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Motorola
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Abstract
The current method of servicing asynchronous links (i.e. site links, MBX links, etc.) is a serial oriented process. The zone controller first checks to see which ports have data waiting, and then the data is read. Figure 1 demonstrates this. If 48 ports have data pending, port 1 will be processed, then port 2, and so on, until port 48 is the last one to have its data read.
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MO7VROLA
8
IMPROVED ZONE CONTROLLER SERVICE METHOD
by Mark Zollner
1 CURRENT SERVICE METHOD
OF ASYNCHRONOUS PORTS
The current method of servicing asynchronous links (i.e. site links, MBX links, etc.) is a serial oriented process. The zone controller first checks to see which ports have data waiting, and then the data
is read. Figure 1 demonstrates this. If 48 ports have data pending, port 1 will be processed, then port 2, and so on, until port 48 is the last one to have its data read.
SITE 1 SITE 2 SITE 3 SITE 47 SITE 40
0 0 0 l ** 0 0
PORT 1 PORT 2 PORT 3 PORT 47 PORT 48
HIGHEST PRIORITY LOWEST PRIORITY
DIRECTION Of SERVICE
Fig. 1
If a port has an ISW or other call activity infor- mation waiting on the link, it might take a while before it is processed. For example, in Figure 2, if ports 1 through 46 have a link maintenance packet and ports 47 and 48 have call information packets, it will take a long time before the call activity packets
are read from the link. In fact, ifit takes an % milli- second to process a port, it might take 23 millisec- onds (46 ports * % ms) before the call information is even read from the link. The time will even be longer since each link maintenance packet causes some other activity (i.e. acknowledgments to the sites).
SITE 1 SITE 2 SITE 3 SITE 47 SITE 48
@ @ @ l ** @ @
PORT 1 PORT 2 PORT 3 PORT 47 PORT 48
HIGHEST PRIORITY LOWEST PRIORITY
DIRECTION Of SERVICE
Fig. 2
0 Momala. 1°C. 19%
I3
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MOTOROLA Technical Developments
2 IMPROVED METHOD OF involving ports 47 and 48, the...