Paradyne COMSPHERE 3920Plus Technical Reference Manual page 88

COMSPHERE 392xPlus Modems
MSD Port Control: Host
Nxt Host Modem
This configuration option does not appear when MSD is disabled.
Modem Sharing Device Port Control.
Host – The host computer determines the polling sequence that controls which port transmits at any given time. When
the DTE/DCE equipment attached to a port raises RTS (Request-to-Send) it gets to use the channel. If more than one
port raises RTS at the same time, the transmission on the channel is garbled. The system protocol ensures that only
one port transmits data at a time.
Modem – The modem determines the polling sequence that controls which port transmits at a given time. The first port
to raise RTS will receive CTS (Clear-to-Send) authorization to transmit data. When the current transmitting port lowers
its RTS, the modem randomly polls another port with RTS raised.
NOTE: The Port Rate Sub Group configuration options are not available in Digital Bridge mode.
Modem MSD: Disable
Nxt/End Disable Enable
This configuration option only appears when NetworkPosition is configured for Tributary.
Modem Modem Sharing Device. Disables or enables the MSD function on a per-port basis.
NOTE: When the Modem MSD configuration option is enabled, port rates default to the lowest port number. For example,
if Modem MSD is enabled for Ports 2, 3, and 4, only Port 2 rates are available.
NOTE: When using TMp modulation on a tributary modem, port rates are not available when the Modem MSD configuration
option is disabled.
Rate at 33.6 K
Nxt Disable 33600 28800 24000 19200 16800 14400 12000 9600 7200 4800 2400 1200
Rate at 33.6K. When the modem rate is 33,600 bps the port rate will be as selected by this configuration option (Disable
or 33600 to 1200). The total for all ports cannot exceed the modem rate of 33,600 bps.
Rate at 28.8 K
Nxt Disable 28800 24000 19200 16800 14400 12000 9600 7200 4800 2400 1200
Rate at 28.8K. When the modem rate is 28,800 bps the port rate will be as selected by this configuration option
(Disable, 28800, or 1200). The total for all ports cannot exceed the modem rate of 28,800 bps.
Rate at 24.0 K
Nxt Disable 24000 19200 16800 14400 12000 9600 7200 4800 2400 1200
Rate at 24.0K. When the modem rate is 28,800 bps the port rate will be as selected by this configuration option
(Disable, 24000, or 1200). The total for all ports cannot exceed the modem rate of 24,000 bps.
Rate at 19.2 K
Nxt Disable 19200 16800 14400 12000 9600 7200 4800 2400 1200
Rate at 19.2K. When the modem rate is 19,200 bps the port rate will be as selected by this configuration option (Disable
or 19200 to 1200). The total for all ports cannot exceed the modem rate of 19,200 bps.
Rate at 16.8 K
Nxt Disable 16800 14400 12000 9600 7200 4800 2400 1200
Rate at 16.8K. When the modem rate is 16,800 bps the port rate will be as selected by this configuration option (Disable
or 16800 to 1200). The total for all ports cannot exceed the modem rate of 16,800 bps.
5-12
DTE Interface Configuration Options — Multiport Mode l
Port Rate Sub-Group (One for Each Port)
Table 5-1
(3 of 9)
October 1998 3920-A2-GH30-40