SEOWON INTECH CO. LTD. SWC-2100 ユーザーズマニュアル

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10. 
References
10.1 LAN CABLE Standards
LAN Cable includes straight cable (direct cable) and cross cable. 
VoIP CPE has Cable Auto Sense feature, so either of the two can be used. 
However, it is not possible of normal communication if you use the cable that does not maintain the 
#1-2 and 3-6 twisted pairs according to the regulations. Always manufacture or purchase 
regulation cables to use. 
<Structure of Direct Cable > <Structure of Cross Cable>