Understanding Channels

If I have a bunch of different data services object, each data service object DOES NOT need to have a new RTMP Channel correct?

What is the benefit of adding a new RTMP channel to the channelset of dataservice object? Should I not have one or two channels setup on a channelset and ensure each dataservice uses that channelset?   Does each dataservice need to be assigned a channelset?   The destination point is fixed and is only one server.

I will always have something like this..
var myAC:ArrayCollection = new ArrayCollection;

var myDS:DataService = new DataService("myDSInfo");

myDS.autoCommit = false;

I would not need to do this for each dataservice correct?

var rtmpChannel:RTMPChannel = new RTMPChannel("my-rtmp", myServer);

var channelSet:ChannelSet = new ChannelSet();

channelSet.addChannel(rtmpChannel);

myDS.channelSet = channelSet;

Any insight on this would be great.