Overview of the Model 281xSA Hub
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893-743-A
Features
Each Model 281xSA Ethernet Hub has the following features:
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Support for all RMON groups except packet capture and filter
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Flash memory that allows local loading of image and configuration data
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Sixteen IEEE 802.3i 10BASE-T ports:
–
Shielded modular RJ-45 jacks for unshielded twisted pair (UTP) cable
or shielded twisted pair (STP) cable using a Model 822 10BASE-T-to-
Type 1 Adapter
–
MDI/MDI-X configuration switch for port 1 to connect the Model
281xSA hub directly without using an external crossover cable or
adapter
–
MDI-X-only configuration for ports 2 through 16
–
Per-port automatic link integrity test function
–
Per-port automatic disconnection (autopartition) of a port for too many
consecutive collisions or a collision that is too long)
–
Aut/– polarity detection and correction of the receive data
wire-pair for each port
■
One AUI port (on the Model 2813SA hub) for connecting an Ethernet
IEEE 802.3 transceiver—allowing connection to another network hub,
station, or segment using coaxial, fiber optic, or twisted pair cable
or
■
One optical port (on the Model 2814SA hub) for direct connection to fiber
optic cable
■
Front-panel LEDs displaying link and partition status of each port, power
status, data activity, collision, and AUI partition or fiber optic link status
■
Front panel system operation display showing network utilization
■
Front-accessible reset button
■
One service port, implemented on a DB-9 plug, for connection of a
terminal