Specifications

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Cisco 1751 Router Software Configuration Guide
OL-1070-01
GLOSSARY
A
ACOM
Term used in G.165, "General Characteristics of International Telephone Connections and International
Telephone Circuits: Echo Cancellers." ACOM is the combined loss achieved by the echo canceller,
which is the sum of the Echo Return Loss, Echo Return Loss Enhancement, and nonlinear processing
loss for the call.
ADPCM
Adaptive differential pulse code modulation. Process by which analog voice samples are encoded into
high-quality digital signals.
API
Application programming interface. Specification of function-call conventions that defines an interface
to a service.
B
BECN
Backward explicit congestion notification. Bit set by a Frame Relay network in frames travelling in the
opposite direction of frames encountering a congested path.
C
Call leg
Segment of a call path. A logical connection between a telephone and a router, a router and a network,
a router and a PBX, or a router and the PSTN using a session protocol. Each call leg corresponds to a
dial peer.
CIR
Committed information rate. The average rate of information transfer a subscriber (for example, the
network administrator) has stipulated for a Frame Relay PVC.
CODEC
Coder-decoder. Device that typically uses pulse code modulation to transform analog signals into a
digital bit stream, and digital signals back into analog. In VoIP, it specifies the voice coder rate of
speech for a dial peer.
D
Dial peer
Software object that ties together a voice port and a local telephone number (local dial peer or POTS
dial peer) or an IP address and a remote telephone number (remote dial peer or VoIP dial peer). Each
dial peer corresponds to a call leg.
DLCI
Data-link connection identifier. Value that specifies a PVC or SVC in a Frame Relay network.