Specifications

Tune Half-Duplex Timers
Configuring Serial Interfaces IC-115
Place a Low-Speed Serial Interface in Controlled-Carrier Mode
To place a low-speed serial interface in controlled-carrier mode, use the following command in
interface configuration mode:
Place a Low-Speed Serial Interface in Constant-Carrier Mode
To return a low-speed serial interface to constant-carrier mode from controlled-carrier mode, use the
following command in interface configuration mode:
Tune Half-Duplex Timers
To tune half-duplex timers, use the following command in interface configuration mode:
The timer tuning commands permit you to adjust the timing of the half-duplex state machines to suit
the particular needs of their half-duplex installation.
Note that the half-duplex timer command and its options deprecates the following two timer tuning
commands that are available only on high-speed serial interfaces:
• sdlc cts-delay
• sdlc rts-timeout
Change between Synchronous and Asynchronous Modes
To specify the mode of a low-speed serial interface as either synchronous or asynchronous, use the
following command in interface configuration mode:
This command applies only to low-speed serial interfaces available on Cisco 2520 through
Cisco 2523 routers.
Command Purpose
half-duplex controlled-carrier Place a low-speed serial interface in controlled-carrier
mode.
Command Purpose
no half-duplex controlled-carrier Place a low-speed serial interface in constant-carrier
mode.
Command Purpose
half-duplex timer {cts-delay value |
cts-drop-timeout value | dcd-drop-delay value |
dcd-txstart-delay value | rts-drop-delay value |
rts-timeout value | transmit-delay value}
Tune half-duplex timers.
Command Purpose
physical-layer {sync | async} Specify the mode of a low-speed interface as either
synchronous or asynchronous.