From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 26B7AC433F5 for ; Mon, 8 Nov 2021 13:16:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0CEC360E94 for ; Mon, 8 Nov 2021 13:16:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239863AbhKHNTd (ORCPT ); Mon, 8 Nov 2021 08:19:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52560 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235636AbhKHNTc (ORCPT ); Mon, 8 Nov 2021 08:19:32 -0500 X-Greylist: delayed 999 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Mon, 08 Nov 2021 05:16:48 PST Received: from ganesha.gnumonks.org (ganesha.gnumonks.org [IPv6:2001:780:45:1d:225:90ff:fe52:c662]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 84975C061570 for ; Mon, 8 Nov 2021 05:16:48 -0800 (PST) Received: from uucp by ganesha.gnumonks.org with local-bsmtp (Exim 4.89) (envelope-from ) id 1mk4Fo-0008Ra-Cr; Mon, 08 Nov 2021 14:00:04 +0100 Received: from laforge by localhost.localdomain with local (Exim 4.95) (envelope-from ) id 1mk46x-004ORa-A2; Mon, 08 Nov 2021 13:50:55 +0100 Date: Mon, 8 Nov 2021 13:50:55 +0100 From: Harald Welte To: Arnd Bergmann Cc: Thomas Jarosch , Networking , Tilman Schmidt , Karsten Keil , gigaset307x-common@lists.sourceforge.net, Marcel Holtmann , Paul Bolle , isdn4linux@listserv.isdn4linux.de, Al Viro , Holger Schurig Subject: Re: [PATCH v2 5/5] isdn: move capi drivers to staging Message-ID: References: <20190426195849.4111040-1-arnd@arndb.de> <20190426195849.4111040-6-arnd@arndb.de> <20211108094845.cytlyen5nptv4elu@intra2net.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hi Arnd, On Mon, Nov 08, 2021 at 11:58:23AM +0100, Arnd Bergmann wrote: > When removal of mISDN came up last, Harald Welte mentioned that some > of the code is still used by Osmocom/OpenBSC[1] to drive the E1 line cards. > I'm not sure if this is still the case, of if they have since migrated > to another driver. In Osmocom (specifically, libosmo-abis which is used in osmo-bsc and osmo-mgw) We currently support E1 interfaces via three drivers: 1) mISDN 2) DAHDI 3) our new open source hardware / gateware / firmware USB-E1 adapter icE1usb https://osmocom.org/projects/e1-t1-adapter/wiki/IcE1usb via the all-userspace libusb based driver osmo-e1d https://osmocom.org/projects/osmo-e1d/wiki/Wiki The days of the use of TDM/E1 interface are also still far from over in the cellular telecom operator industry - particularly so in not-so-wealthy countries. At my company we regularly have projects that involve the requirement to drive E1 interfaces (typically 3GPP Abis, A and Gb interface), even in 2021. >From my point of view, mISDN is certainly the least used driver at the moment, given that [as far as I know] the only E1/PRI interface chipsets it supports were for classic parallel PCI bus, which is hard to find both in terms of E1 adapters as well as in mainboards. Also, the cards never supported more than 1 or 2 E1 ports, as far as I know. I would expect the majority of the users are using DAHDI based deployments (up to 8x E1 per PCIe slot), with some adventurous ones requiring few portsgoing for our icE1usb. I will inquire on the appropriate osmocom mailing list whether there are people still using mISDN. -- - Harald Welte http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)