GarrettCom DS60s Manual De Usuario

Magnum DS50 / DS60s Dual Speed Hubs                  Installation and User Guide (06/02)

 

device or node indicates that it is capable of 100Mbps speed, then operation on that port will be 

at 100Mbps.  If the connected device does not positively indicate that it is capable of 100Mbps 

speed, then the operation on that DS50 / DS60 port will be at 10Mbps.  Of course, the hubs’ 

auto-negotiation technique is only for 10/100 speed, and does not provide for any full-duplex 

operation. 

The per-port 10/100Mbps LK/RX LED’s on each repeater port indicate the result of 

auto-sensed speed detection, and the resulting connectivity to either a 10Mbps or 100Mbps 

device. The 100Mbps LED will illuminate (GREEN) when 100Mbps signals are detected; it 

will have a steady ON if there is no traffic and it will have a blinking ON when the port 

transmits and receives data packets. Similarly, for 10Mbps speed, it will be “off” when a 

10Mbps signal (or no reply to auto-negotiation) is detected, and it will blink if the linked port is 

transmitting and receiving. 
 

 

 

Magnum DS50 / DS60’s contain bridge logic (in the Integrated Circuit) to interconnect the two 

traffic domains and filter and selectively forward packets to allow only necessary packets to 

cross between the domains. This enables all of the users and nodes connected into either 

domain, whether 100Mbps or 10Mbps, to communicate to each other.  It also keeps local traffic 

on one domain from consuming any of the bandwidth from the other.  

 

The bridge operates in the store-and-forward mode, which filters out bad packets and 

maintains optimum performance in both domains.  Packet forwarding delay is only 5

µs (plus 

packet time).  This is much less than traditional store-and-forward  bridge products, enabling 

DS50 / DS60’s to maintain high network performance.  The bridge has a 2K node address 

capacity, suitable for use in medium-sized networks. Addresses are self-learning so that 

filtering/forwarding of 10Mbps and 100Mbps packets is maintained correctly even when users 

move their connection, change speed, or power down. 

Up-link Switch for Cascading 

The unit has an up-link switch located next to Port # 1 of the hub. It enables the port’s 

cable to cascade to another shared hub or switching hub port.  (See Section 4.4 for more details 

about up-link). Port # 1 is a dual-speed port that will sense the speed of the connected device.  

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