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144 SBG1000 Wireless Cable Modem Gateway User Guide
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Configuration: Basic Gateway TCP/IP Wireless Print Server USB
S
server In a client/server architecture, a dedicated computer that supplies files or services such as file transfer,
remote login, or printing to clients.
scope The set of IP addresses that a DHCP server can lease to clients.
service provider A company providing cable data services to subscribers.
SID A service ID is a unique 14-bit identifier the CMTS assigns to a cable modem or gateway that
identifies the traffic type it carries (for example, data or voice). The SID provides the basis for the
CMTS to allocate bandwidth to the cable modem and implement CoS.
SDU service data unit
SME small and medium enterprise
SMTP Simple Mail Transfer Protocol is a standard Internet protocol for transferring e-mail.
SNMP Simple Network Management Protocol is a standard to monitor and manage networks and network
devices. Data is exchanged using PDU messages.
SOHO small office home office
spectrum A specified range of frequencies used for transmission of electromagnetic signals.
spectrum
allocation
An allocation of portions of the available electromagnetic spectrum for specific services, such as AM,
FM, or personal communications.
splitter A device that divides the signal from an input cable between two or more cables.
stateful
inspection
A type of firewall that tracks each connection traversing all firewall interfaces to ensure validity. In
addition to examining the source and destination in the packet header based on static rules, a stateful
inspection firewall:
• Examines packet headers on context established by previous packets that traversed the firewall
• Monitors the connection state and saves it in a table
• Closes ports until a connection to a specific port is requested
• May examine the packet contents up through the application layer to determine more than just the
source and destination
A stateful-inspection firewall is more advanced than a static filter firewall.
static filter A type of firewall that examines the source and destination in the packet header based on
administrator-defined rules only.
static IP
address
An IP address that is permanently assigned to a host. Normally, a static IP address must be assigned
manually. The opposite of dynamic IP address.
static route A manually-defined route.
station IEEE 802.11b term for wireless client.
subscriber A home or office user who accesses television, data, or other services from a cable service provider.
subnet mask A bit mask that is logically ANDed with the destination IP address of a packet to determine the network
address. A router routes packets using the network address.
subnetwork A part of a network; commonly abbreviated “subnet.” When subnetting is used, the host portion of the
IP address is divided into a subnet and host number. Hosts and routers use the subnet mask to
identify the bits used for the network and subnet number.
switch On an Ethernet network, a switch filters frames based on the MAC address, in a manner similar to a
bridge. A switch is more advanced because it can connect more than two segments.