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About this SW version 3.50
The 7600 software version 3.50 is intended for use with the CoreBuilder 7000 (REV. C) and CoreBuilder
7000HD ( all revisions ) switch board .
This version includes new features/functionality enhancements as well as bug fixes for technical problems
found in the latest release of the 7600 card , version 3.31.
It is strongly recommend to use the CoreBuilder 7000/7000HD software version 3.50. Using this version
will provide the best level of feature support and more recent bug fixes.
The official released version of 3.50 can be identified precisely by checking the LMA menu sequence :
System/Display for compilation date of 12/10/97 at 16:23:25. The time stamp of the files themselves is
12/10/97 at 17:19 .
New Features in S/W Ver. 3.50
The following new features have been added in Software Release 3.50 :
LAN Emulation
• Frame Buffering During Move from BUS to Data Direct.
When a LEC begins transmitting data to a new destination MAC address, it first sends an LE_ARP to
the LES, and simultaneously then begins broadcasting data frames through the BUS. This continues
until a Data Direct is either found or set up between the source LEC and the destination LEC . At this
point, the source LEC would like to start transmitting through the (much faster) data direct VCC.
However, it must wait until all data sent via the BUS arrives at its destination. The LANE standard
defines a flush request frame which the source LEC sends to the BUS. This frame indicates to the
LANE process that no more frames should be sent via the BUS, and that all further frames are to be sent
via the data direct after the source LEC receives the Flush Response from the destined LEC if the time-
out for the Flush Response has been expired.
The standard defines that the destined LEC, after receiving the flush request frame and ensuring that all
frames have been sent to the destination MAC address sends a flush response frame confirmation to the
source LEC. The source LEC only begins transmission via the Data Direct path after it has received the
flush response through the Control Direct confirmation to the flush request, or a time-out has expired.
The LANE standard does not define what is done with the data that arrives at the source LEC during the
time between the LEC sends the flush request frame to the BUS, and the time it receives the flush
response. The time required to receive the flush response is normally on the order of tens of
milliseconds. The enhancement implemented in this version, stores the data arriving during the flush
period in a temporary buffer and therefore enables more reliable operation of connectionless protocols
such as TFTP and NFS that utilize UDP. It is important to note that the described phenomena with the
data received during the flush period is related to the required time interval to set-up the Data Direct
VCC.