Ambit U10C034, Руководство пользователя

Страница: 10 / 90

U10C034 Telephony Version v1.4 June 2008
x
iLBC
internet Low Bitrate Codec. The codec is designed for narrowband
speech and operates either with 30ms or 20ms frame sizes. The bit rate
is 13.3 kbit/s for 30 ms frames (400 bits per block) or 15.2 kbit/s for 20
ms frames (304 bits per block). The iLBC codec enables graceful
speech quality degradation in the case of lost frames, which occurs in
connection with lost or delayed IP packets.
MIB
Management Information Base. The data representing the state of a
managed object in an SNMP-based network management system.
MTA
Multimedia Terminal Adapter. A subscriber premises device that
contains the network interface, CODECs, and all signaling and
encapsulation functions required for telephony support, CLASS
features signaling, and QoS signaling. The MTA is an integral part of
U10C034 Telephony embedded MTA (eMTA) products.
NCS
Network Call Signaling. The PacketCable protocol used to control
calls.
PacketCable
A CableLabs-led initiative aimed at developing interoperable interface
specifications for delivering advanced, real-time multimedia services
over two-way cable plant.
PHS
Payload Header Suppression. A technology used to describe the process
of suppressing the repetitive portion of payload headers at sender and
restoring the headers at the receiver.
QoS
Quality of Service. An attribute of a Service Flow, defining limitations
or guarantees for data rate, latency, and jitter.
Quarantine
A state where an endpoint (phone line) may potentially buffer events.
Events not quarantined are processed normally. Processing of
quarantined events may be delayed, potentially indefinitely.
REN
Ringer Equivalency Number. It is a somewhat arbitrary number which
denotes the loading a telephone ringer has on the line