grandstream – Graves On SOHO Technology

Stormy Weather: An observation of POE Budget

Late the other afternoon we had a thunderstorm come through. Tis the season hereabouts. The wind picked up, pushing in dark clouds. The sky darkened quickly. Then the Unifi app on my Pixel 8 pinged to alert me to a network error. The network switch in our attic had exceeded its power-over-Ethernet (P.O.E.) budget.

What a novel set of events I thought. It was the first time I’d ever seen such a notification. I wonder why it occurred? It didn’t take long to work it out.

The device reporting the power problem is a Unifi USW Flex 5-port switch that lives in the attic. It receives power from the USW-24-POE main switch in the house. The POE+ (aka 802.11at) ports on the main switch can deliver up to 30 Watts over a single Ethernet cable. That is, up to its overall power budget of 95 Watts.

USW Flex can deliver up to 46 Watts when powered from a POE++ (aka 802.11bt) capable switch. When powered from mere POE+ the USW Flex is able to provide 20 Watts onward to network loads.

A Cautionary Tale of Meshes & Networks

February 28, 2017
Michael Graves
networking

ubiquiti amplifi 300px Everyone wants great Wi-Fi. That much is a given. Our homes occasionally make achieving this difficult, either by way of their sheer size or manner of construction. This is a cautionary tale about a project I undertook around our home, and its unexpected impact on our Wi-Fi.

In recent years wireless mesh networks have become quite fashionable. And why not? Providing reliable coverage in a large home may require multiple wireless access points. Pulling Ethernet cable to each of those locations (yeah, baby!) is beyond all but the most ambitious of DIY homeowners.

For the average Joe installing one central router, then plugging in a couple of more distant wireless repeaters seems so much easier. That’s a Saturday morning chore that might well ingratiate you with the family.

New Gear: Grandstream’s HT812 Analog Terminal Adapter

October 3, 2016
Michael Graves
VoIP

In the earliest days of consumer VoIP services the venerable Cisco ATA-186 was the way to connect a traditional analog telephone to one of those new-fangled Vonage accounts and save some loot. It didn’t take too long before our strategy evolved from an analog terminal adapter (ATA) plus a an analog phone or a cordless phone, to SIP desk phones and SIP/DECT cordless phones.

As such, it’s been years since an ATA held any interest at all…until last week. Last week I received a couple of notices about a new pair of ATA’s from Grandstream, the HT802 and HT812.

Grandstream HT812

The first thing I saw was a promotional email from VoIP Supply for the HT812. It described the HT812 as a two-port FXS with a built-in router and Gigabit Ethernet.

Proving An Unregistered IP Desk Phone Can Still be Useful

July 14, 2015
Michael Graves
VoIP

Here’s an admission of sorts. I quite admire Dave Michels' friend Colin Berkshire. He’s a consistent source of both wit and wisdom. For example, today he describes his somewhat unusual use of a Grandstream GXP2160 IP Telephone in My Line-less…

Grandstream On SIP For Surveillance

February 16, 2015
Michael Graves
security, Video, VoIP

VUC529 on Friday, February 20th will feature Grandstream Networks addressing issues of security and surveillance. Phil Bowers, Global Marketing Communications Manager, will be discussing their range of security cameras and new NVR-3550 network video recorder. One of the key things…

A Reader Question About A Grandstream BT-200

December 10, 2012
Michael Graves
VoIP

Grandstream-BT-200 Last week I received a question via email from reader Marshall Wilgard. It seems that he is having trouble with a Grandstream BT-200 desk phone.

For five years, I used a Grandstream BT-200 IP phone without any problems. Six weeks ago, a loud hum appeared on the phone as soon as I picked up the handset. About 10 days later, the hum vanished, for no apparent reason. However, about 10 days after that, the hum came back, for no apparent reason. Despite my rebooting the phone three times, the hum remained. Then approximately 10 days after the hum returned, it vanished again, for no apparent reason. My phone has had the latest firmware for more than a year, and my VoIP provider says the problem is not with it.

Hum like Marshal describes is usually an analog phenomenon, not something that I’d associate with firmware. It sounds to me like a problem with the hardware. Issues of hum tend to revolve around a problem with the power supply. Given the age of this phone I’d guess that most likely some kind of capacitor is failing.