What is Modem Pooling?
Pooling is the centralization of modem resources to
a PC or server on a network. By creating a logical pool
(or group) of modems on the network, every user can
be given dialout access to a modem allowing them to
connect to remote modem locations for applications such
as banking, medical data transfer, faxing applications,
or even as an alternative Internet access for users.
While each user on the network uses a modem application,
they are automaticly provided with the next available
modem in the pool.
the advantages of Modem Pooling?
pooling modems, you can greatly reduce the number of
dedicated modems (and their associated phone line expenses),
that your organization requires. An example business
with 100 desktop modems that are used an average of
30 minutes per day, could reduce to as few as 8 modems
by pooling them.
NetModem modem pooling software can simplify administration,
by creating detailed logs or databases of modem usage,
and phone numbers dialed by each user.
NetModem can also increase network security, by restricting
DialOut modem access to specific authenticated users,
limiting the phone numbers allowed to be dialed, limiting
usage hours, and blocking Dial-In access entirly.
enterprise environments redundant modem servers can
be configured, providing a failover solution and improving
reliability in case one of the modem servers ever goes
COM Port Control?
Port Control is an extention to the TCP/IP telnet protocol,
which allows the client based modem applications to
control or monitor line settings on a modem server,
such as baud rate, flow control, DCD/DSR and DTR, just
as if the modem was connected locally. Not all modem
servers support COM port Control, but NetModem Server
uses it, and it is also used by the NetDialOut and NetSerial
redirector products if it is available on the server.
for DialOut, and RAS for Dial-In
pooling generally refers to DialOut (outbound) usage,
but the same pool of modems on a Windows Server can
also be assigned to RAS (Remote Access Service is part
of the Routing and Remote Access Service) to allow
remote users to dial-in to your network. RAS is part
of Windows Server. (More Information).
modems are support up to 56K (v.90/v.92) connections,
and use POTS (Plain Old Telephone System) phone lines.
Modems support both analog and digital connections.
Digital connections are 64k (using a single B channel)
or 128k (using two B channels). Digital Modems require
digital phone lines, such as:
lines (containing two B channels)
ISDN-PRI lines (containing 24 B channels)
ISDN-PRI lines (Containing 48 B Channels)
larger modem pools (over 16 lines) use digital modems
and phone lines, even if they only make analog calls.
This is because modem cards and modem servers that support
24, 30, 48, or 60 modems/channels generally require
T1 or E1 connections. T1 is primarily used in North
America, and E1 is primiarily used in Europe, South
America, and the South Pacific.
Modem Pooling vs a Server-in-a-box
can build a Windows PC based modem pool using NetModem
software with existing modems connected to a multi-port
serial card, or using multi-modem PCI cards. The NetModem
Server software can also be used as a front-end to
enhance an existing non-PC modem pool solution. An
advantage to using NetModem Server software is the additional
security and logging features. NetModem Server includes
unlimited client redirectors.
You can also use a Cisco dedicated Access Server box
for your modem pool, using NetDialOut
Client redirector software. NetDialOut is designed for
Legacy Cisco Access Servers which are no longer in production,
such as the AS5200, AS5300, AS5400 series supporting
Dual T1 or Dual E1 connections.
If you use a legacy access server which does not support
COM Port Control, you can use our NetSerial
Client redirector, which works with all brands of non-proprietary
modem servers and other remote serial devices.
Based Modem Pooling Conclusion
Modem pooling provides significant cost savings for
small to enterprise organizations, allowing them to
share modems and telephone lines more efficiently, and
PC Micro specializes in modem pooling solutions. You
are welcome to contact us to discuss your needs, or
you can request to download a fully functional evaluation
of our software.