C2G/Cables to Go 25391 Serial RS232 DB9 Null Modem Cable with Low Profile Connectors M/F - Plenum CMP-Rated (75 Feet) Low Profile Connector Length: 1.25 inch Rounded Connector fits 1.25 inch I.D. Mounts 28AWG CMP Cable can be used as a substitute when the following cables ratings are specified:CL3P, CL2P, CMR, CL3R, CL2R, CMG, CM, CL3, CL2, CMX, CL3X, CL2X Connector 1: Low Profile DB9 Male Connector 2: Low Profile DB9 Female Provides serial connectivity for installation in plenum spaces