3Com Nbx 100 And Ss3 Nbx Administration Guide
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Configuring Option 184461 6After you have entered all elements in the new value, click OK. You return to the Predefined Options and Values dialog box. The values that you entered appear in the Val u e area of the dialog box under Byte. The values appear in hexadecimal format although you entered them in decimal format. 7To accept the values, click OK. You return to the DHCP Microsoft Management Console dialog box. Activating Option 184To activate option 184, decide whether you want to apply the option to a specific scope or globally, to all scopes that are served by the DHCP server software. To activate option 184 for a specific scope: 1In the left pane of the DHCP Microsoft Management Console dialog box, locate the scope that you want. Then highlight Scope Options. 2Right click Scope Options, and, from the menu that appears, select Configure Options. The Scope Options dialog box appears. 3Scroll down in the Available Options list until you find the option that you just added (184 NBX in this example). 4Enable the check box to the left of the option. 5Click OK. In the right pane, the option name appears in the Option Name column. The Vendor column contains the word Standard. The values of the individual elements that you entered appear in the Va lu e column. The values appear in hexadecimal format although you entered them in decimal format. This is not a problem. 4The length of the argument that applies to this suboption. For option 184, suboption 1, the argument is an IP address, which is composed of four numerical fields (octets). NOTE: The next four fields use 10.234.1.254 as the example IP address of the NBX Call Processor. Enter the IP address of your NBX Call Processor instead. 10The first octet in the IP address of the NBX Call Processor. 234The second octet in the IP address of the NBX Call Processor. 1The third octet in the IP address of the NBX Call Processor. 254The fourth octet in the IP address of the NBX Call Processor. What you typeDescription
462APPENDIX C: CONFIGURING OPTION 184 ON A WINDOWS 2000 DHCP SERVER To activate option 184 globally: 1In the left pane of the DHCP Microsoft Management Console dialog box, highlight Server Options. 2Right click Server Options, and from the menu that appears, select Configure Options. The Server Options dialog box appears. 3Scroll down in the Available Options list until you find the option that you just added (184 NBX in this example). 4Enable the check box to the left of the option. 5Click OK. In the right pane, the option name appears in the Option Name column. The Vendor column contains the word Standard. The values of the individual elements that you entered appear in the Va lu e column. The values appear in hexadecimal format although you entered them in decimal format.
GLOSSARY 10BASE-TA form of Ethernet and IEEE 802.3 network cabling using twisted pair. It provides 10Mbits/s with a maximum segment length of 100 m (382 ft). 10BASE2An implementation of IEEE 802.3 Ethernet standard, often called thinnet or cheapernet, because it uses thin coaxial cable. 10BASE2 runs at a data transfer rate of 10 Mbits/s with a maximum segment length of 185 m (607 ft) per segment. 911The emergency service that provides a single point of contact for police and fire departments. See also E911 . account codesCodes that allow you to keep track of calls associated with a client or account for bookkeeping or billing purposes. ADSLAsymmetrical Digital Subscriber Line. A telephone line that delivers high-speed data services, such as Internet access, videoconferencing, interactive TV, and video on demand. The line is split asymmetrically so that more bandwidth can be used from the telephone company to the customer (downstream) than from the customer to the telco (upstream). AT MAsynchronous Transfer Mode. A cell-based data transfer technique in which channel demand determines packet allocation. ATM offers fast packet technology, real-time, demand-led switching for efficient use of network resources. Attendant ConsoleThe Attendant Console is a standard telephony device that shows the status of each extension in a telephone system. The Attendant Console is usually used by a receptionist to connect incoming calls to the correct extension. All incoming calls ring at the Attendant Console. AUIAttachment Unit Interface. The IEEE 802.3-specified cable and connector used to attach single-channel and multiple-channel equipment to an Ethernet transceiver. Defined in Section 7 of the 802.3 standard.
464GLOSSARY auto dialA feature that opens a line and dials a preprogrammed telephone number. Auto AttendantA system feature that provides incoming callers with menu options to help them reach the appropriate person or information. Auto DiscoveryA feature that “discovers” a new telephone or other device on the network. A new telephone receives a default telephone number that appears on the telephone display panel. A new device is assigned one or more extension numbers or device numbers. auto redialA modem, fax, or telephone feature that redials a busy number a fixed number of times before giving up. autorelocationA feature that allows a telephone to keep its extension number and personal and systems settings when you connect it to a different Ethernet jack on the same LAN. backboneA high-capacity network that links together other networks of lower capacity. A typical example is a Frame Relay or ATM backbone that serves a number of Ethernet LAN segments. bandwidthThe capacity of a connection method to carry data. BRIBasic Rate Interface. An ISDN standard that allows two circuit-switched B (bearer) channels of 64 Kbit/s each plus one D (data) channel at 16 Kbit/s for a total of 144 Kbit/s to be carried over a single twisted pair cable. bridgeA networking device that connects two separate local area networks and makes the LANs look like a single LAN, passing data between the networks and filtering local traffic. bridged extensionAn extension of a primary telephone that appears on one or more secondary telephones. Incoming calls and indeed any activity associated with the primary telephone can be handled on any of the secondary telephones. broadcastA simultaneous transmission method that sends each packet from one node to all other nodes. bufferA temporary storage area for data that compensates for a difference in transmission speeds.
