NetComm NP2500 manual Straight-Through Cabling, Cross-Over Cabling

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In a straight-through cable, wires 1,2,3,4,5,6,7 and 8 at one end of the cable are still wires 1~8 at the other end. In a crossover cable, the wires of 1,2,3,6 are reversed so that wire 1 become 3 at the other end of the cable, 2 becomes 6, and so forth.

To determine which wire is wire 1, hold the RJ-45 cable tip with the spring clip facing towards the ground and the end pointing away from you. The copper wires exposed upwards to your view. The ﬁrst wire on the far left is wire 1. You can also refer to the illustrations and charts of the internal wiring on the following page.

Straight-Through Cabling

	Figure 3
Wire	Becomes
1	1
2	2
3	3
6	6

Cross-Over Cabling

		Figure 4
	Wire	Becomes
	1	3
	2	6
	3	1
	6	2
Note:	To prevent loss of signal, make sure that the length of any twisted-pair connection does
	not exceed 100 metres.

42	NP2500 24-Port 10/100 PoE + 2-Port 10/100/1000 WebSMART Switch User Guide
	YML842 Rev1

Image 42

Contents Page Contents RJ-45 Network Ports About this Guide PurposeTerms/Usage Introduction Fast Ethernet TechnologyGigabit Ethernet Technology Switching Technology Power over Ethernet PoEVlan Virtual Local Area Network Features Unpacking and Installation InstallationUnpacking Installing the Switch on a Desktop Installing the Switch on a RackMount the Switch in the rack Connecting Network Cable Connecting Network CableAC Power Identifying External Components Front PanelRear panel of the Switch Rear PanelUnderstanding LED Indicators System LEDsFast Ethernet PoE Port Status LEDs Port 1 ~ Gigabit Ethernet Port Status LEDs Configuration Installing the Web Management UtilityDiscovery List Web Management UtilityMonitor List View TrapAdd Item Device SettingConﬁguration Setting Delete ItemPassword Change Firmware UpgradeWeb Access Conﬁguring the Switch LoginSetup Menu Setup menuConﬁguring Setup Setting Port SettingsSetup menu Management Auto, and Disable-for speed or port disable selectionsFlow Control QoSVlan Settings Virtual Local Area Network Vlan Group SettingsTrunk Setting Trunk SettingsForward it to the sniffer port Mirror SettingRX receive mode Sniffer portPoE Setting POE Port StatusSelected port POE System Setting Select to enable or disable the PoE functionPower limit CurrentDevice Status System StatusStatistic StatisticSystem Setting ServerFrom where the IP to be login Trap SettingAddress of the manager where the trap is to be sent Abnormal* Transmit ErrorSet Password Backup SettingFunction to change the password Reset Setting LogoutPower over Ethernet GeneralCE Mark Warning PerformanceFCC Warning Vcci WarningYML842 Rev1 RJ-45 Network Ports Straight and crossover cable conﬁgurationStraight-Through Cabling Cross-Over CablingContact Information Copyright InformationCustomer Information Product Warranty YML842 Rev1