# XBee S2C 2.4 module bad throughput **URL:** \ **Category:** XBee - DigiMesh\ **Created:** [January 13, 2023, 2:56pm UTC](https://forums.digi.com/t/xbee-s2c-2-4-module-bad-throughput/23427 "2023-01-13T14:56:58Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![AV35](https://avatars.discourse-cdn.com/v4/letter/a/dbc845/32.png) [@AV35](https://forums.digi.com/u/AV35)\ **Post date:** [January 13, 2023, 2:56pm UTC](https://forums.digi.com/t/xbee-s2c-2-4-module-bad-throughput/23427/1 "2023-01-13T14:56:59Z")
Hello, I use Two digimesh 2.4 modules (XA and XB) and they are connected two the same computer with XCTU software open. Both module have their default configuration exept for the serial rate for XA it is 57600 bps and XB it is 115200 bps. I execute a throughput test thanks to the throughput tools in XCTU and this is what i get. ![ThroughputTransparent](https://us1.discourse-cdn.com/flex016/uploads/digi/original/1X/c9764c9c78f593d579e203e6ee7993cbbae0c4f8.jpeg) In the digimesh specification the RF throughput given is 250kbps i understand that the serial link can be a limitation but i don’t understand why the throughput is so low. Thanks in advance for your help ---
**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 17, 2023, 2:42pm UTC](https://forums.digi.com/t/xbee-s2c-2-4-module-bad-throughput/23427/2 "2023-01-17T14:42:52Z")
The 250K is not the throughput. It is the fixed RF data rate the radios talk at. ---
**Author:** ![AV35](https://avatars.discourse-cdn.com/v4/letter/a/dbc845/32.png) [@AV35](https://forums.digi.com/u/AV35)\ **Post date:** [January 17, 2023, 2:46pm UTC](https://forums.digi.com/t/xbee-s2c-2-4-module-bad-throughput/23427/3 "2023-01-17T14:46:38Z")
Thank you very much for your answer. I understand that the 250 kbps is the RF rate but what do i need to do to have the 96 kbps throughput as mention in the datasheet ? ---
**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 17, 2023, 3:00pm UTC](https://forums.digi.com/t/xbee-s2c-2-4-module-bad-throughput/23427/4 "2023-01-17T15:00:45Z")
Can you provide the link to the document you are referring to? I ask as that sounds more like the 802.15.4 throughput. ---
**Author:** ![AV35](https://avatars.discourse-cdn.com/v4/letter/a/dbc845/32.png) [@AV35](https://forums.digi.com/u/AV35)\ **Post date:** [January 17, 2023, 3:03pm UTC](https://forums.digi.com/t/xbee-s2c-2-4-module-bad-throughput/23427/5 "2023-01-17T15:03:27Z")
Yes of course, here is the link : [XBee/XBee-PRO S2C 802.15.4 RF Module User Guide](https://www.digi.com/resources/documentation/Digidocs/90001500/Default.htm#Reference/r_specs_perf.htm) ---
**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 17, 2023, 3:04pm UTC](https://forums.digi.com/t/xbee-s2c-2-4-module-bad-throughput/23427/6 "2023-01-17T15:04:52Z")
That is what I thought. That is for the IEEE 802.15.4 firmware option and not the Digi Mesh version. ---
**Author:** ![AV35](https://avatars.discourse-cdn.com/v4/letter/a/dbc845/32.png) [@AV35](https://forums.digi.com/u/AV35)\ **Post date:** [January 17, 2023, 3:18pm UTC](https://forums.digi.com/t/xbee-s2c-2-4-module-bad-throughput/23427/7 "2023-01-17T15:18:16Z")
Ok, so what will be the maximum throughput value that the XB24C Digimesh 2.4 module can reach ? ---
**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 17, 2023, 3:36pm UTC](https://forums.digi.com/t/xbee-s2c-2-4-module-bad-throughput/23427/8 "2023-01-17T15:36:42Z")
I would expect it to be abut 33 to 38kbps. ---
**Author:** ![AV35](https://avatars.discourse-cdn.com/v4/letter/a/dbc845/32.png) [@AV35](https://forums.digi.com/u/AV35)\ **Post date:** [January 17, 2023, 3:54pm UTC](https://forums.digi.com/t/xbee-s2c-2-4-module-bad-throughput/23427/9 "2023-01-17T15:54:29Z")
Even for a serial datarate of 115200 bps in transparent mode ? ---
**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 17, 2023, 3:55pm UTC](https://forums.digi.com/t/xbee-s2c-2-4-module-bad-throughput/23427/10 "2023-01-17T15:55:18Z")
Yes. That is simply because the throughput is a limit of the Mesh protocol. ---
**Author:** ![AV35](https://avatars.discourse-cdn.com/v4/letter/a/dbc845/32.png) [@AV35](https://forums.digi.com/u/AV35)\ **Post date:** [January 17, 2023, 3:56pm UTC](https://forums.digi.com/t/xbee-s2c-2-4-module-bad-throughput/23427/11 "2023-01-17T15:56:04Z")
Is it possible to tell me where to find this in the documentation ? I also noticed that in transparent mode when we increase the payload size during throughpu test we also increase the throughput. I don"t understant why increasing the payload also increase throughput. ---
**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 17, 2023, 4:02pm UTC](https://forums.digi.com/t/xbee-s2c-2-4-module-bad-throughput/23427/12 "2023-01-17T16:02:11Z")
I don’t know why it is not in the Manual for the XBee 3 but it is listed at [XBee S2C DigiMesh 2.4 User Guide](https://www.digi.com/resources/documentation/Digidocs/90001506/Default.htm#reference/r_dm_throughput.htm?Highlight=throughput) ---
**Author:** ![AV35](https://avatars.discourse-cdn.com/v4/letter/a/dbc845/32.png) [@AV35](https://forums.digi.com/u/AV35)\ **Post date:** [January 17, 2023, 4:04pm UTC](https://forums.digi.com/t/xbee-s2c-2-4-module-bad-throughput/23427/13 "2023-01-17T16:04:51Z")
I succeed to have 45 kbps increasing the payload and set TO register to C1. serial rate is set to 57.6 kbps. In 115.2 kbps i can go up to 80 kbps but throughput periodically falls to 0. So i think we can go higher than 32 kbps