GLOSSARY465 bus topologyA type of network in which all devices are connected to a single cable. All devices that are attached to a bus network have equal access to it, and they can all detect all of the messages that are put on to the network. byteA unit of 8 bits that forms a unit of data. Usually each byte stores one character. call coverage pointThe user-specified destination for the call forward feature, that is, how the system is to handle incoming calls when the user is unable to answer the telephone. caller IDA telephone company service that displays the name and number associated with an incoming call. Also called calling line ID or CLI. See also CLIR . call forwardA feature that allows calls to be transferred to a call coverage point (voice mail, the Auto Attendant, or a prespecified telephone number) when the user is unable to answer the telephone. calling groupsA feature that transfers incoming calls to a specified group of telephones. All telephones ring at the same time. See also hunt groups . call parkA feature that places a call in a “holding pattern” and makes it available for others to pick up from any telephone on the system. call permissionsRestrictions that an administrator establishes to control the types of calls that users can place from their telephones. Can be based on time of day. call pickupA feature that allows users to retrieve calls that ring on other telephones. call reportsA feature that downloads data about calls and creates simple reports or exports the data for use in spreadsheets, word processors, or reporting programs. category 3The cable standard for UTP (unshielded twisted pair) voice-grade cabling that is specified by EIA/TIA 568 for use at speeds of up to 10Mbit/s, including 10BASE-T Ethernet. category 4The cabling standard specified by EIA/TIA 568 for use at speeds of up to 20Mbit/s, including 16Mbit/s token ring . category 5The cabling standard specified by ElA/TIA 568 for use at speeds of up to 100 Mbit/s including FDDI (TP PMD), 100BASE-T and 100BASE-VG-AnyLan, and potentially ATM at 155Mbit/s.
466GLOSSARY client/server computingThe division of an application into two parts that are linked by a network. A typical example is a database application in which the database and application software reside on a server, and the interface for entering or retrieving information resides on individual workstations (clients). CLISee caller ID . CLIRCalling Line Identity Restriction. A telephone company option that allows the caller to withhold caller identity from the person being called. coaxial cableHigh-capacity networking cable that is formed by an outer braided wire or metal foil shield surrounding a single inner conductor, with plastic insulation between the two conducting layers. “Coax” cable is used for broadband and baseband communications networks. Ethernet employs thin coaxial cable in 10BASE2 and thick cable in 10BASE5. CODEC COmpressor/DECompressor. A hardware circuit or software routine that compresses and decompresses digitized audio, video, or image data. Most codecs include the functions of A/D and D/A conversion as well as compression and decompression. COder/DECoder. A hardware circuit that converts analog audio or video signals into digital code, and vice versa, using techniques such as pulse code modulation and delta modulation. A CODEC is an A/D and D/A converter. collapsed backboneNetwork architecture in which the backplane of a device, such as a hub, performs the function of a network backbone . Example: The backplane routes traffic between desktop nodes and between other hubs serving multiple LANs. collisionThe result of two devices on a shared transmission medium, like Ethernet, transmitting simultaneously. Both devices must retry their transmissions. A delay mechanism used by both senders drastically reduces the chances of another collision. collision detectionEthernet devices detect collisions instantly and attempt to resend. This is the principle on which CSMA/CD (Carrier Sense Multiple Access with Collision Detection) is based and the access control method for Ethernet. concentratorA central chassis into which various modules, such as bridging, supervisory, and 10BASE-T cards are plugged.
GLOSSARY467 congestionThe result of increased network use on a LAN segment. Standard network partitioning practices must be invoked to reduce bottlenecks and maximize throughput speeds on the segment. contentionThe method used to resolve which users gain access to crowded bandwidth. COCentral Office. A telephony term for the telephone company site that houses the PSTN switching equipment. CoSClass of Service. A collection of calling permissions that are assigned to individual users and govern the times and types of calls these users can make. CPECustomer Premises Equipment. Telecommunications equipment, including PBXs and wiring, that is located in a user’s premises. CSUChannel Service Unit. Data transmission equipment to repeat the signal from the carrier and link to CPE. Vendors add value to CSUs by adding performance monitoring and management features. CTIComputer Telephony Integration. A generic name for the technology that connects computers and telephone systems through software applications. data compressionA method of reducing the amount of data to be transmitted by reducing the number of bits needed to represent the information. delayed ringingPrevents a telephone on a shared line from ringing until the incoming call has rung on other telephones a set number of times. delayed ringing patternThe definition for the order in which telephones ring and how many times each telephone rings. demand priority accessA method for supporting time-sensitive applications such as video and multimedia as part of the proposed 100BASE-VG standard offering l00Mbit/s over voice-grade UTP cable. DHCPDynamic Host Configuration Protocol. A method by which devices are assigned temporary, renewable IP addresses by a server when the devices become active on the network. DID/DDIDirect Inward Dial/Direct Dialing Inward. A feature that allows outside calls to reach an internal extension without going to an operator or Automated Attendant.
