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CPCS Design
===========
SAP_CPCS Interface
------------------
This is the stack SAP interface between an AAL CPCS provider and an AAL CPCS
user. The stack commands defined for this interface are modeled after the
AAL3/4 and AAL5 protocol specification primitives CPCS-xxx. See the protocol
specification documents referenced below for full descriptions of the CPCS
interface.
o The following stack commands are sent from a CPCS user to the CPCS provider:
Stack Command: CPCS_INIT
Description: Initialize a SAP instance. This should be the first stack
command issued across the SAP instance after the service stack
has been successfully instantiated.
Argument 1: Not used.
Argument 2: Not used.
Stack Command: CPCS_TERM
Description: Terminate a SAP instance. This must be the last stack command
issued across the SAP instance. The stack instance will be
deleted upon completion of this command.
Argument 1: Not used.
Argument 2: Not used.
Stack Command: CPCS_UNITDATA_INV
Description: Request that an SDU be sent to the remote AAL user.
Argument 1: Pointer to an mbuf chain containing the user SDU.
(struct mbuf *)
Argument 2: Not used.
Stack Command: CPCS_UABORT_INV
Description: Not supported.
Argument 1: N/A
Argument 2: N/A
o The following stack commands are sent from the CPCS provider to a CPCS user:
Stack Command: CPCS_UNITDATA_SIG
Description: Indication that an SDU has been received from the remote AAL
user.
Argument 1: Pointer to an mbuf chain containing the peer's SDU.
(struct mbuf *)
Argument 2: Not used.
Stack Command: CPCS_UABORT_SIG
Description: Not supported.
Argument 1: N/A
Argument 2: N/A
Stack Command: CPCS_PABORT_SIG
Description: Not supported.
Argument 1: N/A
Argument 2: N/A
Protocol Specifications
-----------------------
See I.363.
Implementation Limitations
--------------------------
o The CPCS-LP, CPCS-CI and CPCS-UU parameters are not supported.
o The Streaming Mode service is not supported.
o The Abort service is not supported.
@(#) $FreeBSD$
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