When planning for voice deployments with the Cisco Unified Wireless IP Phone 7921G handset in amultifloor building with a WLAN that operates at an 11 MB/s data rate， how many decibelsreferenced to 1 milliwatt of same-channel separation are recommended between floors？（）
- A、13 dBm
- B、19 dBm
- C、25 dBm
- D、31 dBm
正确答案:B
答案解析:有
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