Comtech EF Data CRS-300 - Manual (Page 283)

CRS-300 1:10 Redundancy Switch MN/CRS300.IOM
Appendix B Revision 19
B-37
B.4.20 Switch-to-Modem, Audio Data Cable for CDM-600/L (DB-9MDB-9F)
You may use this Type ‘D’ 9-pin cable for Audio data connections between the CRS-350 ESC Switch and CDM-600/L Modems.
Figure B-32. CDM-600/L Audio Data Cable (CA/WR9932-1)