Attestation Letter

FCC ID: TS5-WP76-OM500

Attestation Statements

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FCCID_4026403

Applicant: Sendum Wireless Corp. FCC ID: TS5-WP76-OM500 Test Report S/N: 45461449-R2.0 ISED ID 6234A-WP76OM500 EXHIBIT 22 – ATTESTATION LETTER ©2018 Celltech Labs Inc. This document is not to be reproduced in whole or in part without the expressed written permission of Celltech Labs Inc. Page 38 of 38

Sendum Wireless Corp 4500 Beedie Street Burnaby, BC Canada V5J 5L2 +1.778.834.6689 To: Federal Communications Commission 7435 Oakland Mills Road Columbia, Maryland 21046 USA RE: RF Exposure Evaluation of Sendum Wireless Corp. Model: OM500, FCC ID: TS5-WP76- OM500 The OM500 is a very low duty cycle digital transceiver used as an offender ankle bracelet (anklet). It has two transceivers, WLAN and LTE. The LTE transmitter transmits at LTE B4 (1710 – 1755MHz) and B13 (777 – 787MHz) with a maximum conducted power of 0.216W and 0.242W, respectively. Under normal use, only the LTE transmits. The WLAN transceiver only receives beacon signals from another WLAN station. The only time it transmits is during a brief initial pairing and setup with the other WLAN station and is not worn on the ankle during that initial pairing and setup. The LTE opens data session to our monitoring server based on configuration that is only set by sierra wireless administrator called super admin. The default rate of transmission is 10 minutes. Device sends data to server (once every 10 minutes) and closes socket within 2 seconds. This results in a duty cycle of: 2s/600s = 0.00333 (0.33%) In situations offender wearing anklet needs to be actively tracked the transmission rate goes to 30 seconds and transmit of data is done within 2 seconds. This usually happens only small subset of units (< 1% in system). After 60 minutes of configured duration, the device goes back to 10 minutes transmission rate by default, unless officer extends another 60 minutes. This gives a duty factor of: 2s/30s = 0.0666 (6.67%). The device firmware is hardcoded to NOT accept any transmission rate of sooner than 30 seconds. Therefore, the maximum transmission rate, even in situations like offender missing and being actively tracked, will not be sooner than 30 seconds since the firmware on device will not accept the value < 30 seconds. Sincerely, Kerry Zoehner CTO Sendum Wireless Corp.


Document Created: 2018-09-28 11:26:04
Document Modified: 2018-09-28 11:26:04
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