Paradyne COMSPHERE 3920PLUS Technical Reference Manual page 145

COMSPHERE 392xPlus Modems
V.42/MNP/Buffer Configuration Options — Singleport Mode A
Send Break Cntl: Data_First
End Data_First Break_First
This configuration option only appears when Async/Sync Mode is configured for Async, and Error Control
Mode is not configured for DirectMode.
Send Break Control. Determines what is sent from the modem first, data or break if a break sequence is sent from the
DTE.
Data First (Nonexpedited) – A break is treated as a data character and is sent in the order it was received. This is also
known as Nonexpedited mode.
Break First (Expedited) – A break is sent before the data currently in the buffer. This is also known as Expedited mode.
NOTE: This configuration option is ignored if the Break Forces Escape configuration option (refer to the DTE Dialer
configuration options group) is enabled.
The AT commands for Break First are \K0, \K1, \K2, and \K3.
The AT commands for Data First are \K4 and \K5.
Sync Comp Mode: DirectMode
Nxt DirectMode HDLC/SDLC
This configuration option only appears if Async/Sync Mode is configured for Sync.
Synchronous Compression Mode. Determines the modem's type of synchronous data compression.
DirectMode – Disables the Synchronous Data Compression mode.
HDLC/SDLC – Enables the Synchronous Data Compression mode.
NOTE: The modem resets when Sync Comp Mode is set to DirectMode.
The AT command for DirectMode is #SC0.
The AT command for HDLC/SDLC is #SC1.
SDC Negotiation: LAPM_Discon
Nxt LAPM_Buffer LAPM_Discon
This configuration option only appears when the Async/Sync Mode configuration option is set is to Sync and
Sync Comp Mode configuration option is not set to DirectMode.
Synchronous Data Compression Negotiation. Determines the type of negotiation used when the modem attempts to
connect using SDC.
LAPM_Buffer – The modem attempts to establish an SDC connection. If the remote modem has SDC capability, then
the connection is established with SDC active. If the remote synchronous modem does not have SDC capability, then
the local connection is made in Buffer mode. Do not set both ends of a leased line to LAPM_Buffer.
LAPM_Discon – The modem attempts to establish an SDC connection. If the remote modem has SDC capability, then
the connection is established with SDC active. If the remote modem does not have SDC capability, then no connection
occurs and the modem generates a disconnect.
NOTE: For further information on SDC Negotiation, refer to
Appendix H, Synchronous Data Compression.
The AT command is S-Register S35 = n, where n is 0 for LAPM_Buffer and 1 for LAPM_Discon.
5-68
Table 5-12
(5 of 8)
Table H-1, SDC Negotiation Configuration Scenarios, in
October 1998 3920-A2-GH30-40