Specifications

130 AVM Access Server – Glossary

LAN (Local-Area Network)

A computer network limited to a given location, such as a company site

or a government agency’s office building. Remote computers can use

appropriate software (such as the AVM Access Server) to join a LAN

over ISDN, ADSL, GSM or VPN connections.

Logical ISDN connection

A logical ISDN connection refers to the situation in which two comput-

ers consider an ISDN connection between them, which can be dialed

up in one or two seconds, to be virtually continuous. An actual B-chan-

nel connection need not be continuously active during the logical ISDN

connection. Throughout the entire duration of the logical ISDN connec-

tion the AVM Access Server maintains all the connection parameters

that were negotiated when the physical connection was first dialed up.

These parameters include the network protocols used, the authentica-

tion requirements, spoofing mechanisms and channel bundling. If data

is queued for transmission when no B-channel connection is active,

the B channel can be dialed up immediately.

Logical ISDN connections to the Internet are not supported by Internet

Service Providers.

Logical network connection

A logical network connection refers to a network-layer connection be-

tween two LANs, or between a LAN and a remote client. As long as the

logical network connection exists, each site maintains a route to the

other in its routing table.

Metric

The metric is an abstract value assigned to a route to give different rel-

ative priorities to different routes. If several routes are available to a

given destination, the AVM Access Server chooses the route with the

lowest metric as the “best” route.

MSN (Multiple Subscriber Number)

In Euro-ISDN (the D-channel protocol DSS1), point-to-multipoint ISDN

lines are assigned multiple subscriber numbers, which can be used to

distinguish between several end systems on the same S

bus, or be-

tween several CAPI applications on the same computer. In Germany,

Deutsche Telekom AG assigns standard ISDN lines three MSNs.