Technical Terms & Definitions

D.O.D. Wipe
DOD wiping is a standard that the Department of Defense created to
ensure data on their hard drives was unrecoverable. The process
involves storing random data over top of the contents of the entire
hard drive. The more this is done, the less recoverable the sensitive
information is. DOD 5220.22-M (the US DoD security manual) requires
that the drive be overwritten three times, but more is better.
DSL (Digital Subscriber Line)
Common Usage: Customers (typically individuals
or small businesses) who simply want to use
their existing phone lines for Internet connectivity.
Must be within 18,000 feet of a central office.  

Definition: A high-speed Internet connection
delivering data over existing telephone lines at a
transmission speed between 128Kbps-10Mbps.

DS1 (Digital Signal Level 1)
Common Usage:
Customers (typically small to medium businesses) that need
a high-speed Internet connection, multiple phone lines, or
a combination of the two.  

Definition: A service that provides a dedicated
connection from your premises to a long distance switch,
providing the user with a multi-channel, high-capacity digital
circuit for voice and/or data applications. DS1 can be
provisioned by channels for data, voice, or any combination
up to 24 channels.

T1 (Trunk Level 1)
Common Usage:
Customers (typically small to medium businesses) requiring
high-speed Internet connections, point-to-point data transport
customers, and multi-line voice capability.  

Definition: A digital transmission link with a
total speed of up to 1.544 Mbps. Mostly synonymous with DS1.
A T1 Internet connection’s cost
is comprised of two parts: the local loop charge or the
phone circuit that connects your location to the Internet
point-of-presence (POP), and the actual Internet bandwidth
access port charge.

ISDN
Common Usage: Businesses that need Internet connections
beyond 18,000 feet from a central office.  

Definition: A one- or two-channel digital connection.
Each channel can transmit at 64 Kbps, and can be used for data
or voice capability.

T3 (Trunk Level 3)
Common Usage: Customers (typically medium to large businesses)
needing high-speed Internet, point-to-point data transport, and/or
multi-line voice capability.  

Definition: Is synonymous with a DS3 (Digital Signal Level 3).
A T3 transmits at a rate of 43.232 Mbps and consists of 28 T1 circuits.

OC3 (Optical Character Level 3)
Common Usage: Larger business that need high-speed Internet
connections, point-to-point data transport customers, and multi-line
voice customers.  

Definition: Transmits at a rate of 155 Mbps, and is equivalent
to 84 T1 circuits. An OC3 is termed a “fiber connection.”

OC12
Common Usage: Larger business that need high-speed Internet
connections, point-to-point data transport customers, and multi-line
voice customers.  

Definition:Transmits at a rate of 622 Mbps, and is equivalent
to 4 OC3 circuits.

OC48
Common Usage: Larger business that need high-speed Internet
connections, point-to-point data transport customers, and multi-line
voice customers.  

Definition: Transmits at a rate of 2.5 Gbps, and is equivalent
to 4 OC12 circuits.

OC192
Common Usage: Phone companies, large Internet Service Providers
(ISPs), and large companies offering streaming media services (video,
music, Internet teleconferencing, etc.). Other customers may acquire
an OC192, but most will never fully utilize it.  

Definition: Transmits at a rate of 9.6 Gbps, and is equivalent
to 4 OC48 circuits.

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