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Glossary

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Glossary

This glossary defines some of the terms and acronyms used in this document.

TERM

DEFINITION

Authentication

A process where the CMTS verifies that access is authorized, using a

password, trusted IP address, or serial number.

cable modem

A device installed at a subscriber location to provide data

communications over an HFC network. Unless otherwise specified,

all references to “cable modem” in this documentation refer to

DOCSIS cable modems only.

coaxial cable

A type of cable consisting of a center wire surrounded by insulation

and a grounded shield of braided (coax) wire. The shield minimizes

electrical and radio frequency interference. Coaxial cable has high

bandwidth and can support transmission over long distances.

DHCP

Dynamic Host Configuration Protocol server — dynamically assigns

IP addresses to client hosts on an IP network. DHCP eliminates

manually assigning static IP addresses by “leasing” an IP address

and subnet mask to each client. It enables the automatic reuse of

unused IP addresses.

The SBG901 is simultaneously a DHCP client and a DHCP server.

A DHCP server at the cable system headend assigns a public IP

address to the SBG901 and optionally to clients on the SBG901 LAN.

The SBG901 contains a built-in DHCP server that assigns private IP

addresses to clients.

DMZ

A “de-militarized zone” is one or more hosts logically located

between a private LAN and the Internet. A DMZ prevents direct

access by outside users to private data. (The term comes from the

geographic buffers located between some conflicting countries, such

as North and South Korea.) In a typical small DMZ configuration, the

DMZ host receives requests from private LAN users to access

external web sites and initiates sessions for these requests. The

DMZ host cannot initiate a session back to the private LAN. Internet

users outside the private LAN can access only the DMZ host. You

can use a DMZ to set up a web server or for gaming without

exposing confidential data.

downstream

In a cable data network, this is the direction of the data received by

the computer from the Internet.

firewall

A security software system on the SBG901 that enforces an access

control policy between the Internet and the SBG901 LAN.

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TERM

DEFINITION

gateway

A device that enables communication between networks using

different protocols. The SBG901 enables up to 245 computers

supporting IEEE 802.11b/g or Ethernet to share a single broadband

Internet connection.

ISP

Internet Service Provider

MAC address

The Media Access Control address is a unique, 48-bit value

permanently saved in ROM at the factory to identify each Ethernet

network device. It is expressed as a sequence of 12 hexadecimal

digits printed on a label on the bottom of the SBG901. You need to

provide the HFC MAC address to the Internet Service provider. Also

called an Ethernet address, physical address, hardware address, or

NIC address.

NAT

Network Address Translation is an Internet standard for a LAN to use

one set of IP addresses for internal traffic and a second set of IP

addresses for external traffic.

pass-through

A pass-through client on the SBG901 LAN obtains its public IP

address from the Internet Service provider’s DHCP server.

port mirroring

A feature that enables one port (source) on the SBG901 to be copied

to another port (destination) to be studied. The destination mirrors

the transmitted (from) or received (to) data on the source port to

enable the person managing the network to monitor activity.

port triggering

A mechanism that allows incoming communication with specified

applications. Primarily used for gaming applications.

private IP

An IP address assigned to a computer on the SBG901 LAN by the

DHCP server on the SBG901 for an address-specified lease time.

Private IP addresses are used by the SBG901 LAN only; they are

invisible to devices on the Internet. See also public IP address.

public IP address

The IP address assigned to the SBG901 by the Internet Service

provider. A public IP address is visible to devices on the Internet. See

also private IP address.

QoS

Quality of service describes the priority, delay, throughput, and

bandwidth of a connection.

RJ-11

The most common type of connector for household or office phones.

RJ-45

An 8-pin modular connector; this is the most common connector

type for 10Base-T or 100Base-T Ethernet networks.

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TERM

DEFINITION

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 via the 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.

subscriber

A home or office user who accesses television, data, or other

services from an Internet Service provider.

synchronous

The SBG901 uses synchronous timing for upstream data

transmissions. The CMTS broadcasts timing messages that

bandwidth is available. The SBG901 reserves data bytes requiring x

number of mini-slots. The CMTS replies that it can receive data at a

specified time (synchronized). At the specified time, the SBG901

transmits the x-number of data bytes.

upstream

In a cable data network, upstream describes the direction of data

sent from the subscriber’s computer through the cable modem to

the CMTS and the Internet.

Wireless Cable Modem

Gateway

The Motorola SURFboard Wireless Cable Modem Gateway is a

single device that combines a cable modem, router, Ethernet switch,

wireless access point, and DHCP server for SOHO or SME use.

WPA

Wi-Fi Protected Access (WPA) encryption, as described on the Wi-Fi

Alliance web page: http://www.wifialliance.org. It is a far more robust

form of encryption than WEP. Motorola recommends using WPA if

all of your client hardware supports WPA.

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Software License

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C

Software License

SURFboard SBG901 Wireless Cable Modem Gateway

Motorola, Inc.

Home & Networks Mobility Solutions Business (“Motorola”)

101 Tournament Drive

Horsham, PA

19044

IMPORTANT

: PLEASE READ THIS SOFTWARE LICENSE (“LICENSE”) CAREFULLY BEFORE YOU INSTALL, DOWNLOAD

OR USE ANY APPLICATION SOFTWARE, USB DRIVER SOFTWARE, FIRMWARE AND RELATED DOCUMENTATION

(“SOFTWARE”) PROVIDED WITH MOTOROLA’S CABLE DATA PRODUCT (THE “CABLE DATA PRODUCT”). BY USING THE

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TO ANY SUBSEQUENT USER OF THIS SOFTWARE.

IF YOU DO NOT AGREE TO ALL OF THE TERMS OF THIS LICENSE (I) DO NOT INSTALL OR USE THE SOFTWARE AND (II)

RETURN THE CABLE DATA PRODUCT AND THE SOFTWARE (COLLECTIVELY, “PRODUCT”), INCLUDING ALL

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The Software includes associated media, any printed materials, and any “on-line” or electronic documentation.

Software provided by third parties may be subject to separate end-user license agreements from the manufacturers of

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The Software is never sold. Motorola licenses the Software to the original customer and to any subsequent licensee for

personal use only on the terms of this License. Motorola and its 3rd party licensors retain the ownership of the

Software.

You may:

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laws.

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Software License

84

The Product is not designed or intended for use in on-line control of aircraft, air traffic, aircraft navigation or aircraft

communications; or in design, construction, operation or maintenance of any nuclear facility. MOTOROLA AND ITS 3RD

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Government is subject to restrictions as set forth in subdivision (c)(1)(ii) of The Rights in Technical Data and Computer

Software clause at 52.227-7013. The contractor/manufacturer is Motorola, Inc., Home & Networks Mobility Solutions

Business, 101 Tournament Drive, Horsham, PA

19044.