參數(shù)資料
型號： LXT9883HC
英文描述： LAN HUB CONTROLLER
中文描述： 局域網(wǎng)集線器控制器
文件頁數(shù)： 28/96頁
文件大小： 1309K
代理商： LXT9883HC
LXT980/980A Dual-Speed, 5-Port Fast Ethernet Repeater
28
Datasheet
Partition. The LXT980 partitions any port participating in excess of 60 consecutive collisions
or one long collision approximately 575.2
μ
s long. Once partitioned, the LXT980 continues
monitoring and transmitting to the port, but does not repeat data received from the port until it
properly un-partitions.
Un-partition. The LXT980 supports two un-partition algorithms. The default algorithm, which
complies with the IEEE 802.3 specification, un-partitions a port only when data can be
transmitted to the port for 450-560 bit times without a collision on that port.
The alternate un-partition algorithm is available through the management interface. The
alternate algorithm will un-partition a port on
either
transmit or receive of at least 450-560 bits
without collision on the partitioned port.
Isolate. The LXT980 isolates any port transmitting more than two successive false carrier
events. A false carrier event is defined as a packet not starting with a /J/K symbol pair. Note:
this is not the same as
“
100IRB isolate,
”
which involves segmenting the backplane.
Un-isolate. The LXT980 will un-isolate a port that remains in the IDLE state for 33000 +/-
25% BT or that receives a valid frame at least 450-500 BT in length.
/T/R generation. The LXT980 can insert a /T/R symbol pair (End of Stream Delimiter) on any
incoming packet that does not include one. This feature is optional, and is enabled through the
management interface.
Jabber. The LXT980 ignores any receiver remaining active more than 57,500 bit times. The
LXT980 exits this state when all jabbering receivers return to the idle condition.
The isolate and symbol error functions do not apply to the MII port.
2.1.4.2
10 Mbps Repeater Operation
The LXT980 contains a complete 10 Mbps Repeater State Machine (10RSM) that is fully IEEE
802.3 compliant. Any port configured for 10 Mbps operation is automatically connected to the
10 Mbps Repeater. This includes any of the four media ports if they are configured for 10BT
operation, and the MII port if it is configured for 10 Mbps operation.
The 10RSM has its own Inter-Repeater Backplane (10IRB). Multiple LXT980s can be cascaded on
the 10IRB and operate as one repeater segment. Data from any port will be forwarded to any other
port in the cascade. The 10IRB is 1-bit wide and runs at 10 MHz. It is designed to be stackable.
The LXT980 maintains a complete set of statistics on its repeater segment, as long as the MII port
is configured for 10 Mbps operation. These are accessible through the high-speed management
interface.
The LXT980 performs the following 10 Mbps repeater functions:
Signal amplification, wave-shape restoration, and data-frame forwarding.
Preamble regeneration. All outgoing packets will have a minimum of 56 bits of preamble and
8 bits of SFD.
SOP, SOJ, EOP, EOJ delays meet requirements of IEEE 802.3 section 9.5.5 and 9.5.6.
Collision Enforcement. During a 10 Mbps collision, the LXT980 drives a jam signal (
“
1010
”
)
to all ports for a minimum of 96 bit times and until the collision ends.
Partition. The LXT980 will partition any port that participates in excess of 32 consecutive
collisions. Once partitioned, the LXT980 will continue monitoring and transmitting to the
port, but will not repeat data received from the port until it properly un-partitions.
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