Chapter 1 - Introduction & Description

1.5 System Features

1.5.1 Response Time Control

Response time control is the technique used by a mux to make sure that

no user experiences undue delays in performance due to a specific

channel using too much link time. This can occur if one of the channels

is performing a high volume batch function, such as a print dump or

program transfer.

There are a variety of priority control (response time) schemes in use by

different mux vendors. Some vendors use a switch selection approach

where each channel can be given a high, medium or low setting with the

low used for those channels requiring higher volume batch transfers.

There are also software-sensing response time techniques where the

microprocessor actually monitors channel activity, and when a high

volume is sensed, that channel is given a lower priority so it will not

crowd out the others.

The MultiMux response time control method is one where data is

transferred from each channel on a timed basis while limiting the amount

sent with each transmission.

This insures that interactive users will not experience undue delays but,

on the other hand, batch activity can still be accommodated. This,

combined with a Response Time command and the ability to shut off

channels not being used, gives the MultiMux a very efficient priority

control system.

1.5.2 Dynamic Buffering

A basic requirement of all muxes is some sort of buffering capability to

temporarily hold channel data while it is being assembled into a block. In

the early days, a mux was sometimes judged by the size of its buffers.

Large buffers are unnecessary in newer designs that include

sophisticated dynamic buffer allocation techniques where the amount of

buffer per channel is assigned on an as-needed basis.

In the MultiMux, each channel is assigned 1K of buffer, but in the case

where more buffer is needed, the MultiMux will start assigning additional

buffers from the channels not requiring it. In this way a single channel

can have up to 8K of buffer if required. When dynamic buffering is

combined with efficient flow control and the automatic transmission of

data from each channel at set intervals, as in the MultiMux, very smooth

operation for each user is the result.

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