On May 16th, a software upgrade of Sonnet equipment at Verizon introduced a configuration inconsistancy that caused over 30 DS3s to go down; among these, was the MKO DS3 from Manoa to Hilo. The link was down for about an hour.
"I think we should respect the submm/radio telescopes' objections to these radio transmitters. I know that if any optical telescope turns their lights on during the night, the other telescopes are very quick to call them to ask them to shut their dome and stop polluting the nighttime sky with light. I think we should follow the same guidelines for radio emission.
"I also understand that interference to instruments from radio tranmissions is notoriously difficult to a) confirm (because of sporadic transmissions) and b) eliminate. This kind of interference can affect the optical/IR telescopes as well as the submm telescopes - for example, RFI could enter the signal chain of a CCD readout. This does happen at Haleakala (although the radiated power is higher there, and the frequencies are lower than some that are being discussed).
"Additionally, I think that any permanent use of radio transmitters at the telescope facilities will significantly weaken our position with respect to requests to install repeaters and other transmitters at the summit. For example, if we say that we can tolerate 30mW at a distance of 5 meters, then why can't we tolerate 3W at 50 meters, or 300W at 500 meters distance?"
At the March meeting, CSO and SMA were asked to suggest some guidelines including a list of equipment that should not be used around the summit. However, the group recognised that there are existing guidelines in the Master Plan. It would seem silly to establish new guidelines without new information.
Mac Cooper of SMA informed us that SMA will be conducting some tests originating from NRAO. The group is very interested in the result of this study and concluded that no change should be made to the current policy until we have new information. At which time, a report will be drafted and if appropriate, recommendation to the directors for any change.
Pui Hin has copies of the pertinent pages of the Master Plan for anyone who needs them.
Concerning the moving of the UH end of the frame relay from a T1 to a DS3, Pui Hin commented on the upside and the downside. The upside is that we will have better chance for a full T1 frame relay backup. At present, UH has a T1 frame relay and is over-subscribed. The downside is that the new DS3 will be going into the same router as the the MKO DS3. So the backup is not going to work if the problem is with the router.
Pui Hin will reschedule the testing of the backup link, originally scheduled for June 5th, as soon as the link is moved and the OSPF connection tested.
Pui Hin commented that there are a couple of scenarios:
Pui Hin further remarked that we could decide on whether to prorate the costs depending on what the costs turns out to be.