From ffdcd91a06130cf406fb64f6c017edce96075676 Mon Sep 17 00:00:00 2001 From: Ralph Metzler Date: Thu, 16 Jun 2016 15:39:40 +0200 Subject: [PATCH] start to add some more information on ci speed settings --- docs/ci | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-) diff --git a/docs/ci b/docs/ci index 8bfca4e..dc5a839 100644 --- a/docs/ci +++ b/docs/ci @@ -1,3 +1,5 @@ +- General Information + The caX device associated with a CI device behaves just like any other caX interface. You usually use it through a library like libdvben50221 which is part of the dvb-apps package available at linuxtv.org. @@ -26,6 +28,24 @@ use the new interface. See docs/redirect for more info. +- Clock Speed + +The normal clock speed for the TS output is 72 MHz wich is the standard +speed used for CI. + +Packets are sent with an adjustable gap between the packets. +The gap size is (gap value * 2) + 4 or 0 if the gap is disabled. +So, the standard gap value of 4 leads to a gap of 12 bytes which means +that the effective data rate is (72*188)/200 = 67.68 MBits/s. + +Depending on the hardware, the clock speed can be changed with the +ci_bitrate module parameter: + +- Octopus CI, Octopus CI S2 Pro : supported + +- old CI single flex modules: supported + +- new dual CI flex module: not yet supported, use the standard 72000 kHz - +Valid ranges for are from ... to 96000 KHz.