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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

  • They understand the continuing value that their Avaya/Nortel (or British Telecom equivalent) Phone Systems deliver – Reliability, Cost effectiveness.
  • They all want to squeeze all the practical Productivity they can from their Phone Systems.
  • They want their Nortel Phone Systems to continue to perform reliably, for as long as possible.
  • Their Staff need to get their Nortel Voicemail messages on their smartphones, so that they can stay in close contact with Customers, Prospects, Colleagues and Family. This is the fundamental core of Unified Communications.
  • They won’t exchange their Nortel Phone Systems for new technology until a clear, similarly reliable winner emerges from the stormy sea of competing systems, “standards” and punditry.

If you would you like to get even more mileage from your Nortel Norstar/Callpilot or BCM Phone Systems, simply, reliably and affordably, please give our proven software solutions a Test-drive. We’ll give you 30 days of safe driving, for up to 5 passengers. Just click on the green “Download” button. No seat belts required!

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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