468GLOSSARY direct mail transferTransfers a caller directly to another user’s voice mail without requiring them to wait through ringing and without interrupting the recipient. domainA group of nodes on a network that form an administrative entity. A domain can also be a number of servers that are grouped and named to simplify network administration and security. DSPDigital Signal Processor. A special-purpose CPU tailored to handle complex mathematical functions. A DSP takes an analog signal and reduces it to numbers so its components can be isolated, sampled, and rearranged more easily than in analog form. DSU/CSUDigital (or Data) Service Unit/Channel Service Unit. A pair of communications devices that connect an in-house line to an external digital circuit (such as T1 and DDS). It is similar to a modem, but connects a digital circuit rather than an analog circuit. DTMFDual Tone Multi-Frequency. A term for push button dialing. The pushed button generates a pair of tones which uniquely identify the button that was pressed. E911Enhanced 911. The addition of two features to the standard 911 service: one is ANI (Automatic Number Identification) to identify the person associated with the calling telephone, and the other is ALI (Automatic Location Identification) to identify the physical location of the calling telephone. encapsulationThe process of sending data encoded in one protocol format across a network operating a different protocol, where it is not possible or desirable to convert between the two protocols. Also known as protocol tunneling. error correctionA technique to restore data integrity in received data that has been corrupted during transmission. Error correction techniques involve sending extra data. The correct form of the data can be reconstructed from the extra information. error detectionA set of techniques that can be used to detect errors in received data. Parity checking techniques include the use of parity bits, checksums or a Cyclic Redundancy Check (CRC). EthernetThe most widely used LAN transmission protocol. Based on a network bus topology, it runs at a maximum 10Mbit/s and can use a wide variety of cable types. The IEEE Ethernet standard is IEEE 802.3 .
GLOSSARY469 Ethernet switchingA technique that brings the advantages of a parallel networking architecture to contention-based Ethernet LANs. Each LAN can be segmented with its own path. When users on different segments exchange data, an Ethernet switch dynamically connects the two separate Ethernet channels without interfering with other network segments. fast EthernetAn evolution of Ethernet that raises the bandwidth to 100 Mbit/s. fast packet switchingA WAN technology for transmitting data, digitized voice, and digitized image information. It uses short, fixed length packets. FDDIFiber Distributed Data Interface. An optical fiber-based token-passing ring LAN technology that carries data at a rate of 100 Mbit/s. FRADFrame Relay Access Device. A wide-area networking device that forwards traffic to and from the endpoint of a the network. frameA structured group of bits sent over a link. A frame can contain control, addressing, error detection, and error correction information. The term is often used synonymously with the term packet . frame relayA packet-switching wide-area technology for interconnecting LANs at high speeds. gatewayA network device that provides a means for network traffic to pass from one topology, protocol, or architecture into a different topology, protocol, or architecture. gigabit EthernetAn Ethernet technology that raises transmission speed to 1 Gbit/s, targeted primarily for use in backbones. glareA condition in telephony where both ends of an available connection are seized at the same time. group mailboxesMailboxes that are not associated with a single telephone but allow a group of users to have joint access to a single mailbox. H.323An ITU standard for the transmission of real-time audio, video, and data communications over packet-switched networks, such as local area networks (LANs) and the Internet. H.323 is the basis for Internet telephony.
470GLOSSARY headerThe control information added to the beginning of a transmitted message. This may consist of packet or block address, destination, message number and routing instructions. hierarchical networkA network with one host at its hub, which is the major processing center, and one or more satellite processing units. hot swapThe ability of a device to have parts removed and replaced without turning off the device and without interrupting the service the device provides. hubThe center of a star topology network or cabling system. A multi-node network topology that has a central multiplexer with many nodes feeding into and through the multiplexer or hub. The nodes do not directly interconnect. hunt groupsInformal “call centers” in which a call rings to one member of the group. If there is not answer, the call rings at the next member’s telephone and so on until a member answers. hybrid modeA PBX operating mode in which some outside lines are grouped together in pools while other lines are assigned directly to buttons on telephones. Users access outside lines by dialing a pool access code. See also key mode. IEEEInstitute of Electrical and Electronic Engineers. A U.S. publishing and standards organization responsible for many LAN standards, such as the 802 series. IEEE 802.2The Data Link standard for use with IEEE 802.3, 802.4 and 802.5 standards. It specifies how a basic data connection should be set up over the cable. IEEE 802.3The Ethernet standard. A physical layer definition that includes specification for cabling plus the method of transmitting data and controlling access to the cable. IETFInternet Engineering Task Force. The standards-setting body for the Internet. Protocols adopted by the IETF define the structure and the operation of the Internet. IMAPInternet Message Access Protocol. A method of accessing electronic messages that are kept on a server. IMAP defines how an e-mail program can access messages that are stored on a remote server.