your PC or server. Rapidport/4 gives network users access
to ISP, fax and other dial-up applications supported by Windows
Digi: Rapidport/4 USB Modems
Finally, you can buy multiport modem cards with room to plug in up to
eight modems, which you must buy separately.
Comtrol: RocketModem Multimodem Products
Digi: AccelePort RAS Family
MultiTech Systems: MultiModem ISI
PC Micro: Digital Multi-Modem Cards for Server Based Remote Access
Perle: PCI-RAS 4 and 8 Multi-Modem Cards
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