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This article describes a method of port sharing (multiple and single) to be performed within a processor capable of supporting one or more ports.
English (United States)
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Port Manager-Multiple Port Sharing, Single Port Sharing Support
This article describes a method of port sharing (multiple and single) to be
performed within a processor capable of supporting one or more ports.
Single port sharing (SPS) and multiple port sharing (MPS) refer to the ability
for different data link control (DLC) instances of various protocol types, such as
bisynchronous DLC and high-level data link control (HDLC), to share single or
multiple hardware ports either serially or intermittently. The sharing of ports
among multiple logical links has been governed traditionally by a management
component situated above the DLC layers. The disadvantages of this method
are that it does not necessarily benefit the system to have a large number of
ports within a port group and the transfer of control of the port from one DLC to
another is a relatively slow process.
Processors presently have the ability to support a large number of ports.
Therefore, it becomes advantageous to be able to share these ports among a
number of logical links. This can be done when the links are not leased lines. In
this manner using an appropriate connection/disconnection algorithm allows the
group of ports to be shared by a much larger number of active logical links
supported by DLC. The drawing shows a communications processor in a shared
port environment. The port manager is used by the DLC function for the
establishment of the connection between the local port and the remote port o...