Alternatively, is there a different/less expensive 2G/GPRS/EDGE radio hardware platform that is better supported by Osmocom?  I've been eyeballing some Ericcson RBS gear as well.

Also, for those of you running RBS, what solution are you using for powering it?

Thank you!

-Ben


From: Harald Welte <laforge@osmocom.org>
Sent: Tuesday, September 17, 2024 5:00 AM
To: Mychaela Falconia <falcon@freecalypso.org>
Cc: openbsc@lists.osmocom.org <openbsc@lists.osmocom.org>
Subject: Re: Ericsson RBS6000 surplus situation
 
Hi Mychaela,

On Mon, Sep 16, 2024 at 06:15:08PM -0800, Mychaela Falconia wrote:
> My question to the community: what is the current situation 6 y later?
> Is there still any above-zero supply of either DUG10+RUG or DUG20+RUS
> surplus hardware?  If a nonzero supply does exist, what is the typical
> price these days?

I think the best way to figure that out is to contact the usual surplus
traders, whom you already know from your codec experience.  The exact part
numbers of DUL, DUG, the related cables etc. should all be in the osmocom
wiki, AFAIR.

> In that 2018 presentation Harald also mentioned that the successor to
> DUG20 was DUS31/DUS41, and that those DUS units (which support GSM,
> WCDMA and LTE all in one box)

I may have been quoting wrong documentation when I made that statement.  There
are some userse who claim that [at least with the software they have], the
DUS31/41 can only do LTE.

My personal recommendation would be to stick with DUG20 + DUL20

> Hence question: has anyone in Osmocom cracked
> the E1-over-IP protocol spoken by SIU02 and its later incarnations,

I wrote the wireshark dissectors and submitted them to upstream wireshark "back in the day",
the core of it is in epan/dissectors/packet-{ehdlc,gsm_abis_pgsl,gsm_abis_tfp}.c of the
wireshark source code.

We have also implemented a proof-of-concept as osmo-el2tpd which can be found at
https://gitea.osmocom.org/cellular-infrastructure/osmo-el2tpd

As far as I recall, we only implemented the GPRS/EGPRS integration (so OML, RSL and the "GPRS TRau frame
equivalent"), and not the Voice (TRAU) frame integration.  So you could (at some point) run osmo-bsc with
bsc-colocated PCU and osmo-el2tpd talking to a SIU2 talking to a DUG02.

osmo-el2tpd exposes the TFP (the Ericsson Abis/IP equivalent of TRAU frames) on a unix domain socket, but I
don't think we ever integrated that into osmo-mgw somehow.  All information is known.

> allowing Osmocom CNI to drive the GSM part of DUS31 etc, or is such
> operation beyond our current community capabilities?

I don't think anyone has tried Abis/IP with a DUSxx or BBxxxx.  But with a real SIU02,
it was definitely working.  Of course the code may have bit-rot by now.

--
- Harald Welte <laforge@osmocom.org>           https://laforge.gnumonks.org/
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