(1): refers
to the maximum number of frame slots HP JE073A module rack switches canplaced number.
(2) expansion
slot number: refers to the
maximum module fixed configurationswitches with expansion
slot can placed number.
(3) the
largest number of stack: refers to the maximum number of switch stackcan stacking unit stackable switches in.
Obviously, this
parameter also shows that can provide
a stack unit maximum
port density and information points.
Connect ability.
(4) to
support the network types: under normal circumstances, the fixedconfiguration without expansion slot switches support only a species
The type of network, frame type switch and fixed configuration with the
expansion slot switch can support more than one type
Network, such
as Ethernet, fast Ethernet, Gigabit Ethernet, token ring, FDDI,ATM
Etc.. More
and more network types supported
by a switch, the availability andscalability will
be stronger.
(5) the
largest SONET port number: SONET (Synchronous Optical Network,synchronization
Transmission network) is a high-speed synchronous transmission network specifications, the maximum speed can reach 2.5Gbit/s. A
Maximum SONET port number switch refers to the SONET interface of thelargest number of switches.
(6) the
backplane throughput: backplane throughput or backplane
bandwidth,the unit is the number of packets per second
(PPS), indicates
the maximum data exchange interface processor or interfacecard and the data bus can huff and puff
The amount of. A switch backplane bandwidth is higher, the ability
of data processing is more
strong, but at the same time cost
Will be higher.
(7) the
MAC address table size: connected to each port or device on a local area network needs an MAC address,
Other equipment to use this address to locate the port and the update of the routing table and special
data structure. A device
The MAC address
table to reflect the size of the largest number of nodes of the equipment can support.
(8) supported
protocols and standards: the standards and protocols to support the local wind exchange content, directly determines the intersection
The ability
to adapt to changing network.
Optional
elements of the switch
(1) dimensions
If the network is large, or have completed the comprehensive wiring the building, engineering requirement of network equipment rack focus tube
Science, elected type switch. Otherwise, the fixed configuration switches have higher price performance ratio.
(2) management
The LAN switch (especially some large switch), involved in the operation andmanagement
The same price, far more than the cost of buying. Based on this consideration,management LAN switches
(difficult program flow management, bandwidth allocation, configuration and operation) has become another evaluation switch
A key
factor.
(3) port
bandwidth and type
Choose what type of switch, the user should first according to their ownnetwork bandwidth needed to decide, then the switch port bandwidth design to consider. From the port bandwidth allocation, currently on the market are mainly the following 3 categories:
N*10M+m*100M low speed port special type: General backbone transmission rate for 100Mbit/s
full duplex, branching rate is 10Mbit/s. From a technical point of view, this kind of configuration of the LAN switches, strictly limit thenetwork upgrade, users are unable to realize high-speed multimedia network,therefore the domestic and foreign manufacturers have stopped production of this product.
Adaptive n*10M/100M port type: the switch
is the market mainstream products,because they have
the auto negotiation function (Auto Negotiation), to detectthe transmission equipment bandwidth is 100M or
10M, is a full duplex or halfduplex. When connected with the
switch card, if the card support full duplex,this link can send and receive each accounted for 100M, 200M bandwidth, the same situation may appear in the switch to switch the connection, the application environment is very relaxed.
N*100M+m*100M high speed port special type: similar to the first class switch configuration mode, the difference is not only the bandwidth to several
orders of magnitude, and the port type is also completely different. With this configuration scheme of switch, is an important equipment in the current high-speed network and optical network access scheme, which can solve the bottle neck problem, network servers such as: 3Com, 3C39024(1*1000SX+24*10/100BaseTX), 3C39036 (1*1000SX+36*10/ 100BaseTX)Gigabit uploaded to the server, to solve the bottleneck problem of server to server, but the
cost is much higher than the
first two categories of products.
(4) the
third layer switch function
The third layer switching function is the most obvious characteristics of
theswitches to offer VLAN, VLan is divided in order to shield the broadcast packets, and the network security and network control management needs.However, this can
meet the layer third LAN switch VLan high
speed communication between demand and higher prices, for small and medium-sized local system and do
not have much value. Because the
VLan is divided into the independent high network
of medium and small businesses, theinternal
network security and management basically no significance. This small
LAN can fully mature technology, more species, stable HP JE074A performance and low price of second layer switch used to
complete.
More information about switch and router, please view : http://demoploo.tumblr.com
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