The present invention teaches a novel technique for properly aligning the various channel positions of an optical signal splittercombiner device, such as a DWDM, and associated optical transmitter, often a laser. A pressure monitoring module of the apparatus is coupled to external pressure lines and an external electrical interface via an easily removable monitoring module plug. Each quadrilateral segment shares one of its side members with at least one other contiguous quadrilateral segment. Events include network events, for which the service monitors the connectivity state of the machine, including whether a connection is established or lost, the type of connection and bandwidth information. With this information the grid computing system is able to successfully execute the program. An electromagnetic relay has an electromagnetic block provided with a movable contact spring 14 swung by current flowing in a coil, two fixed contact terminals 22 and 22\u2032 each having a fixed contact, a backstop 23 having two movable contact abutment portions, and a base block 2 for retaining the above components.