NetIPC 3000/XL Programmer's Reference Manual (5958-8600)

Table Of Contents

40 Chapter1

NetIPC Fundamentals

Direct Access to Level 3 (X.25)

If the connection is accepted, up to 128 bytes of call user data may be

placed in the call conﬁrmation packet using IPCRECVCN. Once accepted,

the virtual circuit is open and can be used as a virtual circuit that does

not have fast select. The side that closes the connection can send

128 bytes of clear user data in the clear packet using the IPCSHUTDOWN

call. Figure 1-13 is an example of the sequence of calls used with fast

select, no restriction.

Figure 1-13 Fast Select No Restriction

IPCCONNECT

(fast select no

restriction)

(128 byes of

CUD)

IPCRECVCN

(defer conn.)

(Returns CUD,

facilities, address)

IPCRECV

(Returns CUD)

CALL Conf. IPCCONTROL

(accept)

(128 bytes of

CUD)

Connection is now established, either side can close:

IPCSHUTDOWN

(128 byes of

CUD)

IPCRECV

(Completes in

error)

IPCCONTROL

(reason)

(Returns CUD)

IPCSHUTDOWN

CALL

128 bytes CUD

CLEAR

LOCAL

NETWORK

REMOTE