US Robotics COURIER - Page 93

COURIER HIGH SPEED MODEMS
Link Timeouts: Protocol detection problems: communications
were severed momentarily, and the modems probably
recovered. This does not indicate the retry timeout.
Link Naks: Negative acknowledgments (one or more blocks).
Data Compression: Indicates the type of data compression
negotiated for the call (V 42BIS or MNPS) or NONE. A V 42BIS
response includes the size of the dictionary and the maximum
string length used, for example, 2048/32. See Appendix A for
more information.
Equalization Long/Short: Status of S15 bit O; long if bit 0=0,
short if bit 0= 1. Short equalization applies only to HST modems.
Fallback: Enabled/Disabled: indicates whether or not the
modems negotiated online fallback during the connection
sequence.
Protocol: Indicates the error control protocol negotiated (LAPM,
MNP, NONE) or SYNC for a synchronous call.
Speed: The last rates at which the receiver I transmitter were
operating before disconnecting.
Disconnect Reason: Possible reasons the modem hung up are as
follows:
DTR dropped: The DTE dropped the Data Terminal Ready
signal, terminating the call.
Escape code: The operator sent the modem the +++ escape
code.
Loss of carrier: The modem detected loss of the remote
modem's carrier and waited the duration specified in Register
SlO (default is 0.7 seconds).
Inactivity timeout: The modem detected no activity on the
line for the duration specified in Register Sl 9 (default is 0,
timer disabled).
MNP incompatibility: The modem is set to &MS and the
remote modem does not have MNP capability, or there was
an MNP negotiation procedure error.
Retransmit limit: The modems reached the maximum of
twelve attempts to transfer a data frame without error.
8-4 Queries and Help Screens
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