FCO DM300-F001 (DAS), Composite link probs w/data compression

This Field Change Order (FCO DM300-F001), released on July 23, 1990, addresses composite link problems with data compression, dropping links to MUXserver 300/310 and DECmux 3XXs, and various Async port issues on DM308-AA/-AB, DM316-AA/-AB/-BA/-BB, and DM332-BA/BB units (Revision E01 or lower).

The solution involves replacing the existing 54-18590-01 module with a REV FØ1 version, which is included in EQ-01580-02 kit along with a new revision label. The FCO specifies that DSRZC-F001 and DM300-F001 must be installed on adjacent MUXserver 300/310 and DECmux 3XXs for full effectiveness. Installation requires an estimated 1.5 hours and strict adherence to anti-static procedures using an ESD workstation to prevent damage to sensitive components during the logic module replacement and unit re-assembly. A quick check allows skipping the FCO if E140 on the existing module is 23-236E7-00.