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> * 5ESS line cards are pretty distinct sounding. They'll make weird noises whenever you go offhook, have a slightly higher noise floor then most line cards, an
by Aloha 10y ago
> * 5ESS line cards are pretty distinct sounding. They'll make weird noises whenever you go offhook, have a slightly higher noise floor then most line cards, and a very strange frequency response. This doesn't necessarily apply if you're using a line served out of a channel bank or something, but the line cards can give a very different experience on the phone network sometimes.
5E analog line cards are (as far as I know) are all concentrated at one level or another (think 4:1, 10:1, etc) - which means there is an analog cross point switch to tie your line up to a codec - when your line goes into permanent signal, you'll be linked up to what appears to be an analog announcement trunk, as to avoid tying up any of the TDM bandwidth on the switch.
Whereas DMS100's are codec per line, and are not concentrated in the same way. I think GTD-5's are also similar to the DMS and codec per line.
When you go off hook on a 5E you can her tick-ta-tick-tick-dialtone as it sets up the link thru the analog switching fabric - this seems to be universal to all 5E's - the 5E2000 sounds different, and I believe uses different ckt packs to do the switching, but fundamentally appears to work the same way (I've not had a chance to sit on a 5E2000 line to get permanent signal to confirm that).
- doctorshady 10y agoInteresting! Sounds like you're pretty well versed in this sort of thing. The 5ESS analog line cards seem to roll off frequencies before 3100 hertz like on most switches (a fair bit too - like, maybe anything above 2950). Do you know if this is a byproduct of the analog switching stage? I always just assumed that was a bad design decision on someone's part. As for the announcement trunks, I think the 13A/15A announcement machines, like the one on that 202-986 number, tend to break channels out into analog pairs. Sometimes you get crosstalk between the announcement pairs too - it's absolutely fantastic. For the longest time, I could've sworn the playback mechanism itself was analog between all the hiss, crosstalk, and analog source material you'd hear. For the hell of it, here's some better examples of that system. That 202 number doesn't do it justice; 512-371-3337 (listen for the weird sweep crosstalk at the end) 425-433-0021
- Aloha 10y agoI know of no difference in the performance of the line card once the call is set up (as in I can't hear any), I do know what the subscriber hears from whatever announcement trunk generates permanent signal does sound fuzzy as hell (think ringing/wooshing S's). If you wanna hear an interesting recording call 425-226-0000 - notice the lack of supe at the end of the call.
- doctorshady 10y agoHaha, nice. They still haven't made the AIS report default to disconnection? When they first installed it five years ago or so, they never migrated the database over from the old unit, so pretty much everything said that. Makes me wonder how easy it'd be to get an operator asking for a number to key into that trunk. As for the announcement trunk though, there are some 5Es equipped with other machines that sound pretty good; 503-632-1064 - ETC Digicept? 248-200-0015 - Lucent 17A (flash based replacement for the 16/-A. Lots of fun too. 0010 is the remote administration number) By the way, someone mentioned a while ago that most of the relatively recent 5ESSes encapsulate everything over ATM. The few printouts I've seen from 5Es seem to show they're capable of speaking it, but haven't sent data over the interface. Do you know if there's any truth to that?
- Aloha 10y agoYeah, it rings reorder, then busy, then after like full min after the recording is done it hangs up, it does hang up seem to hang up correctly when calling from inside that switch. I don't think so on ATM - I have some documentation for it (training manual, system architecture processor, SM/CM), and ATM isn't mentioned anywhere in it, when you consider that the 5ESS architecture was designed in the 1978-1982 timeframe, ATM would make no sense at all, it'd be a backward forklift upgrade to retrofit it. Do you have email or something, I'd love to converse further?
- doctorshady 10y agoSure! thoughtphreaker <at> shady <dot> tel