Eicon Networks 1530 manual SET Hdlc Mode Active Passive Normal Extended

SET HDLC N1 NumBytes

Defines the maximum frame size. This parameter can generally be determined by adding 16 to the Maximum Packet Size, or adding 5 if the Maximum Packet Size is great than 256. However, if your Maximum Packet Size is less than 256, and you are using the Fast Select feature, then find the size, in bytes, of the following parameters and add them together: Direct Header (1), HDLC Packet Header (2, or 3 for extended sequence), X.25 Packet Header (3, or 4 for extended sequence), DTE Address Length (1), DTE Address (0 to 15), Facility Length (1), Facilities (0-63), User Data (0-16), Fast Select Client Data (0-128). If the exact value cannot be calculated, this parameter can be set to a higher value than needed. For example, if set to 261, it will accommodate any packet size up to 256 bytes.

Connections using the X.25 protocol use the HDLC protocol at a lower level. As a result, the valid ranges and default values may vary as follows:

HDLC only: Range: 1-8194. Default: 1504.

X.25 over HDLC: Range: (X.25 Max Packet Size + 5 or 16) - 1029. Default: 261.

SET HDLC N2 MaxRetryCount

Defines the Maximum Retry Count, which is the limit to the number of retries made when a particular frame meets with repeated negative acknowledgments from the remote device.

Range: 1-99. Default: 10.

SET HDLC K MaxWindowSize

Defines the Maximum Window Size, which is the number of frames that are to be sent before the Eicon 1530 waits for an acknowledgment from the remote device. In certain situations, you may wish to define a large window size (with satellite networks that have significant transmission delays, for example). The maximum window size can never be exceeded, and it must match on both sides of the link.

Range: 1-7, or 1-127 if Extended Sequence Mode is enabled.

Default: 7.

Extended Sequence Mode is defined with SET HDLC MODE.

SET HDLC MODE { ACTIVE PASSIVE } { NORMAL EXTENDED }

Defines how the HDLC Link setup procedure is handled. Applies only if a DTE port has been configured. Default: Active Normal.

ACTIVE: The Eicon 1530 will initiate the setup procedure. This option is generally used with DTE addressing.

PASSIVE: The Eicon 1530 will wait for the remote device to initiate the setup procedure.

NORMAL: Sets the Maximum Window Size range to 1-7 (for most networks).

EXTENDED: Sets the Maximum Window Size to 1-127 (for networks supporting the Extended Sequence Mode.

Maximum Window Size is defined with SET HDLC K.

Command Line Interface 130