ADTRAN TSU IQ+, 1204002L2 user manual Port MAP, NX Port, Physical Layer Options Phys LYR Opts

Chapter 6. Data Port Configuration

PORT MAP

The PORT MAP designates which DS0s are assigned to which port. For example, to pass the channel’s data to a PBX, map the channel to the DSX-1port. To pass data to another device (such as a router), map the channel to the NX port. Set all unassigned channels to

IDLE.

NX PORT

Configure the PHYSICAL LAYER and FRAME RELAY options for the V.35 Nx56/64 port. Descriptions of the available selections follow.

Physical Layer Options (PHYS LYR OPTS)

Flow Control

This option determines how the TSU IQ+ responds to congestion during DBU operation.

None

No flow control is used and the TSU IQ+ drops frames during severe congestion while in DBU operation.

Hardware

The TSU 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.

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.

6-2 TSU IQ+ User Manual 61200275L1-1