Tech Staff Meeting Notes November 15, 2011

The top priority is always repair of down stations.
NM problem stations
ET problem stations

Duty Table


Need to make progress on ET repairs.

News & Highlights

NetOpsVI is focused on field ops. It will be in Berkeley, CA March 27-28, 2012.

CERI Holiday party is December 16, 2-4pm.

Hanging Stations

There are several stations that have a problem with arbitrarily hanging. Mitch sent an email to the netops list but the resulting suggestions didn't really help to solve the problem.

GTTN/CPRT. These are two refteks behind a single router. They use udp to transmit data. The router opens a port when a broadcast is initiated by the reftek. The rtpd on achilles acknowledges back to the reftek on that port. When the refteks creates a new connection for whatever reason, sometimes the router port used by the router isn't the same as what the reftek or rtpd thinks it is. Steve has a "fanless pc" in house with ubuntu installed and he is about to install rtpd and rtp2rtpd. We'll test it at gnar first and if it works, get another for GTTN/CPRT. is tcp instead of udp.

GNAR. We don't know why this one keeps hanging. A better router didn't help.

RDST and MCAR are also prone to hang. They're now on gcf2ew along with a script that forces a kill and restart when necessary.

FPAL did the hanging trick too. Mitch did all the resets possible. Tom power cycled everything. Mitch reinstalled updated firmware and still it didn't work. All along we were able to get a direct connection to the reftek via rtcc but not an rtpd connection and acquisition start was on but the rtpd connection was down. Also tried stopping and restarting rtpd. Mitch changed the delay on the stream details button and uploaded the new parameters and it magically started working. I don't think this is the solution to get it working but is instead coincidental. The real problem is using udp for long haul ip comm.


There are nine remaining stations for service in 2011. Jim provided this handy list

ISIS station review.

Short Period & Broadbands

EDIT, NNAR & CHNM: NNAR and CHNM repeat through EDIT and the received signal is very bad due to trees. NNAR and CHRM are very noisy and fade out quite a bit. EDIT is now located in the Chicksaw National Wildlife Preserve so cutting trees is not an option. There isn't a clear path to a repeater on the Edith forest tower either. Need a new plan (maybe go directly to the node?).

WALK: Chris and Manning were unable to reach WALK up in the KY bend. Mr Lynn indicated that the station was completely underwater but it is still up? (yes still up).

Reinstall the rest of HDBT when internet connectivity is established (either the connection to Boswell becomes live, or we bail and move the Boswell dsl to Mud Island).

Search for quieter site for CTCT.

This list is smaller than we've had in a while. Nice work gentlemen!

Dynamic NMDown list
PLAR - to be moved
NHIN.EHE (pulled and repaired, ready for reinstall)
NHIN.EL* (decommissioned)
CHRM - repaired and reinstalled but there still seems to be a telemetry problem between CHRM and DWDM

Unk. Problem

Isis Oxidation
GLST.EHE (rebuilding hardware that came out of LEPT to install at GLST)

Muted Amplitude

NODE Tasks




Chris will purchase the 1 year term planned service agreement with Cummins.

Steve will replace the lnxtworm computer.


G and D and the local EMA installed a 25kW generator to power that side of the building. If there's room power-wise would they let us power the rack from it too? We could share the maintenance of the generator. We'd also have to install a transfer switch.

Lease renewal is complete and making the rounds for signatures.



Twisted pair from Richardson is extremely noisy causing problems with the analog backbone. Richardson is also on the UM 5-year capital improvement plan to be replaced. We got a tour of Wilder and its doable. We need to see if we can get a path to CERI so we know whether we just need to move what's on Richardson now, or whether we need to turn Wilder into an entirely new node (i.e. new mudworm). Then we can get Planning to help us with a design and then we can get permission.
We could just move the firewall from 3904/218 to Wilder and get the DBB on the campus internet that way (if there's no aironet line of site). There are good telephone pairs from from the Wilder roof to the basement and we could move the ceri node/mudworm to the basement. Otherwise we'd have to find and trust connections between the basement and CERI.


Ownership, Operation, and Maintenance of the four Charleston, SC stations (C1SC, C2SC, ADSC, and TRSC) was turned over the Univ. of SC at Columbia. At Phillip's request, we letting the data flow through CERI for the time being. Eventually it will get switched to Columbia and the network codes will then change from NM to CO.

