Part JD594A is compatible in the following Models:

HPE MSR Router Flexible Interface Cards (FIC)

HPE 4-Port FXS FIC A-MSR Module - JD594A

HPE MSR50 Series

HPE A-MSR50-40 Multi-Service Router - JD433A
HPE A-MSR50-60 Multi-Service Router - JF231A
HPE A-MSR50-40 DC Multi-Service Router - JF285A
HPE MSR50-60 Rtr Chassis w DC PwrSupply - JF640A