Zhone Technologies 4821-A2 ユーザーズマニュアル

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10/100BaseT Uplink (Port 2)
4821-A2-ZN21-30
 BitStorm 4800 Express Model 4821-A2 Installation Guide
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Secure the cables as required for strain relief.
10/100BaseT Uplink (Port 2)
Port 2 is the uplink for the DSLAM. A straight-through cable can be used 
regardless of the destination interface, since the port automatically 
distinguishes between an MDI and an MDIX.
To use Port 2 as the uplink:
Connect an 8-position modular cable to Port 2.
Connect the other end of the cable to the uplink interface, such as an 
Ethernet switch.