Comtech EF Data CRS-300 - Manual (Page 272)

CRS-300 1:10 Redundancy Switch MN/CRS300.IOM
Appendix B Revision 19
B-26
B.4.9 Switch-to-Modem, Quad E1 Data ‘Y’ Cable for CDM-625/A (DB-15F2X DB-9M)
You may use this cable to connect the Quad E1 data between the Switch CRS-310 RMI and the CDM-625/A Modem.
Figure B-21. CDM-625/A Quad E1 Data ‘Y’ Cable (CA-0000073)