16■ Position in the rackWhen connecting multiple extension units to a recorder, make sure you consider the length of the provided connection cable (1 m{39.4"}).It is recommended to install the recorder in the center of the rack.The following is an example of a connection with Network Disk Recorder WJ-ND400K.Note:• When installing the extension unit in the rack, leave a space of 1U (44 mm {1.73"}) above and below the extension unit for ventila-tion.• Fix the connection cable firmly using the cable clamp.When the cable is not connected firmly or when it is disconnected, the system may become unstable or recording may fail.• Do not leave the connected cables unnecessarily long and loose. If the wiring route is unnecessarily detoured or the distancebetween devices is too far, it may cause malfunction. Do not wind the cable in a coil.• The unit numbers are only for the above connection example. Refer to the manuals provided with the recorder for how to checkthe unit numbers of the connected extension units.Extension unit(Unit number: 5)Connection cable(provided with the extension unit)Require a space of 1 unit(44 mm {1.73"})Require a space of 1 unitRequire a space of 1 unitRequire a space of 1 unitRequire a space of 1 unitExtension unit(Unit number: 4)Network diskrecorderExtension unit(Unit number: 1)Extension unit(Unit number: 2)Extension unit(Unit number: 3)