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I know of no such model number. There was a Model S, but no S125, nor Model 125. Please check model number, and repost. You can also post a message to my messgae board.
There are many Linksys Router Wireless supporting different wireless standard, such as 802.11a, 802.11b, 802.11g and 802.11n (draft n). I will summarize all wireless standards in the table.ProtocolFrequencyTypical Data RateMax Data rateRange802.11a5 GHz23 Mbit/s54 Mbit/s115 feet802.11b 2.4 GHz4.5 Mbit/s11Mbit/s115 feet802.11g2.4 GHz19 Mbit/s54 Mbit/s125 feet802.11n5GHz and/or 2.4GHz74 Mbit/s300 Mbit/s (2 streams)230 feet