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Timing Comparison For Data Transfer By Product

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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 X09-009XStream
X09-019
XTend XT09
115 / 9.6
2.4 XBee family 115 / 9.6
Data throughput (bps)960038400960019200115.2k / 9600250 k
TX Power (mW)5510010010001/100
RX Sensitivity (dBm)-108-104-110-107-100 / -110-92 / -100
Test interface rate (Kbps)9.6 / 9.638.4 / 38.49.69.6115.2 / 9.6115.2 / 9.6
Tlat (ms) w/ 1 byte15 / 484.2 / 1348428.5 / 713.9 / 7.8
Ttot (ms) w/ 1 byte32 / 999 / 25999020 / 1827.5 / 15.3
Tlat (ms) w/ 32 bytes44 / 7310 / 18735513 / 1298.0 / 41.3
Ttot (ms) w/ 32 bytes129 / 18433 / 4718413130 / 26415.9 / 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 throughput200 Kbps200 Kbps200 Kbps1 Mbs
TX Power1 mW1 mW1 mW1 mW
RX Sensitivity-101 dBm-101 dBm-101 dBm-98 dBm
Test interface rate 9600 bps19200 bps115.5 Kbps10/100 Base T
Tlat (ms) w/ 1 byte18 ms16 ms15 ms8 ms
Ttot (ms) w/ 1 byte40 ms35 ms32 ms 
Tlat (ms) w/ 32 bytes53 ms35 ms20 ms20 ms*
Ttot (ms) w/ 32 bytes72 ms52 ms37 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.

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