Yes, you can do that: ice1usb to drive an E1 input of a E1/T1 card, T1 off that card with the same timing stability.
GPSDO-ing a card should be easy as well, the same way as manawyrm has done it in the past with HFC BRI cards.
Christoph, a German, married to a French/Russian living in the US (well a human being, right?)
Mychaela Falconia wrote on 29.02.24 at 14:48:
Hi Christoph,
I am amazed that a Digium E1/T1 card has no problem with generating a T1 clock off a E1 clock. I had expected issues as T1 has a bitrate of 8000
- 193 bits/second and 193 is a prime number. It probably uses some
hardware PLLs or the jitter on a digital is too low to be noticeable.
I am using OCTOI as an etalon at home, feeding the E1 into a 4 span card. 2 spans are in E1 mode, 2 spans are in T1 mode.
So it appears then that I should be able to use one of those Digium cards as my T1 interface, and in the interim use an icE1usb as a GPS-to-E1 timing path, until I build my own hw that would generate a timing-only T1 from a GPSDO?
Such is life: despite being Russian by birth and in many cultural ways, I see myself as an American in terms of telecom culture specifically, which is why I want T1 and not E1 even in my own self-contained lab environment.
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