Glossary - H

H

Hierarchical Routing

Routing based on a hierarchical addressing system. IP routing algorithms use IP addresses, for example, which contain network numbers, host numbers, and frequently, subnet numbers.

High-Bit Rate Digital Subscriber Line (HDSL)

A transmission technology that transmits over two twisted cable pairs up to a DS1-level signal, using any one of the following line codes: Binary / 1 Quaternary (2B1Q) Carrier-less AM/PM, Discrete Multitone ("DMT"), or Binary / 1 Octel ("3BO").

High-Capacity Link

A two-point digital channel, which provides for simultaneous two-way transmission of serial, bipolar, return-to-zero, isochronous digital signals at a transmission speed of 1.544 megabits per second.

High Capacity Switched Access Transport

Dedicated transport service that sends large volumes of voice and/or data at 1.544 Megabits per second or higher. Also known as High Capacity Service.

High Speed Data (HSD)

Interface normally using V.35 or EIA53 standards.

Verizon High Speed Internet for Business

Verizon High Speed Internet for Business is a modem technology that turns your existing phone line into a three-channel data delivery system. One channel transmits voice and fax services, regardless of whether you are accessing the Internet. The remaining downstream and upstream channels carry information to and from the Internet. There are modems at each end of the phone line. One modem is in your location, while the other is in the telephone company central office. Working together, the modems provide a dedicated connection that avoids the need to dial-up for access.

There are multiple download/upload speed packages available: 1.5M/384K, and 3M/768K. A 7.1M/768K package is also available in selected markets. The actual throughput (download) speeds you experience will vary and be lower than the connection speed after accounting for several factors, including the length and condition of your telephone line, the condition of wiring inside your location, computer configuration, network or Internet congestion and the server and router speeds of Web sites you access. Learn more.

High Speed Serial Interface (HSSI)

Standard for a serial interface at high speeds (64 Kbps and higher up to 52 Mbps) between DTE and DCE equipment over very short distances. Used for a physical connection between a router and a DSU.

Hosted IP Centrex

One of Verizon's VoIP offerings, Hosted IP Centrex is designed for customers that want all the features of a PBX or Key system without the associated capital, lease, or maintenance costs. Complete PBX functionality - a full suite of features and routing intelligence - resides in the Verizon network. Learn more. See also Voice over Internet Protocol (VoIP).

Hot Cut

Near-simultaneous disconnection of a Verizon working loop from a port on one carrier's switch, and the reconnection of that loop to a port on a different carrier's switch, without any significant out-of-service period.

HSSI

See High Speed Serial Interface.

Hub

The point on a network where several circuits are connected; also, a network switching node.

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