This PDF SCSI 1553 Connector and Cable Assembly (13743 downloads ) contains a description of the SCSI-type cable variations provided by Alta with Alta 1553 Interface Products.
For the 1553 bus connectors, the following color-codes apply:
J1 1553 Channel 1 Bus A
J2 1553 Channel 1 Bus B
J3 1553 Channel 2 Bus A
J4 1553 Channel 2 Bus B
J5 1553 Channel 3 Bus A
J6 1553 Channel 3 Bus B
J7 1553 Channel 4 Bus A
J8 1553 Channel 4 Bus B