READERS' RESPONSES AND CORRECTIONS

Computing

ISSUE 266 - Ghanaian powerline test

One reader who prefers to remain anonymous wrote:" This Cactel thing is hilarious. Electricity Corpotration of Ghana's problem is not just electricity dropping out from various large areas, it's also line faults, which will take down the Cactel signal. Then there is the additional question as to whether the Cactel network and subscriber equipment will survive the ECG surges - I get voltages at my house between 160 and 380 volts. And the marketing concept - if they had to find something that inspires less consumer confidence than Ghana Telecom, it's gotta be Electricity Corporation of Ghana".

Another reader reports getting powerline delivered bandwidth in a hotel in Maputo.

The third paragraph of the article should have read: Deployment is carried out by installing a capacitive coupling unit to the medium voltage transformer feeder serving a particular low voltage transformer. A high speed master modem is then connected safely to the electrical grid via the capacitive coupler. Another coupling device is connected to the low voltage transformer which serves all the buildings connected to it. The coupling device allows the master modem to safely transmit its bandwidth signal through the same cable as the electrical signal. A medium-voltage sub-station typically has a 3-kilometre range but this can be extended by deploying what is called a Home Gateway which includes a modem and repeater to boost the signal strength.

The 200 mbps chip is currently available for commercial deployment.