3Com Router 3012 Installation Manual

3Com Router 3012 Installation Manual Manual pdf 53 page image

Serial Port Cable 53LAN Switch. Straight-through network cables are delivered along with therouter.■ Crossover network cable — The sequences of the wires crimped at the RJ-45connectors of the two ends are different. The cable is used in the connectionbetween the terminal device, such as a PC or a router, and another terminaldevice. You can create this cable yourself, if necessary.Table 27 describes straight-through network cable pinouts.Table 28 describes crossover network cable pinouts.You can use Table 28 as a reference while distinguishing or preparing the twokinds of Ethernet cables. While preparing the Ethernet cables, follow thechromatogram given in this table to arrange the wires. Otherwise, communicationquality will be affected even though the equipment at two ends is connected.Serial Port Cable The synchronous/asynchronous serial port cable is connected to a DB-50receptacle. You must select the appropriate cable for the protocol.Table 27 Straight-through Network Cable PinoutsRJ-45 SignalCategory 5twisted pair Signal Direction RJ-451 TX+ White (Orange) —> 12 TX- Orange —> 23 RX+ White (Green) <— 34 - Blue - 45 - White (Blue) - 56 RX- Green <— 67 - White (Brown) - 78 - Brown - 8Table 28 Crossover Network Cable PinoutsRJ-45 SignalCategory 5Twisted Pair Signal Direction RJ-451 TX+ White (Orange) —> 32 TX- Orange —> 63 RX+ White (Green) <— 14 - Blue - 45 - White (Blue) - 56 RX- Green <— 27 - White (Brown) - 78 - Brown - 8