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61200214L1-1 IQ Probe User Manual 45
Chapter 6. DTE Port Configuration
None
No flow control is used and the IQ Probe drops frames during
severe congestion while in DBU operation.
Hardware
The IQ Probe varies the DTE TC clock as necessary to relieve
congestion during DBU operation.
FECN/BECN
While in a congested state during DBU operation, frames across
the DBU PVCs have FECN or BECN set depending on the
direction. Frames outbound to the network have FECN set,
while frames inbound to the attached DTE device have BECN
set. This method is useful if the attached DTE devices can
respond to congestion notification.
CTS Option
Set the CTS lead to FORCED ON or FOLLOW RTS.
Forced On
The CTS lead is always on and the RTS lead is ignored.
Follow RTS
The CTS lead is on when the RTS lead is on (and off when the
RTS lead is off).
DSR Option
Set the DSR lead to FORCED ON or NORMAL.
Forced On
The DSR lead is always on.
Normal
The DSR lead is off when the IQ Probe does not receive DSR
from the DSU/CSU on the DCE port.
CD Option
Set the CD lead to FORCED ON or NORMAL.