# What is the XBEE3 internal buffer size ( transmit and receive )

**URL:** <https://forums.digi.com/t/what-is-the-xbee3-internal-buffer-size-transmit-and-receive/19646>\
**Category:** XBee & XBee Gateway\
**Tags:** uart-buffer, xbee3, zigbee\
**Created:** [June 26, 2018, 10:44am UTC](https://forums.digi.com/t/what-is-the-xbee3-internal-buffer-size-transmit-and-receive/19646 "2018-06-26T10:44:12Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![rowifi](https://avatars.discourse-cdn.com/v4/letter/r/6bbea6/32.png) [@rowifi](https://forums.digi.com/u/rowifi)\
**Post date:** [June 26, 2018, 10:44am UTC](https://forums.digi.com/t/what-is-the-xbee3-internal-buffer-size-transmit-and-receive/19646/1 "2018-06-26T10:44:12Z")

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On the basis that one cannot change the RF data rate, and that the host CPU has to handle the serial data coming from the Zigbee - it makes sense to impliment a buffer on the host - but if the hosts baud rate is less than that of the RF data rate there is still a possibility that the XBEE internal buffer will overflow.

Running the host at 115.2k bps may not always be possible

What is the actual Tx buffer size in the XBEE module?