Ciena B-720-0024-001 Optical Protection Switch is a CN-OPS-1 module for the CN4200 platform, described as a 1×2 RX switch. In product listings it appears as "CN-OPS-1 CN4200 OPT PROTN SWG 1X2 RX SWITCH," confirming its role as a protection-switch circuit pack within CN4200 equipment. CN4200 documentation and related literature reference similar Optical Protection Switch components (for example, the Dual OpticalProtection Switch 1310 with PN B-720-0024-002), illustrating the OPS family used to protect optical paths in CN4200 systems.