RDST, CBHT, and MCAR are coming in via gcf2ew on anssworm. CBHT occassionally loses its connection but is overall, ok. MCAR loses its connection about twice as much so while its mostly functional, it should be better. At RDST, a datapacket sneaks through a couple times per day. So, there must be hardware problems. RDST should be fixed or removed (though if there is a hardware problem, it can't be redeployed).

Replace foam rubber plugs at all year 1 stations (need to notch it to accomodate the GPS pods): ASAR, CBHT, CUET, CVTN, HDBT, LNXT, MCAR, NAIT, SFTN & TUMT.

NAIT: Couldn't get the NWS cable modem to cooperate at NAIT (firewall?). Dean was going to ask Comcast about it and maybe get a new modem. Steve will follow up.

CVVA. John contacted DMME again. He's also looking into the possibility of a freewave link to UVA.

We need a single document (access database excel spreadsheet) to document information on all freefield strongmotion stations to include contact(s), current IP's(eternal/external), what ports are allowed in from what IP's here at CERI, telnet yes or no, trigger levels etc. etc.


Granites are at VLF for assembly.


Bad CMG5 E/W.

Not getting broadband feed.

On hold for Boswell comm.


Replace two bad mss100's.

Bad 100' accelerometer.

On hold for Boswell comm.

If we can't get the Boswell comm worked out by the Jan 1, we'll remove bowlworm and discontinue the dsl at Boswell. We'll make a wireless link from the weigh station to AZTN and look into getting additional bandwidth at AZTN. The building and bridge channels don't need to be exported continuous to CERI but the mud island and weigh station channels do. Though we may wish to have a couple of the AZTN and bridge channels on helicorders for SOH.


Dynamic ETDown list

WSNC- bad L4
CMGA-periodic down-possible weak battery

Misc Problems
see attached images
RBNC - gain channel problem? - see image
VHTN.EHN- see previous image
ETT.EHE - see image

Strong Motion problem
CSTN - still gappy
CVVA- internet connection

Only the DYTN upgrade remains. See map.
Forest service has draft agreement.


BHT move. Latest update from John:

  1. We had planned on moving BHT from it's present location because access has gotten so bad.
  2. I have been working on getting a permission to move it about 3 miles to the E NE to Black Mtn. There is some issue with the permission, but my contact with the Cumberland Trail State Park says he believes we can work it out.
  3. If this station is ever upgraded to a RefTek, it is doubtful we would be able to make the 45 mile radio shot from Black Mtn. to Starr Mtn. so we would have to find a new place to transmit to. It will not repeat through any other station, because it is either blocked by mountains or too long a shot.
  4. Previously, we had discussed trying to find another site to relocate BHT to in order to center it between WMTN and DYTN.
  5. I found a site in the Catoosa Wildlife Area called Pilot Knob Mtn, (36 deg. 322'N, 84 deg. 45'W). It is about 18 miles NE of BHT. It is at an old fire tower site and apparently there is still a good road up to it.
  6. I have also found a couple of potential sites to transmit to where we could get internet.

So, before I proceed any further, we need to decide if a replacement station for BHT should get a RefTek and if so, do we want to put the station at Black Mtn. or at another site.


Power upgrades: RBNC, and TRYN.

TRYN: Hardware is removed from the tower and will be reinstalled when the new one is complete.


Greentop is getting a new tower. When?


STLE landowner has asked that we move eq. cabinet and protect antenna monument with steel barricade.
The VLF power supplies were installed CJTR and PIGT. Still needed at NMKM and RLAP.
These stations still need to be steinerized: CVMS, MACC, HCES, MAIR, NWCC.

MAIR is now connected directly to the Water District internet. We can recover the wireless hardware.

I40 Bridge Upgrade

Granites are in house. Gave one to Greg to prototype along with the mounting hardware for all.

AG Network


Dave got a second Lacie drive.

Chris will repair/replace the abused CMG6 cables.

What equipment in the FDL is no longer needed. Mitch will call a meeting of FDL users to discuss culling the equipment. Also, the check out/in process is largely ignored--what system could be implemented that people will actually use.


NSMP Station List.


The netquakes at Olivers house will be redeployed at CERI so we can learn how to install and operate them.

The seisnet group on umdrive is at You will need your uuid and password.

The pink palace display now includes a heli connection for MPHB. Need to retrieve any remaining hardare (e.g. antenna and reciever on roof).