User's Manual

7.4 Example of LLC2 Configuration

The number of LLC2 frame received before the response can be configured. For example, it is supposed that

two information frames are received at the time 0 rather than at the maximum number 3, the responses of

these frames are not sent. If the third frame that makes the router response is not received within 800 ms, the

response will be transmitted as the time-delay timer is activated.

interface interface e1/1

llc2 ack-max 3

llc2 ack-delay-time 800

In this connection, as it is told that all the frames are received, the counter that calculates the maximum number

of information frame is reset as 0.

7.4.1 Configuring SDLC as Two-Way and Concurrent Mode

SDLC two-way and concurrent mode allows master SDLC link station to use a full duplex serial circuit. When

an outstanding polling occurs, the master SDLC link station is able to send the data to the slave station. The

two-way and concurrent mode works only on the side of SDLC master station. In the slave link station, it

response to the polling sent from the master station.

SDLC two-way and concurrent mode runs in the multi-branch link environment or point-to-point link

environment.

In the multi-branch link environment, a two-way and concurrent master station is able to poll a slave station

and receive the data from the slave station and send the data (information frame) to other slave stations.

In the point-to-point link environment, so long as no maximum limit on reaching the window, a two-way and

concurrent master station is able to send the data (information frame) to the slave station even if there is an

outstanding polling.

Any one of the commands can be used under interface configuration mode for activating the two-way and

concurrent mode:

Command Purpose

sdlc simultaneous full-datamode

Setting the send of data from master station to the

polled slave station and receive of data from it.

sdlc simultaneous half-datamode

Shutting down the master station sending the data to

the slave station.

7.4.2 Configuring SDLC Timer and Re-Sending Times

When SDLC workstation sends frame, it will wait for the response of receive end. The response indicates the

frame has been received. The response time allowed by the router before re-sending frame can be amended.

The times of re-sending the frame by the software can be set before terminating SDLC session process.

Through controlling these values, by controlling these values, the network overhead can be reduced in

continuing to detect the transmitted frame.

One or two commands below can be used under interface configuration mode for configuring SDLC timer and

retransmission times:

Command Purpose