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Harald Welte gerrit-no-reply at lists.osmocom.orgHarald Welte has posted comments on this change. ( https://gerrit.osmocom.org/12008 ) Change subject: lms: Use a default Tx gain value of 64 dB. ...................................................................... Patch Set 2: > Oh I got the description wrong. So actuallt the default is > "tx-attenuation oml" when no option is set, which means attenuation > is set by BSC: "Use NM_ATT_RF_MAXPOWR_R (max power reduction) from > BSC via OML". I've always thought of this as rather ugly. There is a mixture of different concepts here. The base gain setting (64..66 dB) is a property of the SDR hardware, as recommended by the hardware manufacturer in order to reach the maximum possible output level without going into saturation. This "maximum clean transmit output power" is called "nominal transmit power". The NM_ATT_RF_MAXPOWR_R is a 3GPP specified value which is operator configuration as to how manyy steps of 2dB the BTS should transmit *below* that nominal value. So the correct processing is to always use both, and subtract them. Default: Use 64..66 dBm value as base line, and substact the NM_ATT_RF_MAXPWR_R User override: specify a lower/higher base gain value instead of 64..66. -- To view, visit https://gerrit.osmocom.org/12008 To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings Gerrit-Project: osmo-trx Gerrit-Branch: master Gerrit-MessageType: comment Gerrit-Change-Id: Id018b27b1d8a2f48d60b29e688583c9a5ac49a81 Gerrit-Change-Number: 12008 Gerrit-PatchSet: 2 Gerrit-Owner: Harald Welte <laforge at gnumonks.org> Gerrit-Reviewer: Harald Welte <laforge at gnumonks.org> Gerrit-Reviewer: Jenkins Builder (1000002) Gerrit-Reviewer: Pau Espin Pedrol <pespin at sysmocom.de> Gerrit-Comment-Date: Thu, 29 Nov 2018 16:24:04 +0000 Gerrit-HasComments: No Gerrit-HasLabels: No -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/gerrit-log/attachments/20181129/f2e24af9/attachment.htm>