User manual D-LINK DES-5024

[. . . ] DES-5024 Fast Ethernet Switching System User's Guide Rev. 01 (January, 1999) 651DES32. K15 Printed In Taiwan RECYCLABLE i Copyright © 1999 by D-Link Systems, Inc. All rights reserved. D-Link Limited Warranty Hardware: D-Link warrants its hardware products to be free from defects in workmanship and materials, under normal use and service, for the following periods measured from date of purchase from D-Link or its authorized Reseller: Product Type Complete Products Spare parts and spare kits Warranty Period One year 90 days Your dealer, or your nearest D-Link office, can advise whether a longer period of warranty applies to your purchase, and if so, can provide you a separate certificate of supplemental warranty. The one-year period of warranty on complete products (or such longer period of warranty as may be offered as to your purchase) applies on condition that the product's Registration Card is filled out and returned to a D-Link office within ninety (90) days of purchase. A list of DLink offices is provided at the back of this manual, together with a copy of the Registration Card. [. . . ] Follow these steps to enter user changeable information: Select the field you would like to edit. Follow screen prompts. Managing the DES-5024 40 Fast Ethernet Switching System User's Guide System Reset The System Reset panel, displayed in Figure 20, enables you to reset the DES-5024 without powering off. Figure 20: System Reset Some configurations will require you to reset the DES-5024 in order for them to take effect. Screen prompts will tell you to reset the DES-5024 as needed. Follow these steps to reset the DES-5024: 1. Press Enter. Managing the DES-5024 41 Fast Ethernet Switching System User's Guide Factory Reset The Factory Reset panel, displayed in Figure 21, is used to reset the DES-5024 and restore all factory default values. Using this panel erases all configurations and customization. Figure 21: Factory Reset Follow these steps to restore factory default configurations: 1. You will see a confirmation panel, displayed in Figure 22. Select No to return to the System Configuration menu. Press Enter. Managing the DES-5024 42 Fast Ethernet Switching System User's Guide Figure 22: Factory Reset confirmation Follow these steps to exit the panel without restoring factory default parameters: 1. Press Enter. Managing the DES-5024 43 Fast Ethernet Switching System User's Guide System Rate Control The System Rate Control panel, displayed in Figure 23, allows you to set the packet forwarding rate on the DES-5024. There are two options: Store & Forward and CutThrough. Figure 23: System Rate Control The DES-5024 can be set for Store and Forward or Cut-Through. This is a global setting that affects all the ports except the RS-232 port. Store and Forward means that when the DES-5024 receives an incoming packet it "stores" the packet until the entire data packet has been received before it "forwards" the packet to a destination. In Cut-Through mode the DES-5024 begins sending out the packet as soon as it receives the first 128 bytes of data. The first 128 bytes contain the destination of the packet. Advantages of Store and Forward Store and Forward only sends out valid data packets. Bad packets created by collisions on the network or damaged packets are filtered out. Always use Store and Forward when some devices on the network run at 10 Mbps and others run at 100 Mbps. Disadvantages of Store and Forward Store and Forward requires more time because it receives the whole packet before sending it out. Every byte buffered is an additional eight microseconds of delay. For Managing the DES-5024 44 Fast Ethernet Switching System User's Guide example, 1500 byte packets are delayed by 1200 microseconds in a Store and Forward device versus 60 microseconds in a Cut-Through device. Store and Forward requires more memory because the DES-5024 must store the packet before sending it out. Advantages of Cut-Through Cut-Through is faster because the packet is sent as soon as the first 128 bytes are received. Cut-Through requires less memory since the DES-5024 only reads the address but does not store the entire message. Disadvantages of Cut-Through Bad packets are perpetuated, taking up bandwidth. The benefits diminish in high traffic networks. [. . . ] 57 status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52, 64, 68, 73 Store and Forward . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Super User . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ]