Timing Comparison For Data Transfer By Product

Timing comparison

Timing measurements are made with the radio modems in their default configuration. The measurements are made on a pair of modems performing a loop-back test. Modem A is connected to the PC Com port and Modem B has a loop-back connector.

Time Ttot is measured from the beginning of data shifted in to Modem A to the end of loop-back data shifting out of Modem A.
Time Tlat is measured from the beginning of data shifted in to Modem A to the beginning of data shifted out of Modem B.
The testing was performed using both 32 byte and 1 byte packets as the test data.

^  ^ 	XCite XC09-009 SC / FH ^ XCite XC09-038  SC / FH  ^ XStream X09-009  ^XStream X09-019	 ^ XTend XT09 (obsolete) 115 / 9.6   ^2.4 XBee/XBee Pro 802.15.4 (S1) 115 / 9.6 ^
|Data throughput (bps) |9600 |38400	|9600	|19200	|115.2k / 9600	|250 k |
|TX Power (mW)	|5	|5	|100	|100	|1000	|1/100 |
|RX Sensitivity (dBm)	|-108	|-104	|-110	|-107	|-100 / -110	|-92 / -100 |
|Test interface rate (Kbps)	|9.6 / 9.6 |38.4 / 38.4 |9.6	|9.6	|115.2 / 9.6	|115.2 / 9.6 |
|Tlat (ms) w/ 1 byte	|15 / 48	|4.2 / 13	|48	|42	|8.5 / 71	|3.9 / 7.8 |
|Ttot (ms) w/ 1 byte	|32 / 99	|9 / 25	|99	|90	|20 / 182	|7.5 / 15.3 |
|Tlat (ms) w/ 32 bytes	|44 / 73	|10 / 18	|73	|55	|13 / 129	|8.0 / 41.3 |
|Ttot (ms) w/ 32 bytes	|129 / 184	|33 / 47	|184	|131	|30 / 264	|15.9 / 82.9 |
SC = Single Channel function set FH = Frequency hopping function set
Timing equations

  * XC09-009, X09-009
    * Tlat = 46.3 + (0.7 * B) ms, (0 < B <= 39), B = number of bytes
    * Tlat = 74.8 ms, (B > 39)
  * X09-019
    * Tlat = 41.6 + (0.4 * B) ms, (0 < B <= 63), B = number of bytes
    * Tlat = 66.8 ms, (B > 63)
  * XT09 equations have not yet been calculated.
Note: XC09 and X09 timings are accurate to within +/- 3 ms.

 
^  ^XBee 900 HP  200 K 	^XBee 900 HP 200 K	^XBee 900 HP 200 K	^XLR  Ethernet  ^
|Data throughput	|200 Kbps	|200 Kbps	|200 Kbps	|1 Mbs  |
|TX Power	        |1 mW	        |1 mW	        |1 mW	        |1 mW   |
|RX Sensitivity	|-101 dBm	|-101 dBm	|-101 dBm	|-98 dBm   |
|Test interface rate 	|9600 bps	|19200 bps	|115.5 Kbps	|10/100 Base T  |
|Tlat (ms) w/ 1 byte	|18 ms	|16 ms	|15 ms	|8 ms    |
|Ttot (ms) w/ 1 byte	|40 ms	|35 ms	|32 ms	| |
|Tlat (ms) w/ 32 bytes	|53 ms	|35 ms	|20 ms	|20 ms*  |
|Ttot (ms) w/ 32 bytes	|72 ms	|52 ms	|37 ms	   |  |
* This was done with a 128 byte packet
At the time this article was updated, the timing specifications for Ttot on the XLR PRO had not been performed.
 
^ 	^S2C  802.15.4  9.6k/115.2kbps	^S2C Digi Mesh 2.4 9.6k/115.2kbps  ^S2C Zigbee 9.6k/115.2kbps ^	XBee SX/XBee PRO SX 9.6k/115.2kbps	^XBee PRO XTC 9.6k/115.2kbps  ^
|Data throughput	|250kbps	|250kbps	|250kbps	|250kbps	|120kbps |
|TX power	|3.1/6.3 mW  63mW PRO	|6.3mW / 63mW PRO	|6.3mW / 63mW PRO	|20dBm - 30dBm |20dBm - 30 dBm  |
|RX Sensitivity	|-102dBm Boost mode  -100 dBm Normal  -101dBm PRO	|-102dBm   |-102dBm boost mode -100 dBm Normal -101dBm PRO  |-113dBm  Low data rate -106dBm Middle data rate -103dBm High data rate	 |-110dBm (10kbps)  -100dBm (125kbps) |
|Test interface rate (BD)	|9.6kbps / 115.2kbps	|9.6kbps / 115.2kbps	|9.6kbps / 115.2kbps	|9.6kbps / 115.2kbps	|9.6kbps / 115.2kbps  |
|Tlat (ms) w/ 1 byte	|8.4ms/5.8ms	|8.44ms/6.02ms	|10.9/7.2ms	|23.7ms/19.7ms	|11.64/10.44ms |
|Ttot (ms) w/ 1 byte	|16.8ms/12ms	|22.5ms/19.4ms	|22ms/17ms	|49.2ms/39.6ms	|43.2ms/36.3ms |
|Tlat (ms) w/ 32 bytes	|55ms/9.5ms	|42.6ms/9.44ms	|10.9/10.16ms	|24.6ms/20.7ms	|8.4ms/9.2ms  |
|Ttot (ms) w/ 32 bytes	|85.2ms/19.9ms	|84.4ms/20ms	|88.4ms/29ms	|115.6ms/47.2ms	|92.4ms/48.6ms |