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Cisco网络术语字典
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Cisco官方出版的网络术语字典。包括了几乎所有网络术语的权威解释,看书时有不懂的地方多来查查看。
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Book Title
78-xxxxx-xx
Preface
Internetworking continues to be one of the fastest developing high-technology fields today. Businesses
and individuals have come to depend on the Internet for completing a wide range of their daily operations
and activities.
It is no secret that Cisco Systems has capitalized on the Internet’s potential, doing many of their business
operations and functions across the Web, including over 85% of their annual sales transactions across
the Internet.
For these reasons, the World Wide Web and the field of internetworking continue to grow at accelerated
speeds. Cisco Systems, which provides the backbone for more than 60% of the world’s networking
systems, has created this Cisco Press internetworking reference in order to provude professionals both
inside and outside the field of networking with definitions and meanings for the terms and acronyms used
in the area of internetworking.
Many terms are included that relate to specific networking technology areas such as telephony,
broadband, and wireless communications.Because comprehensive glossaries exist for these technologies
elsewhere, and because includeing every term for all related technologies would prove unrealistic and
burdensome, only those terms which are in some way related to networking are included here.
Additionally, because Cisco continues to lead the network industry by developing and releasing new
products in areas of networking year after year, this book contains a section of Cisco-related terms for
Cisco-specific and Cisco-product-specific terms.
We at Cisco Press, hope you find this reference useful, whether you are a student or professional working
in the field of internetworking, or someone who uses the Internet in his or her daily operations at work
or home. Because of the dynamic pace at which this field is developing, we realize that some of the
information in this book may have changed by press time. For this reason, we have included a feedback
card, which we hope you will use to provide us with information for future editions. Additionally, the
feedback card contains online addresses so that you can contact us via the Internet. Please do so—we
look forward to hearing from you.
E-mail your comments to:
ciscopress@cisco.com
(DRAFT LABEL) ALPHA DRAFT - CISCO CONFIDENTIAL
ii
Book Title
78-xxxxx-xx
Preface
1
Dictionary of Internetworking Terms and Acronyms
1-58720-045-7
Numerics
1+1
A method of protecting traffic in which a protection channel exists for each working
traffic channel. For optical systems, the protection channel fibers can be routed over
a path separate from the working fibers. The traffic signal is bridged to both the
working and protection transmitters so the protection signal can be selected quickly
if the working channel fails.
1:n
A method of protecting traffic in which one protection channel exists for n traffic
channels. Only one traffic channel can be switched to the protection channel at any
given time.
1G mobile network
First generation mobile network. Refers to the initial category of mobile wireless
networks that use analog technology only. Advanced Mobile Phone Service (AMPS)
is an example of a 1G mobile network standard.
10Base2
10-Mbps baseband Ethernet specification using 50-ohm thin coaxial cable. 10Base2,
which is part of the IEEE 802.3 specification, has a distance limit of 606.8 feet
(185 meters) per segment. See also Cheapernet, EtherChannel, IEEE 802.3, and
Thinnet.
10Base5
10-Mbps baseband Ethernet specification using standard (thick) 50-ohm baseband
coaxial cable. 10Base5, which is part of the IEEE 802.3 baseband physical layer
specification, has a distance limit of 1640 feet (500 meters) per segment. See also
EtherChannel and IEEE 802.3.
10BaseF
10-Mbps baseband Ethernet specification that refers to the 10BaseFB, 10BaseFL, and
10BaseFP standards for Ethernet over fiber-optic cabling. See also 10BaseFB,
10BaseFL, 10BaseFP, and EtherChannel.
10BaseFB
10-Mbps baseband Ethernet specification using fiber-optic cabling. 10BaseFB is part
of the IEEE 10BaseF specification. It is not used to connect user stations, but instead
provides a synchronous signaling backbone that allows additional segments and
repeaters to be connected to the network. 10BaseFB segments can be up to 1.24 miles
(2000 meters) long. See also 10BaseF and EtherChannel.
10BaseFL
10-Mbps baseband Ethernet specification using fiber-optic cabling. 10BaseFL is part
of the IEEE 10BaseF specification and, although able to interoperate with FOIRL, is
designed to replace the FOIRL specification. 10BaseFL segments can be up to 3280
feet (1000 meters) long if used with FOIRL, and up to 1.24 miles (2000 meters) if
10BaseFL is used exclusively. See also 10BaseF, EtherChannel, and FOIRL.
10BaseFP
Numerics
2
Dictionary of Internetworking Terms and Acronyms
1-58720-045-7
10-Mbps fiber-passive baseband Ethernet specification using fiber-optic cabling.
