User manual

55 000 026 – Ed. B SCOOP E-Z - User Manual 33
This document is the property of AETA and can not be duplicated without authorisation November 2001
b) When the speed function is set on "Fixed" at ONE of the both Scoop E-Z unit, the 2
modems will be allowed to negotiate at only the lowest speed of the two max
speeds selected.
They will neither "fall forward" nor "fall back".
If this select speed is too high for the possibility of one of the local network
capacity, the modem will "NOT CONNECT" and a lower has to be selected by the
user to obtain a solid connection at a reliable data rate.
Rem : By setting Speed fixed, the user has the ability to select the max/min connect rate
for the modems before a call is placed. So the fall back to a lower speed cannot
occur during the communication.
9.3.2. Clock Mode
For long distance transmission, it is better to set on free this parameter. The reason is
: in this mode, each modem generates the transmit clock and generate receive clock
from receive carrier signal. In this case, each way is separated.
In standard mode, each modem works with only one clock. The local Scoop E-Z
generate the clock and the remote generate its clock from receive carrier signal.
9.3.3. Line level
The phone line level depending of country where you are. You can adjust the phone
line level between 0dBm to –16dBm. The most popular level is –10dBm ( default value
).
9.4. Error protection
This function reduces the short and occasional transmission errors causing glitches and
drop-out in the audio. Those errors can be founded particularly on long distance circuits
and when connected to an in-house phone systems.
The audio quality could be slightly affected.
The user will only hear a short additional delay.