Comtech EF Data CRS-300 - Manual (Page 280)

CRS-300 1:10 Redundancy Switch MN/CRS300.IOM
Appendix B Revision 19
B-34
B.4.17 Switch-to-Modem, Quad E1 Data Cable for CDM-Qx/QxL (DB-15F4X RJ-45M)
You may use this cable to connect the Switch CRS-305 RMI to the redundant CDM-Qx/QxL Quad E1 interface.
Figure B-29. CDM-Qx/QxL Quad E1 Data Cable (CA/WR13018-1)