Verilink 9000 Series (34-00271) Product Manual - Manual (Page 158)

136 C HAPTER 8: NCR
Drop DTR If DCD Drops
This parameter applies to dial-up applications. When set to Y (yes) DTR performs
an on-to-off transition for 500 milliseconds, then returns to the on state.
When this parameter is set to Y, the Maximum Time to ETX is set to 20 seconds.
When the TXPORT device begins receiving a message, it starts a timer. If this
timer expires before the message is complete the TXPORT device throws away the
received data and continues with the next poll. This prevents a terminal from
streaming data to the unit. Normally, this timer is calculated by using the speed of
the link and the maximum buffer size. Fixing the timer at 20 seconds allows using
a dial modem with a constant speed interface where the user actually connects at
different speeds. The selections are Y (yes) and N (no).
Message Timeout
Message timeout represents the time, in milliseconds, the unit waits for a response
to a message. If this time expires before a response is received the message is
retransmitted. If this occurs four consecutive times, the unit discards the message.
The values for this parameter are in 10-millisecond increments. A value that is not
a factor of 10 rounds down to the nearest 10-millisecond factor.
Example: A value of 505 rounds down to 500 milliseconds.
The selections are 0 to 655350, 500.
Active If DSR/DCD
The DSR/DCD parameter determines what leads must be present for the port to be
active. The physical DTE/DCE setting of the port also effects how these leads are
interpreted as shown in Table 8-2. No polling occurs on the port until the selected
requirement is met.
Table 8-2 Active if DSR/DCD
Setting DTE DTE
B (both) DSR and DCD
must be on. DTR must be on.
S (DSR only) DSR must be on. DTR must be on.
N (none) Neither. Neither.