Telco Network Engineering
In the past I setup FreeRADIUS, BRASes, framed IPs and the like. I knew a little bit about PPPoE But I d never dug into the ADSL / VDSL side in any great depth, and always felt like a bit of a blind spot. But as fewer and fewer DSL lines are in service, I Continue reading Adventures with DSL
I wrote not to long ago ruing the fact I d never done 3G, and despite the fact I own a bunch of 3G Small Cells, all purchased with the ambition of getting UMTS up and running, never having succeeded. But recently on the Osmocom Discourse user Tempest has been playing with old AT T 3G cells Continue reading 3G at last!
Sometimes I wonder how much crack kit vendors and operator's marketing teams smoke, and if they ever talk to end users...
For a long time I ve run my own backups to a portable hard drive using Duplicity / Dejavu. It s worked really well, it s dammed slow to pull back a file I ve accidentally deleted, or need an old version of (which I probably go back to every 6 months or so), but it s fast to backup, Continue reading Adventures with Tape
I was recently asked by a potential customer if we supported Gx over Gy. I d never heard of this before, so I gave my standard If it s in the spec we should support it, but I ll check answer, and got them to send me a PCAP, which I ve got. This is weird. So for starers, Continue reading Tales from the Trenches Gx over Gy?
There s a cool feature in PFCP that allows you to redirect traffic, which I ve written about before. But there s a funky thing that s left me scratching my head, in the Redirect information IE, you can set a SIP URI. That d be great and all, but PFCP is all about packets not about calls. So what s Continue reading PFCP and SIP Redirect
PFCP includes a Redirect Information IE, which if set, allows you to change the forwarding action in PFCP to Redirect traffic. We use this for walled garden redirects, when the OCS reports credit exhausted to the PGW-C, the PGW-C can tell the UPF (PGW-U) that all the traffic from a given subscriber should be redirected Continue reading Walled Gardens Redirection in 4G/5G (RedirectInformation)
I rooted my WebOS TV. I m trying to shift away from all the garbage that comes with so many Android app, the LG app that acts as a TV remote in particular caught my ire You need to sign in and give it location permission just to control the TV, and stream the audio Continue reading WebOS remote without the bloat
This is an idea I ve been kicking around for a little while A single GSM TRX being broadcast across multiple cell sites. Generally in GSM land, a TRX is a cell or a sector but it doesn t need to be. Later in GSM features like antenna diversity allow the same signal to be Continue reading GSM SuperCell
I have run AMPS (1G) in my lab. I ve run 2G (GSM) networks in production. There s a few dozen production LTE/5G networks out there I ve put my stamp on, but Never, have I ever, run UMTS. And that feels like a blind spot. Sure, core wise 3G it reuses the 2G core (MSC / SGSN Continue reading Adventures not building 3G UMTS RNCs