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that a station with data cannot lose DQDB solves this problem by having a continuous set of packets flowing in both directions, which could be assured by the Telco These packets are small and are called cells Sending empty cells doesn t hurt the efficiency Each cell has a header that contains a busy or free bit and a request field If station D wishes to send something to station B (or to another station) serviced by the Telco on the clockwise (CW) bus, D places a reservation request on the counterclockwise (CCW) bus in the reservation field (It has been watching the CCW bus for reservations, so it has a queue of prior reservations) Each free cell arriving on the CW bus causes one to be decremented from the queue When the queue is empty, the next free cell on the CW bus can be used for transmission Yes, this system is a little complex (If you really want to challenge your powers of visualization, try to envision this happening in both directions at the same time) The point of the discussion is that it is sort of a demand-based system and there are no collisions If no one else has requested cells, then you can have them all

Within the frequency bands is a set of individual channel numbers that can be used for R/C applications For example, 30 different radio channel numbers can be used in the 75-MHz frequency band The specific channel number frequency is controlled by an oscillator called a frequency crystal, which is shown in Figure 8-4 The frequency crystals come in pairs: one for the transmitter and one for the receiver To change the channel number on your radio, you simply replace the frequency crystals Both the transmitter and receiver must use the same channel number, or the system will not work The 72-MHz and 75-MHz crystals look identical, but the crystals are not interchangeable between frequency bands In other words, putting a 75-MHz crystal in a 72-MHz radio will not work

This is the Applications Management page within the Planning Administration Console as it appears when first opened

Figure 9-10: The distributed queue dual bus (DQDB) system The problem is that the rest of the protocol layer built upon the basic DQDB access scheme makes it very inefficient The service is known as Switched Multi-Megabit Digital Service (SMDS) Unfortunately, out of the 15 MB/s of a T1, you can only use a little over one MB/s Very few customers found that the service was cost effective Another unfortunate aspect of the system is that the cells are not identical to ATM cells Thus, to use ATM for transport, these cells have to be repackaged into ATM cells The best part is that the Telco can implement it using existing T1 technology SMDS then was part of the broadband ISDN service offering What about long-haul transport That was left to ATM, which intended not to be a service per se, but as the implementation technology for broadband ISDN You can now see that ATM was

8:

intended as the core technology (invisible to the customer) to support the Telco network of the future Just as narrow-band ISDN (PRI and BRI) were intended to provide the network connection of the future, broadband ISDN service was intended to be the highrate interface ATM would be the core technology supporting all of the services from circuit-switching to packet-switching ATM as the supporting technology was not ready when broadband ISDN was announced, so the carriers couldn t provide the service All eyes turned to the new kid on the block, ATM Although not well defined, like a kid, it had lots of promise Who was to do the heavy lifting until ATM was mature Frame Relay was developed to fill the void The idea for Frame Relay came from both X25 concepts and from the D channel packet handling of ISDN Frame Relay filled the need for broadband service Few customers actually needed the nose bleed speeds of ATM, and Frame Relay was a cost-effective replacement for dedicated lines Being packet-switching, it provided bandwidth on demand ATM also provided bandwidth on demand at much higher rates

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Typical radio frequency crystal pair (courtesy of Futaba)