Innovaphone IP1200, Руководство администратора

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innovaphone gateway Page 81
Appendix H: Glossary
This glossary relates to all innovaphone gateways, including innovaphone DECT
gateways:
A
A-law
The A-law method is a method for the dynamic compression of audio
signals, which is described in the ITU G.711 recommendation. The dynamic
compression improves the signal-to-noise ratio under equivalent
transmission conditions. The method uses a logarithmic dynamic
characteristic curve, which has high dynamics particularly at low input levels
and very low dynamics at high input levels. This reduces the noise at low
input levels, that is, for quiet sounds. The A-law method is used mainly in
Europe; the USA uses a method that differs slightly in the quantisation
levels, the µ-law method. This method is characterised by a dynamic
characteristic curve that, in the low level range, is even steeper than that of
the A-law method.
Alt sync master
An alternative synchronisation source.
ARI
An ARI ( A ccess R ights I dentifier) is a unique identifier for a DECT system.
ARP
The ARP protocol ( A ddress R esolution P rotocol) is a typical ES-IS protocol
( E nd S ystem - I ntermediate S ystem P rotocol) used to covert the MAC
addresses ( M essage A uthentication C ode) to the relevant IP addresses
( I nternet P rotocol) to enable communication on the network layer using the
IP protocol. The ARP protocol creates mapping tables for this purpose,
which assign the MAC addresses to the network addresses.
Auto-MDX
The Auto-MDX function is the automatic detection of an uplink port on an
Ethernet interface. No crossover cables are required with the Auto-MDX
function, since the Ethernet interface can automatically switch the send and