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Section 2 — ISDN Connection Management
P2600 ISDN Connection Management
In the world of ISDN the ability to decrease connection time is a financial bonus in the LAN interconnecting marketplace. If
ISDN connections can be controlled so that a minimum amount of cost is incurred while full LAN interconnecting
functionality is retained, the overall cost for WAN communications can be minimized.
In many LAN protocols, the interchange of data is sporadic and frequently long periods of time exist between successive data
transfers. If ISDN calls can be disconnected during the periods of inactive data transfers without the LAN connections being
aware of the disconnection, the ISDN call time and cost is reduced.
To accomplish this, the P2600’s Connection Management function actively tracks all of the LAN connections and maintains
them while the ISDN call is deactivated. When the LAN devices require the connection to exchange more data, the ISDN call
is reactivated so that the LAN data may be transferred.
During the periods of ISDN call disconnection (suspension), each end of the LAN connection must believe that the complete
connection still exists. The generation of the regular status inquiries and responses normally generated by the two devices
involved in the LAN connection is performed by the P2600 ISDN bridge/router while the ISDN call is suspended.
Wide Area Network Topologies Supported
Two types of Wide Area Network (WAN) topologies are supported with Connection Management
1. Two P2600 routers connected.
2. Three P2600 routers connected in a star configuration.
Connection Management is not functional when P2600 routers are connected in a ring.
Call Establishment Methods
ISDN calls may be established according to the following connection methods:
1. Auto-Call
2. Address Connect
3. Manual call
4. Combination