Paradyne 3980-A2-GZ40-20 Features Manual page 15

Originating Modem
SDC enabled with LAPM_Buffer
negotiation.
SDC enabled with LAPM_Discon
negotiation.
SDC enabled with LAPM_Buffer
negotiation.
SDC enabled with LAPM_Discon
negotiation.
SDC disabled.
SDC disabled.
* If during the negotiation phase, the modem with SDC enabled receives data from the remote modem indicating that it
has SDC disabled, the link will not be established between the two modems. For example, the link will not be
established if the remote modem is configured for Async mode with an EC mode of V42/MNPorBfr, V42/MNPorDsc,
LAPM_Buffer, or LAPM_Discon.
** On a leased line, the originating modem sends an endless EC negotiation sequence with the SDC request parameter.
Data cannot be successfully transmitted.
*** On a leased line, the answering modem waits indefinitely for an EC negotiation sequence with an SDC request
parameter. Data cannot be successfully transmitted.
Monitoring SDC Performance
If SDC is enabled, six performance measurements related to SDC can be displayed on the DCP. These
measurements are available in the SDC submenu of the Status branch and are divided into two groups: TX
(transmit) measurements and RX (receive) measurements.
Call_Setup
3980-A2-GZ40-20
Table 5
SDC Negotiation Configuration Scenarios
Answering Modem
SDC enabled.
SDC enabled.
SDC disabled.
SDC disabled.
SDC enabled with LAPM_Buffer negotiation.
SDC enabled with LAPM_Discon negotiation. Disconnect.***
"Status"
Test Configure
Status
VF Identity DTE SDC
TX
November 1996
SDC connection.
SDC connection.
Buffer mode connection.*
Disconnect.**
Buffer mode connection.*
Control Remote Security
Options Record
RX
496-14951
Negotiation Results
15