At one end of the board there are two black plastic 42 pin female connectors. At the other end there are other switches and connectors of varying type. On the component side there are eight small overlapping boards populating left corner opposite the black connector.
Manufacturer
BT North America, Inc.
Place Manufactured
U.S.
Identifying Numbers
Other number
420312-001 REV D
Printed in solder in an interior layer on the solder side of the board along the right edge
Other number
430312-001 REVG
Printed in solder on the component side of the board
Other number
470312-001 REVU
Printed in solder on the component side of the board