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ARRIS Touchstone Battery Back-up for TM3402 Voice Modem - 8 Hour Battery - SKU 1000500 - SURFboard Store
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Amazon.com: Arris TM3402 32x8/2x2 DOCSIS 3.1 Telephony Cable Modem with 2 Voice Ports TM3402A (Not Wireless) : Electronics
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