From f3dc728e892b0b6fd1e5f607dd6a5dc3a4c7e144 Mon Sep 17 00:00:00 2001
From: Jeff Hill
All Channel Access (CA) configuration occurs through EPICS environment variables. When searching for an EPICS environment variable EPICS first looks @@ -272,7 +269,8 @@ Since hardware broadcasting requires special hardware capabilities, we are required to provide additional configuration information when EPICS is extended to operate over a wide area network (WAN).
-Channel Access is implemented using internet protocols (IP). IP addresses are divided into host and network portions. The boundary between each portion @@ -320,10 +318,10 @@ standardized facilities such as mail or file transfer. Port number between 1024 and 5000 are typically reserved for ephemeral port number assignments.
-Typically vxWorks hosts boot with routes configured for the host's subnet. -If a EPICSsystem is operating in a WAN environment it may be necessary to +If a EPICS system is operating in a WAN environment it may be necessary to configure routes into the vxWorks system which enable a vxWorks based CA server to respond to requests originating outside it's subnet. An EPICS system manager can limit access to a particular host by not providing routes in that @@ -422,7 +420,8 @@ already reserved the defaults.
-If the CA client library does not see a beacon from a server that it is connected to for EPICS_CA_CONN_TMO seconds then an echo message is sent to the @@ -441,7 +440,7 @@ point seconds. For efficient operation it is recommended that EPICS_CA_BEACON_PERIOD be set to at least one half of the value specified for EPICS_CA_CONN_TMO.
-Starting with EPICS R3.14 all of the libraries in the EPICS base distribution rely on facilities built into the operating system to determine @@ -502,7 +501,7 @@ placed in the variable EPICS_TS_MIN_WEST.
-The environment variable EPICS_CA_MAX_ARRAY_BYTES determines the size of the largest array that may pass through CA. This parameter must be set @@ -512,7 +511,7 @@ communication. If EPICS_CA_MAX_ARRAY_BYTES free list of larger data buffers is established when clients request transportation of large arrays.
-