Author Profile

Phil Hippensteel

Phil Hippensteel on Unicasts and Multicasts

In this newsletter, we will consider three modes of transmitting packets in IP networks: unicasting, multicasting and broadcasting. Most messages are unicast. That is, a single sender sends a message to a single recipient. Netflix and YouTube are based on it. Multicasting happens when a single user sends a message to a group of receivers. It is often used in IPTV, digital signage, and......

Phil HIppensteel on 802.11 Wireless (Wi-Fi) and Video

Customers who are implementing IP video systems often ponder the role wireless might play. It seems to offer some significant advantages. Two of the most promising are mobility and avoiding new cabling. But, can wireless provide the required level of video quality and security? That’s the contention we’ll investigate in this newsletter.First, a primer on 802.11 wireless. Commonly referred to as......

Phil Hippensteel on Network Errors, Loss and Mitigation

Network errors can occur at many levels during transmission of data and files.   They can happen at the physical level due to interference, reflections, defective transmitters, faulty receivers, or other factors. IP packets can be dropped if they are corrupted, incorrectly processed by switching devices, or contain invalid fields. However, the most common reason for packet loss is the......

Phil Hippensteel on cabling for AV Over IP

As the audio-video industry rushes to embrace IP, a secondary movement developed to change cabling from traditional coax, twinax, and proprietary cables to “category” cables. Most notably the favorite is Category 5E, which designed to support Gigabit Ethernet. These category cables have been specified by the TIA -568-B standard for nearly three decades. But if you look closely, you’ll find that......

Phil Hippensteel on VLANS and Subnets for AV

IT network managers often indicate that video should be on its own VLAN. Some AV vendors say that the traffic created by their devices should be on a single subnet. In most situations both are looking for a route that will segregate their traffic from other potentially interfering flows. The purpose of this newsletter is to investigate these two concepts- the VLAN and the subnet.First, A VLAN......

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