敝人剛剛去查了
Cisco 667的網路英文說明書
上面Figure 2-6: Rear Panel Cabling Diagram 這篇
的Step 2 Connect the Ethernet cable.
提到
If the computer at the customer premises has only a single Ethernet-equipped computer, attach the Cisco 677 to the computer's Ethernet adapter with the crossover cable provided. Otherwise, connect the Cisco 677's Ethernet port to an Ethernet hub via a straight-through cable.

這段我就可以確定了
如果是接到單機的網卡
用crossover cable
如果接HUB用straight-through cable.平行未跳線的線
如有錯誤
歡迎討論