Netopia 4752 2a4na 用户手册

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B-2  Administration Guide
Because over 300,000 lines are already deployed using HDSL, ser vice providers feel comfor table with SDSL 
since it uses the same technology as its predecessor and ISDN. The line coding employed by both HDSL and 
ISDN has not caused any inter ference with existing ser vices like T1. This means ser vice providers deploy SDSL 
solutions without worr y about impact on other ser vices in neighboring binder groups.