Installing and Administering OSI Transport Services

Chapter 1 31
HP OTS/9000 Resources
Supported Services and Functionality
Session Functionality
The Session layer provides cooperating applications with a standard
protocol to organize and synchronously exchange user data, and to map
user-oriented Session addresses to network-oriented Transport
addresses. The Session layer corresponds to layer 5 of the OSI reference
model.
OTS/9000 offers the following Session functionality:
• Session Protocol Version 1 and Version 2 with extended concatenation
for half/ full duplex and minor synchronization functional units. The
Session version is negotiated at connection establishment. It defaults
to Version 1 when either side is unaware of the negotiation or when
Version 1 is proposed by one side.
NOTE While Version 2 allows extended user data on calls that were not allowed
with Version 1, OTS/9000 limits extended user data size to 10 Kilobytes
maximum per Session primitive.
• Infinite Session service data unit (SSDU) size for normal and typed
data.
• The following functional units:
• Kernel
• Half-duplex
• Duplex
• Expedited data
• Typed data
• Minor synchronize
• Major synchronize
• Resynchronize
• Activity management
• Capability data
• Exceptions
OTS/9000 does not support negotiated release or symmetric
synchronization through the Session API.