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British thermal unit
buffer
A temporary storage area, usually in RAM.
C.S.C
Cisco Systems Capital
cage
a piece of hardware into which cards are installed
CEF
Cisco express forwarding
Challenge Handshake Authentication Protocol (CHAP)
Challenge Handshake Authentication Protocol. Security feature supported on lines using PPP encapsulation
that prevents unauthorized access. CHAP does not itself prevent unauthorized access, it merely identifies the
remote end. The router or access server then determines whether that user is allowed access.
Channel Service Unit (CSU)
channel service unit. Digital interface device that connects end−user equipment to the local digital telephone
loop. Often referred to together with DSU, as CSU/DSU.
channelized
Channelized modules are modules that can be broken down into time slots.
chassis
a box that houses main electonic components
Command Line Interface (CLI)
command line interface. Interface that allows the user to interact with the operating system by entering
commands and optional arguments. The UNIX operating system and DOS provide CLIs.
Compressed Serial Link Internet Protocol (CSLIP)
Compressed Serial Link Internet Protocol. Extension of SLIP that, when appropriate, allows just header
information to be sent across a SLIP connection, reducing overhead and increasing packet throughput on SLIP
lines.
CRC
20614 Cisco Installing and Maintaining Routers Part 4: 12000 GSR Series and XS5032 Modules
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