10BaseFP is part of the IEEE 10BaseF specification. It organizes a number of
computers into a star topology without the use of repeaters. 10BaseFP segments can
be up to 1640 feet (500 meters) long. See also 10BaseF and EtherChannel.
10BaseT
10-Mbps baseband Ethernet specification using two pairs of twisted-pair cabling
(Categories 3, 4, or 5): one pair for transmitting data and the other for receiving data.
10BaseT, which is part of the IEEE 802.3 specification, has a distance limit of
approximately 328 feet (100 meters) per segment. See also EtherChannel and IEEE
802.3.
10Broad36
10-Mbps broadband Ethernet specification using broadband coaxial cable.
10Broad36, which is part of the IEEE 802.3 specification, has a distance limit of 2.24
miles (3600 meters) per segment. See also EtherChannel and IEEE 802.3.
100BaseFX
A 100-Mbps baseband Fast Ethernet specification using two strands of multimode
fiber-optic cable per link. To guarantee proper signal timing, a 100BaseFX link
cannot exceed 1312 feet (400 meters) in length. Based on the IEEE 802.3 standard.
See also 100BaseX, Fast Ethernet, and IEEE 802.3.
100BaseT
100-Mbps baseband Fast Ethernet specification using UTP wiring. Like the 10BaseT
technology on which it is based, 100BaseT sends link pulses over the network
segment when no traffic is present. However, these link pulses contain more
information than those used in 10BaseT. Based on the IEEE 802.3 standard. See also
10BaseT, Fast Ethernet, and IEEE 802.3.
100BaseT4
100-Mbps baseband Fast Ethernet specification using four pairs of Categories 3, 4, or
5 UTP wiring. To guarantee the proper signal timing, a 100BaseT4 segment cannot
exceed 328 feet (100 meters) in length. Based on the IEEE 802.3 standard. See also
Fast Ethernet and IEEE 802.3.
100BaseTX
100-Mbps baseband Fast Ethernet specification using two pairs of either UTP or STP
wiring. The first pair of wires receives data; the second transmits data. To guarantee
the proper signal timing, a 100BaseTX segment cannot exceed 328 feet (100 meters)
in length. Based on the IEEE 802.3 standard. See also 100BaseX, Fast Ethernet, and
IEEE 802.3.
100BaseX
100-Mbps baseband Fast Ethernet specification that refers to the 100BaseFX and
100BaseTX standards for Fast Ethernet over fiber-optic cabling. Based on the
IEEE 802.3 standard. See also 100BaseFX, 100BaseTX, Fast Ethernet, and IEEE
802.3.
100VG-AnyLAN
100-Mbps Fast Ethernet and Token Ring media technology using four pairs of
Categories 3, 4, or 5 UTP cabling. This high-speed transport technology, developed
by Hewlett-Packard, can operate on existing 10BaseT Ethernet networks. Based on
the IEEE 802.12 standard. See also IEEE 802.12.
1000Base-F
A 1-Gbps IEEE standard for Ethernet LANs.
2B1Q
Numerics
3
Dictionary of Internetworking Terms and Acronyms
1-58720-045-7
2 binary 1 quaternary. An encoding scheme that provides a 2 bits per baud, 80-kbaud
per second, 160-kbps transfer rate. The most common signaling method on ISDN U
interfaces. The 1988 ANSI spec T1.601 defines this protocol in detail.
2G mobile network
second generation mobile network. Refers generically to a category of mobile
wireless networks and services that implement digital technology. GSM is an
example of a 2G mobile network standard.
2G+ mobile network
second generation plus mobile network. Refers generically to a category of mobile
wireless networks that support higher data rates than 2G mobile networks. GPRS is
an example of a 2G+ mobile network standard.
24th channel signaling
See 2G mobile network.
3G mobile network
third generation mobile network. Refers generically to a category of next-generation
mobile networks, such as UMTS and IMT-2000.
370 block mux channel
See block multiplexer channel.
4B/5B local fiber
4-byte/5-byte local fiber. Fiber channel physical media used for FDDI and ATM.
Supports speeds up to 100 Mbps over multimode fiber. See also TAXI 4B/5B.
6BONE
The Internet’s experimental IPv6 network.
8B/10B local fiber
8-byte/10-byte local fiber. Fiber channel physical media that supports speeds up to
149.76 Mbps over multimode fiber.
802.x
A set of IEEE standards for the definition of LAN protocols.
822
The short form of RFC 822. Refers to the format of Internet-style e-mail as defined
in RFC 822.
1822
A historic term that refers to the original ARPANET host-to-IMP interface. The
specifications are in BBN report 1822. See also host and IMP.
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