Abstract: A sensor mount assembly including a housing, fastener and a lever mechanism. The housing contains a sensor having two electrical leads and includes an integral flange adapted to receive a fastener. The fastener includes a body and a head. The body is received in the flange to secure the housing to a mount. The lever mechanism is proximate the flange and includes a contact block and a conductor. The contact block is acted upon by the fastener head to move the lever mechanism and, hence the conductor, between a first position and a second position. The first position corresponds to an unmounted sensor and creates a short circuit condition between the two electrical leads. The second position corresponds to a properly mounted sensor and creates an open circuit between the two electrical leads such that the electrical circuit path of the overall system includes the sensor within the housing.

Abstract: A telecommunications apparatus 10 includes a sub-rack unit 15 and a plurality of plug-in units inserted from a front side of the sub-rack unit 15 in a Y1 direction and mounted in the sub-rack unit 15. The plug-in unit 16 includes a plug-in unit main body and an aluminum case 41 that covers so as to envelope the plug-in unit main body. An intermediate guide rail member 22 is inserted from the front of the sub-rack unit 15 and mounted by tightening a lock bolt member similarly inserted from the front of the sub-rack unit 13.