In previous posts in this series, we’ve performed the analysis necessary to classify traffic, determine how it will route, and compute the volume of traffic the WAN link will be carrying. Thanks to Erlang traffic models, we have also determined the number of simultaneous calls the WAN needed to be sized. While all of this […]

Anytime we’re working on a VoIP deployment, we need to ensure the network is able to support the new application. In addition to obvious requirements including quality of service (QoS), power over Ethernet (PoE), and security planning, it may be advisable to do a bit of traffic engineering. The end product of the traffic engineering […]

There tends to be confusion on how Bandwidth (BW) versus Bandwidth Remaining is actually calculated, and which is best to use in defining bandwidth requirements within a CBWFQ system or LLQ. In order to clarify the differences, let’s look at a typical configuration which could easily explain how bandwidth is calculated; and then look what the […]

Call Admissions Control (CAC) prevents over-subscription of the VoIP network by counting the number of calls on a network. Acting like a network traffic cop, CAC disallows VoIP calls to traverse a network when the network has reached its maximum number of VoIP calls allowed. CAC mechanisms complement the capabilities of Quality of Service (QoS) […]

When integrating a Voice over IP (VoIP) system into an existing network it is very important to have a good understanding of how much bandwidth is utilized for each call on the network. For most people, just starting out the bandwidth calculations can be a very daunting task. But, with a basic understanding of the […]

Having been an instructor for over 50 years, I am cursed with one of those syndromes that are often developed by those who teach. For example, if my beloved wife asks me what time it is, I am more than likely to respond with the following: There are various opinions about the first civilization to have […]

Telepresence is a set of technologies that allow video conferencing in such a way that the user feels as if they are actually at the remote site. Cisco sells a variety of platforms in the telepresence space supporting up to three 65” high definition video displays, at up to 1080p resolution and 48khz wide-band spatial […]