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From TeleDynamic Communications:

In this multiple part series, we’re exploring the four evils that are the curse of high quality hosted PBX: Bandwidth, JitterPacket loss and Latency.

In this final installment, we talk about Bandwidth.

What is Bandwidth?

Bandwidth is often interpreted to be the speed that data passes through a given circuit. It’s commonly measured in Kilo (thousand), Mega (Million) or Giga (Billion) bits per second. 

If your internet provider says that they provide 3 Mega bits per second, this means that the line has a theoretical transport capacity 3 million bits per second.

Does this mean that data will pass this fast? Usually not. Many other limitations can cause average data transport speeds to be less than the theoretical limit.

The key factor to keep in mind for you the IT Manager is that bandwidth is a scarce commodity. And while it’s been getting cheaper in recent years, it still costs money. And the more bandwidth you need, the more you’re going to pay. 

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From TeleDynamic Communications:

In this multiple part series, we’re exploring the four evils that are the curse of high quality hosted PBX: Bandwidth, jitter, packet loss and latency. Today’s subject is jitter.

What is Jitter?

Jitter is a little bit hard to explain. Remember when we talked about how latency is the measure of packet delays over a VoIP network. Jitter is just the variation in the time between packets arriving. In other words, it’s the variation in latency.
Each IP packet comes with a sequence number and time stamp in its header. This is how the VoIP equipment knows in what order they need to be re-assembled and when they were produced. A connection is experiencing jitter if many of packets come in at varying differences between packet time stamps.
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four horseman jitter

From TeleDynamic Communications:

Today, we’ll discuss latency.

What is Latency?

VoIP latency is the delay between when the data packets of your voice conversation is sent and when it’s received.
For most regular data like your email or when your downloading a webpage, a few microseconds of latency doesn’t impact your user experience. It doesn’t really matter that an email arrives a quarter of a second later or a website takes a moment longer to load.

Voice is Different

But voice is different. Voice is real time, for real. 
When you speak, you expect to be heard immediately. A delay of as a little as two tenths of a second, makes a voice conversation extremely challenging. The industry standard for acceptable latency for a Business VoIP conversation is only 120 milliseconds. This is less time than the blink of an eye at around 140 milliseconds!
As a way of comparison, an old fashioned analog line has a latency of about 60 milliseconds and phone calls between cell phones can be up to 150 milliseconds. Cell phones have “trained” users that noticeable voice latency is a fact of modern life.

What are the Factors That Affect Latency?

There are really 5 primary factors that affect latency in any business VoIP connection:
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