ADTRAN 1200212L1, Руководство пользователя

Страница: 77 / 172

Chapter 6. DTE Port Configuration
61200212L1-1 DSU IQ User Manual 6-3
PHYSICAL LAYER OPTIONS (PHYS LYR OPT)
Interface Type (INTERFACE)
Select the connector type for the DTE interface. The choices are
V.35 and EIA-232 . See Pinouts on page A-1 for the connector pin
assignments.
Bit Rate
Set the operating speed of the DTE interface to 56 or 64 kbps.
Flow Control
This option determines how the DSU IQ responds to congestion
during DBU operation.
None
No flow control is used and the DSU IQ drops frames during
severe congestion while in DBU operation.
Hardware
The DSU IQ 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.