Xblue Networks X-2020 - Manual (Page 72)

Telephone Programming
72 XBLUE Networks
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2. Codec G7.11 a-law
The a-law algorithm is used in many European telecommunications products. This algorithm also allows communication signals to
be send down long expanses wires with very little distortion but a-law does not have as many different frequency ranges that µ-
law, so the signal decreases faster over a shorter distance.
3. Codec G.726-xx
• G.726 is an Adaptive Differential Pulse-code Modulation (ADPCM) protocol that reduces the amount of bandwidth needed by
over 50 percent, with minimal loss of voice quality. This protocol can be used with both µ-law and a-law devices.
• There are four G.726 protocol or compression rates; G.726-40, G.726-32, G.726-24 and G.726-16. The lower the number, (40,
32, 24, 16) the higher the compression. Thus, the lower the bandwidth requirements. Therefore, G.726-16 has the most com-
pression and G.726-40 has the least.
7. Packet Time
There are two ways to determine when information will be sent between devices. Packet Time and Payload. Packet
time is based on a specific time between transmissions, whereas payload depends on the amount of information,
and not the time.
G.711 µ-law
Select the amount of time, in milliseconds, between data transmissions from 10 and 80.
G.711 a-Law
Select the amount of time, in milliseconds, between data transmissions from 10 to 80.
8. Payload
There are two ways to determine when information will be sent between devices. Packet Time and Payload. Packet
time is based on a specific time between transmissions, whereas payload depends on the amount of information,
and not the time.
Select the size of the payload that will be used when transmitting data between devices on the network. There are
five different protocols that can be used, the default “DTMF Payload” which requires the most amount of
bandwidth, and G.726-xx (xx=40, 32, 24 and 16). The lower the “xx” number, the higher the compression, the less
bandwidth required.