GarrettCom DS60s Installation And User Manual

GarrettCom DS60s Installation And User Manual Manual pdf 26 page image

Magnum DS50 / DS60s Dual Speed Hubs Installation and User Guide (06/02)3.2.5 Connections to NICs which support Auto-Negotiation, RJ-45 portsThe copper ports of Magnum DS50 / DS60s will function properly with NICs(Network Interface Cards) which support Auto-Negotiation, and the Fast Link Pulse (FLP)coding for the 100BASE-TX signaling system. When connecting a NIC to a DS50 / DS60, itmay be necessary to reload the NIC drivers on the user device if the NIC has beencommunicating with a protocol other than 100BASE-TX (such as 10BASE-T). When 100Mbspeed is agreed and in use, the 10/100 LED is steady ON. It is OFF if there is no traffic or ifthere is 10Mbps traffic.In cases where 100BASE-TX connection ports are used as 10BASE-T ports, CAT 3may be used. In either case, the maximum distance for unshielded twisted pair cabling is 100meters (328 ft).Media IEEE Standard ConnectorTwisted Pair (CAT 3 or 5) 10 BASE-T RJ-45Twisted Pair (CAT 5) 100BASE-TX RJ-45NOTE : It is recommended that high quality CAT. 5 cables (which work for both 10 Mbps and100Mbps) be used whenever possible in order to provide flexibility in a mixed-speednetwork, since dual-speed ports are auto-sensing for either 10 and 100Mbps. Notethat the auto-sensing function does not sense the cable type.3.2.6 Collision Domain DiameterThe Collision Domain Diameter is the length of the longest path between any twodevices in a single collision domain. A collision domain is defined as a cluster of networkdevices that are connected by means of a repeater or repeaters such that no bridging devices arepresent between any two devices in the cluster. In order to install an IEEE 802.3u compliantFast Ethernet network, the collision domain, regardless of the actual network topology, must beless than 512 BT (Bit Times). Bit Times are related to media types as shown in Table 3.2a.Table 3.2a: Worst case round-trip delay for Fast Ethernet media*Media Type Round-trip delay inBit Time per Meter (BT/m)Fiber Optic 1.000Shielded TP cable 1.112Category 5 Cable 1.112Category 4 Cable 1.140Category 3 Cable 1.140*Worst case delays taken from IEEE Std 802.3u-1995, actual delays may be less for a particular cable.Contact your cable supplier for exact cable specifications.22www GarrettCom com. .