Comtech EF Data CRS-500 - Manual (Page 193)

CRS-500 1:N Redundancy System Revision 2
Appendix A MN-CRS500
A-11
A.4.3 G.703 S1 / S2 RMI Data Cable (DB-9F to 4X BNC)
Use this DB-9F to 4X BNC cable to connect the modem to the CRS-505 Redundant Modem Interface (RMI).
Figure A-8. DB-9F to 4X BNC G.703 S1 / S2 RMI Data Cable (CEFD P/N CA-0000750)