# XBee S2 Throughput very Low ? **URL:** \ **Category:** XBee - 802.15.4\ **Tags:** 250kbps, xbee\ **Created:** [January 10, 2016, 11:14pm UTC](https://forums.digi.com/t/xbee-s2-throughput-very-low/16056 "2016-01-10T23:14:29Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![ates1687](https://avatars.discourse-cdn.com/v4/letter/a/f14d63/32.png) [@ates1687](https://forums.digi.com/u/ates1687)\ **Post date:** [January 10, 2016, 11:14pm UTC](https://forums.digi.com/t/xbee-s2-throughput-very-low/16056/1 "2016-01-10T23:14:29Z")
I have two XBee S2. 1 Coordinator (API mode) 1 Router (API mode) R -\> C 13A200 13A200 40XXXX 40XXXX I’m try use the XBee(router) transmission 150byte packet to XBee(coordinator). But I use X-CTU look the throughput. I’ts only have 8~9kbps throughput. What’s the problem? 250kbps? 8kbps? ---
**Author:** ![mvut](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.digi.com/mvut/32/31_2.png) [@mvut](https://forums.digi.com/u/mvut)\ **Post date:** [January 12, 2016, 1:00pm UTC](https://forums.digi.com/t/xbee-s2-throughput-very-low/16056/2 "2016-01-12T13:00:51Z")
You should have closer to 20 to 30kbps for a Coordinator to Router 1 hop connection. Try changing channels and see what happens. ---
**Author:** ![ates1687](https://avatars.discourse-cdn.com/v4/letter/a/f14d63/32.png) [@ates1687](https://forums.digi.com/u/ates1687)\ **Post date:** [January 17, 2016, 12:32am UTC](https://forums.digi.com/t/xbee-s2-throughput-very-low/16056/3 "2016-01-17T00:32:20Z")
I’m try changing channals. but also 8kbps. What’s the problem? ---
**Author:** ![mvut](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.digi.com/mvut/32/31_2.png) [@mvut](https://forums.digi.com/u/mvut)\ **Post date:** [January 18, 2016, 3:45pm UTC](https://forums.digi.com/t/xbee-s2-throughput-very-low/16056/4 "2016-01-18T15:45:22Z")
Switch to transparent mode and increase your serial baud rate to 38,400bps. Make sure that you also are using CTS flow control.