Specifications

Virtual Private Networks (VPN)
AVM Access Server – 1 Welcome to the AVM Access Server 9
Throughput can also be increased by bundling the ISDN B channels–
even channels connected to several different ISDN-Controllers. The
AVM Access Server in the basic product variant is expandable up to ten
channels, thanks to support for up to four AVM ISDN-Controllers B1 or
one ISDN-Controller C4 on ISDN BRI (Basic Rate Interface) lines. The PRI
(Primary Rate Interface) variant supports the use of up to 120
B channels.
The AVM Access Server controls the ISDN connections through active
AVM ISDN-Controllers, which can be connected either directly to the
public ISDN network (in point-to-multipoint or point-to-point configura-
tion), or to PBX extension lines.
The AVM ISDN-Controllers B1, C2, C4, T1 and T1-B also support GSM
connections in accordance with the Mobile ISDN standard
(GSM 07.08). This permits reliable, transparent ISDN connections from
cellular networks over GSM or HSCSD (High-Speed Circuit-Switched
Data).
Virtual Private Networks (VPN)
The AVM Access Server allows you to connect both remote users and
remote networks to the LAN over a VPN (Virtual Private Network). The
AVM Access Server sets up VPN links over existing Internet connec-
tions, taking advantage of the Internet Services Provider’s infrastruc-
ture. The AVM Access Server itself establishes the VPN connections
and routes the network communication among the remote systems,
however. In a VPN, each participating site incurs only the costs for the
connection to its Internet Service Provider. This makes VPN connec-
tions an extremely economical way to interconnect remote systems.
Optimum Throughput
The AVM Access Server offers the following functions to ensure opti-
mum utilization of the ISDN bandwidth and to increase throughput:
Data compression per CAPI standard Stac LZS, MPPC and IPComp
TCP/IP header compression in accordance with the Van Jacobson
standard
CAPI standard channel bundling, as well as static and dynamic
Multilink-PPP