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The ability of a caller to go off-hook in a telephone world, dial digits, and then miraculously talk to someone anywhere in the world is still a mystique to many The network s capability to set the call up almost instantly and then tear it down just as fast is what really carries the mystique How can the network figure out where to send the call, get the connection, and ring the phone on the other end so quickly All of this happens in under a second and the user is oblivious as to the intricacies of what occurs What happens behind the scenes constitutes the backbone of the signaling systems The networks are now dependent on the capability of handling subsecond call set-ups and teardowns Several signaling systems have been introduced to the telecommunications networks The current one in use is called Signaling System Number 7 (or SS7) in North America In the rest of the world, this is referred to as CCITT Common Channel Interoffice Signaling System Number 7 (CCS7 for short) Although the names are different, the functions and the purposes of the two systems are the same As always, the North Americans do things one way, and the rest of the world does things a different way This is an age-old problem, but one that we have learned to deal with and adjust to The essence of the signaling system boils down to many different factors, but one of the most significant reasons the carriers employ these systems is to save time and money on the network Following that fact, the carriers are also interested in introducing new features and functions of an intelligent network, as discussed in an earlier chapter The best signaling systems are designed to facilitate this intelligence in the network nodes that are designated as signaling devices, separate and distinct from the switching systems that carry the conversations.

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Prior to the implementation of SS7, per-trunk signaling (PTS) was used exclusively in the networks This method was used for setting up calls between the telephone companies exchanges PTS continues to be used in some parts of the world where SS7 has not yet been implemented Admittedly, the exchanges using the PTS method are declining, as SS7 is gaining in its deployment worldwide However, the network is always in a state of change and this is no exception PTS sends tones or multiple frequencies (MF), as they are called, to identify the digits of the called party The trunk also provides all of the intelligence for monitoring and supervision (call seizure, hang up, and answer back) of the call Telephone systems at the customer s location (PBXs) that are not Integrated Services Digital Networks (ISDN) Primary Rate Interface (PRI)compatible use the per-trunk signaling method On a long distance call when a call set-up is necessary, each leg of the call repeats the MF call set-up procedure until the last exchange in the loop is reached In essence, the call is being built by the signaling as the progress is occurring on a link-by-link basis As each link is added to the connection, the network is building the entire circuit across town or across the country Each leg of the call set-up takes approximately two to four seconds, with the configuration shown in Figure 7-1 , or a total call set-up takes approximately six to 12 seconds (at a minimum) from end to end

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The second difficult part in building your own gearbox is fastening two gears of different diameters on a single shaft If the gears are to rotate freely like an idler gear, you don t have to fasten them securely to transfer torque between gears However, if you intend to construct an assembly like the one shown in Figure 6-2, gear number 2 and gear number 3 or sprocket number 2 and sprocket number 3 must be securely attached to the shaft to transmit torque between them This will more than likely require a hardened steel pin protruding through the gear s hub, through the steel shaft, and through the other side of the hub If the hub extends on both sides of the gear, a second pin is recommended You should always use a hardened steel pin never use a cotter pin Another method to secure gears and sprockets to a shaft is to use a keyway and a square key stock that was illustrated in Figure 3-13 Many gears and most sprockets already have one keyway machined on the inside bore A local machine shop can easily add a matching keyway in your axelshaft Whatever you do, do not use set screws to secure a gear or sprocket to a shaft They will not hold together You must also be careful to align the gears with each other within the gearbox Securing the shafts against side-to-side slop can be accomplished using collets fastened on the shaft inside the bearings If this all sounds a bit complicated, you re right It really is complicated for the first-time machinist A better way to go to achieve speed reduction is to use a chain and sprockets The distance between sprocket shaft centers can be a lot less precise to accomplish the same ratio of speed on the sprockets If your robot needs a gearbox, you should use a gearbox that has already been designed and manufactured The most common term for these gearboxes is speed reducers A wide variety of speed reducers are in use, including parallel shaft speed reducers, where the input.

Figure 7-1: Per-trunk signaling preceded SS7 but was slow This method works but is an inefficient use of the circuitry in both major and minor networks Although the call gets to its end destination, several complications could arise, causing extensive delay or incomplete calls Regardless of the complications, the outcome is the same; the carrier ties up the network and never completes the call Hence, no revenue is generated for the use of the circuits or the network This inefficient use of the network costs the carriers a significant amount of money Therefore, something has to be done to improve this method of call establishment The call establishment part of the connection could take as much as 24 seconds, then time out, and never get to its end point However, the carrier ties up parts of the network without getting a completion