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| -rw-r--r-- | usrp/doc/inband-signaling-gigethernet | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/usrp/doc/inband-signaling-gigethernet b/usrp/doc/inband-signaling-gigethernet new file mode 100644 index 0000000000..3bd3b43c07 --- /dev/null +++ b/usrp/doc/inband-signaling-gigethernet @@ -0,0 +1,25 @@ +Gigabit Ethernet Interconnect for the USRP2 + +At this point, this is a place to summarize design requirements, +possible solutions, point-counterpoint, etc. + + +Requirements: + +(R1) High throughput and low latency between USRP h/w and user-space. +One of the primary reasons for switching from USB to gigabit ethernet +is to increase throughput. Many users want to be be able to build +WLAN type systems, and are thwarted by the relatively low throughput +available over the USB. Eric thinks we should shoot for at least +100MB/s full-duplex into user space, using packets with payloads on +the order of 256 bytes. The small packet size is to reduce the +latency. This is important for many MACs that people want to build on +the host side. + +(R2) Non-priviledged user programs should be able to access the USRP. +Could be implemented by a priviledged daemon that actually handles the +low level communication with the USRP2. This daemon may be desirable +for other reasons, including central point of control for +arbitrating/muxing/demuxing between multiple concurrent users (e.g., +Tx, Rx, various logical channels). + |