After last night’s testing, we suspect the most probable cause of the performance problem at Mockingbird is a bad customer roof unit radio hashing our tower. We’ve exhausted all the minimally invasive tests we can run. Starting tonight, we’re running a Big Sleep test on all our Mockingbird subscriber units. Continue reading
Mockingbird Tower subscribers (only) will experience a short service outage of 15-30 minutes this afternoon (Saturday), as the tower is being taken down for regrounding and recabling work to help address the RF issues causing poor performance from this tower.
After several abortive ordering attempts (in which “in stock” on a website listing apparently translated to “let us check our warehouse” once the order was placed), we located a dealer with a replacement antenna actually in stock. We have been verbally assured that our replacement unit shipped yesterday, and are awaiting written confirmation including a tracking number. In the absence of nasty surprises, we plan to be replacing the Mockingbird central antenna this weekend.
We are also going to be subjecting the Rio Vista antenna (same manufacturer and model) to testing to determine if it shows any early symptoms of the same failure mode, in case a prophylactic replacement is indicated.
After two nights of record windstorms, today (Sunday) was devoted to an impromptu “tower tour,” driving around our service area and checking for visual confirmation of proper aim on the majority of our towers.
The Easy Street input feed dish had been blown clockwise about 70°. (The Easy Street neighborhood itself was pretty slammed, with roads strewn with wash silt and downed trees; our host’s flagpole was actually bent in half by the winds!) Without a roof man, given that the dish was far above my reach, I attempted a rough re-aim job by “pokin’ a stick at it” (our 16′ telescoping pole) from a ladder, with surprisingly satisfactory results.
The output feed from the NOC to 251st Avenue had also been blown off kilter, and was re-aimed in the same manner. The mast has gone a bit wobbly over time, which will be addressed when we can schedule Dave, our roof man, to fine tune and lock in all of today’s crude readjustments.
One thing these storms made quite apparent is a need for more UPS power capability than we currently enjoy. Although the NOC, Constellation Tower, and our Wickenburg gateway are hardened by indoor UPS systems that provide them about 90 minutes of emergency power, most of our towers have no UPS. During the last two nights of power outages in central Morristown and Castle Hot Springs, all our Morristown tower subscribers were taken offline immediately because no power was available to our windmill tower—even though the NOC continued operating (and serving 251st Avenue, which suffered no extended power outage either night).
As funding allows, we plan to begin introducing indoor UPS systems at host-based towers, which is technically simple—weatherproof UPS units for the standalone towers (Morristown, Mockingbird, and Rio Vista) are expected to be more problematic, but a search for suitable equipment is on our immediate agenda.
In addition, it’s clear that the sheer amount of equipment installed at the NOC and the gateway locations deserves beefier UPS units that can provide more than 90 minutes of outage protection, since when these locations go dark, many or all towers lose service.
There’s nothing like weather problems to trigger a Red Queen Marathon: a situation where you must run as fast as you can just to stay in the same place. We’re going to be running one of our own over the next few months, to better prepare ourselves for future monsoon devilry.
(And the weatherman says there is 45% chance of a third record windstorm tonight.) 😭
The last two nights of record monsoon windstorms have caused us an unusual number of headaches.
The latest: the feed radio at the Easy Street neighborhood tower appears to have been blown a bit off aim by the recent high winds. Easy Street subscribers may see slower than usual network performance until we can dispatch a technician to reaim the unit.
As part of the process of analyzing a strange signal performance problem affecting a handful of Mockingbird tower subscribers, we have determined that the recent heat wave has actually warped the Mockingbird mast. The bend is causing eastbound signal to impact the terrain in Rio Vista Hills, creating destructive interference, increasing packet retries, and slowing down internet speeds to a few subscribers located on or near the 295th Avenue corridor in Rio Vista Hills and served by the Mockingbird tower. This problem does not affect other subscribers of Mockingbird Tower, nor does it affect subscribers in Rio Vista Hills served by the Rio Vista tower.
We are scheduling maintenance on the tower as heat forecasts and crew schedules allow. We hope to have the signal anomaly corrected by the middle to the end of next week.
What appears to be a power supply problem at Mockingbird Tower is currently affecting network speeds to subscribers of Mockingbird West access point and Rio Vista Tower. Subscribers of Mockingbird Central access point are not currently affected, but may become so before the repair is scheduled. We will be running a repair crew out to the tower at around noon tomorrow. Details follow. Continue reading
We’ve determined that the radio card on Morristown Tower West is souring, delivering unacceptable performance to subscribers, and requires replacement. We expect a replacement unit to arrive today, and the replacement activity to occur between 3-5 PM, requiring a brief service outage of around 15 minutes. The West AP serves Morristown subscribers west of the ADOT traffic sign on eastbound US 60 out to the end of Quiet Hills Road (except for subscribers in that area served by Skip-In Ranch Tower). Subscribers served by Morristown South and East APs will not be interrupted.
CenturyLink will be performing software upgrades on its equipment serving our network sometime between 11 PM Thursday, April 6, and 5 AM Friday, April 7. The outage should be no more than ten minutes.