Comtech EF Data CRS-500 - Manual (Page 186)

CRS-500 1:N Redundancy System Revision 2
Appendix A MN-CRS500
A-4
A.3.1 Control Cable for CRS-500 CSU
 DSU
Use this control cable to connect the CRS-500 Control Switch Unit (CSU) to the Data Switch Unit (DSU).
Figure A-2. CRS-500 CSU  DSU Control Cable (CEFD P/N CA-0000234)