Enterasys csx200 Guida Utente
About the CSX200
10
CSX200 Family User’s Guide
Firmware Data Compression
The STAC Electronics Stacker LZS Compression algorithm provides a minimum of 2:1 firmware
data compression for the CSX200 over PPP and Frame Relay. Firmware data compression is
supported in software on each WAN interface for line speeds of up to 256 Kbps. per WPIM, which
is equivalent to four DS0 channels. To use data compression, compatible equipment, (such as the
CSX200, CSX400, and HSIM-W6 or other vendors’ equipment which conforms to the applicable
standards), must be in use at both ends of the WAN link. This firmware method of data
compression is used as the default, if the hardware compression module is not installed.
data compression for the CSX200 over PPP and Frame Relay. Firmware data compression is
supported in software on each WAN interface for line speeds of up to 256 Kbps. per WPIM, which
is equivalent to four DS0 channels. To use data compression, compatible equipment, (such as the
CSX200, CSX400, and HSIM-W6 or other vendors’ equipment which conforms to the applicable
standards), must be in use at both ends of the WAN link. This firmware method of data
compression is used as the default, if the hardware compression module is not installed.
HDLC
Cabletron Systems has provided the High-level Data Link Control (HDLC) protocol which is used
in conjunction with the WPIM-HDSL to conserve a user’s WAN bandwidth between two
Cabletron Systems products, over a point-to-point connection. Cabletron Systems products such as
the CSX200, HSIM-W6, and CSX400 must be in use on both ends of the WAN link for these
functions to work. The HDLC (RAW) protocol reduces the amount of overhead information that
needs to be contained within each data packet to direct it to its destination. This decreased packet
overhead provides the HDSL functions with more bandwidth to transfer user data.
in conjunction with the WPIM-HDSL to conserve a user’s WAN bandwidth between two
Cabletron Systems products, over a point-to-point connection. Cabletron Systems products such as
the CSX200, HSIM-W6, and CSX400 must be in use on both ends of the WAN link for these
functions to work. The HDLC (RAW) protocol reduces the amount of overhead information that
needs to be contained within each data packet to direct it to its destination. This decreased packet
overhead provides the HDSL functions with more bandwidth to transfer user data.
DHCP and NAT
The Dynamic Host Configuration Protocol (DHCP) and Network Address Translation (NAT)
method eliminates the expense of purchasing limited public IP addresses for each client on a local
network, and the need to re-configure a client if it is moved to a different network.
method eliminates the expense of purchasing limited public IP addresses for each client on a local
network, and the need to re-configure a client if it is moved to a different network.
The CSX200 acts as a DHCP server that allows individual clients (PCs, network equipment) to
take turns using a range of private IP addresses (often referred to as local IP addresses), and
provides optional secondary setup features for these clients on a per-port basis. The CSX200
distributes these addresses dynamically assigning a local IP address to an individual client from a
range of 253 available addresses in its table on a first-come-first-served basis. This local IP address
is then “leased” for a predetermined amount of time, which is configured for the particular port.
Each Ethernet port provides DHCP services for one Class C subnet and secondary setup features
for individual clients that support the use of a default gateway, domain name and WINs server.
take turns using a range of private IP addresses (often referred to as local IP addresses), and
provides optional secondary setup features for these clients on a per-port basis. The CSX200
distributes these addresses dynamically assigning a local IP address to an individual client from a
range of 253 available addresses in its table on a first-come-first-served basis. This local IP address
is then “leased” for a predetermined amount of time, which is configured for the particular port.
Each Ethernet port provides DHCP services for one Class C subnet and secondary setup features
for individual clients that support the use of a default gateway, domain name and WINs server.
On the Wide Area Network (WAN) side, the Network Address Translation (NAT) routing method
is used to enable clients assigned with local IP addresses to use the public IP address(es) of the
CSX200 WAN interface(s) to access the WAN.
is used to enable clients assigned with local IP addresses to use the public IP address(es) of the
CSX200 WAN interface(s) to access the WAN.