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Chapter 1 – Product Description & Specifiication
Chapter 1 – Product Description &
Specifications
Product Description
The MultiAccess ACS analog communication servers provide connectivity to the corporate LAN for
telecommuters and mobile users, or to remotely installed equipment, via integrated V.92/56K modems.
The MultiAccess ACS units described in this User Guide are the MA220 which is a 2-port unit; the MA420
which is a 4-port unit and the MA820which is an 8-port unit. All three units provide the same Remote
Access Server, RAS, and modem sharing capabilities except for the number of ports each unit can
provide. The MA420 and MA820 are provided in a desktop and rack mountable units where as the MA220
is provided in a desktop and wall mountable unit.
MultiAccess MA820
The MultiAccess ACS has two roles (usages), RAS and Modem Sharing.
RAS Solution: The MultiAccess can be used as a dial-in PPP Remote Access Server in a LAN to Client
environment. The purpose is to give remote nodes (i.e., Microsoft Dail-up Networking clients) TCP/IP
access to the same subnet and LAN the MultiAccess is installed on. Masquerading (NAT) and LAN to
LAN routing (assignment of an entire subnet) are IP networking techniques not supported by the
MultiAccess. The supported PPP security protocol (means of communicating user credentials between
PPP end points) is PAP only.
Modem Sharing Solution: The modems in the MultiAccess can be a shared resource on your network,
commonly referred to as a network modem pool. Computers with network access to the MultiAccess can
use Telnet and get direct AT command access to one of the modems in the MultiAccess, for either
outbound or inbound calls. A common way to take advantage of this role is by installing Com Port
Redirector Software (i.e., Multi-Tech's MCSI2000 for Windows) on your workstations. The redirector adds
a virtual com port to the workstation and uses Telnet to map, redirect, the com port to a modem in the
MultiAccess. The redirector and Telnet session replaces the UART based hardware of a PC and serial
cable connection normally found in traditional modem installations. A communication program using this
virtual com port has its data redirected to and from the modem within the MultiAccess, making the modem
appear as if it is directly attached to a communication port on the workstation.
MCSI2000 Utility is provided on the MultiAccess CD and a summary of the parameters are presented in
Appendix E.
Modem AT Commands are presented in Appendix F.
For the latest revision of the MultiAccess User Documentation, refer to the Multi-Tech Systems, Inc. Web
site:
http://www.multitech.com
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Multi-Tech Systems, Inc. MultiAccess User Guide
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