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Configuration
5-7
BAUD RATE
The baud rate of a channel is determined by the baud rate of the equipment connected to the chan-
nel. With the cursor positioned at BAUD RATE, you begin the selection by pressing the Return
key; the standard MEGAMUX PLUS channel rates and SPECIAL RATES selections appear be-
low the channel parameters display.
To select a standard rate, use the cursor position keys to position the cursor at the required rate.
Press the Return key to complete the selection. The selected rate appears in the parameter display
under BAUD RATE, and the REMAINING BANDWIDTH display is revised.
Special rates are non-standard baud rates that are programmed into particular systems upon cus-
tomer request. Special rates are only available if your system has been programmed to include
them. To select the special rate display, use the cursor position keys to place the cursor over the
SPECIAL RATES selection. Press the Carriage Return key. The special rates provided for your
system are displayed. You then use the cursor position arrows and the Return key to select a spe-
cial baud rate, in the same procedure used for selecting a standard rate. (If your system has no
special rates, selecting SPECIAL RATES will have no effect.)
In software version X.10, an error is displayed when an attempt is made to configure an ASP
channel card for a data rate it does not support. The current card supports four ASP data rates of
10 kbps, 11 kbps, 12 kbps, and 16 kbps. Earlier versions of the ASP channel card supported only
one rate, 16K.
Baud rates are fixed for PCM, UVC/PCM, ADPCM and fixed rate ASP Voice channels.
The Universal Voice Card/ADPCM (UVC/ADPCM) operates in several modes. The data rate
field of the circuit configuration display contains the selection for each operating mode, as fol-
lows.
16.0K
24.0K
32.0K
A32K
NA32K
CC32K
The following defines each of the UVC /ADPCM operating; modes.
16.0K
This 16 kbps mode uses a proprietary GDC algorithm to provide quality voice transmission at a
lower data rate. This mode may not be used to transmit modem analog signals.
24.0K
T h is 24 k bp s m o de u ses a p rop rietary G D C algo rith m to prov id e hig h q uality v oice tran sm ission s at a
low er d ata rate. M od em analog sign als of 24 00 b ps or less m ay also be tran sm itted in this m o de.
32.0K
This 32 kbps mode uses a proprietary GDC algorithm for ADPCM encoding. It is intended for
modem applications where a modem analog signal is transmitted through the network using the
ADPCM voice channel. Modems may operate at 4800 bps or less using this mode. This operating
mode provides improved signal-to-noise performance over the other 32 kbps operating modes
(when used in modem applications). Do not select this mode for voice applications.
A32K
This 32 kbps mode complies with the draft version of the ANSI ADPCM standard dated March
1985. This mode should only be used if a specific application requires adherence to the draft
ANSI standard.
036R660-000, Issue 10
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