1 – link
set [node node-id] ddcmp link link-name ...
Modifies the attributes of a link to a DDCMP communications port.
The modifiable attributes and their data types [in brackets] are:
retransmit timer [integer]
physical line [local-entity-name]
receive buffers [integer]
Refer to attributes for specific command examples, or select
logical_station to view the settable attributes of the ddcmp
link logical_station subentity.
1.1 – physical_line
Default: No name Value: Local entity name
Name of the Physical layer entity that the link operates over. A
value for this characteristic must be set before the link entity
is enabled. You can modify this characteristic only when the
entity is disabled.
set [node node-id] ddcmp link link-name -
physical line local-entity-name
1.2 – receive_buffers
Default: 4 Value: 1-255
Specifies the number of receive buffers reserved for the link.
You can only increase the characteristic value.
set [node node-id] ddcmp link link-name receive buffers integer
Example:
set ddcmp link ddcmp-0 receive buffers 8
1.3 – retransmit_timer
Default: 3000 Value: 1-65535
Maximum time (in milliseconds) to wait between sending a message
and receiving a valid response. If this time expires, the local
station takes error recovery action. On full-duplex point-to-
point links, the timer is started immediately when a message is
sent.
set [node node-id] ddcmp link link-name retransmit timer integer
Example:
set ddcmp link ddcmp-0 retransmit timer 3000
1.4 – logical_station
set [node node-id] ddcmp link link-name -
logical station station-name ...
Modifies the attributes of a ddcmp link logical station entity
which manages a link to a remote station. The modifiable
attributes and their data types [in brackets] are:
address [integer]
babble timer [milliseconds]
holdback timer [milliseconds]
transmit window [integer]
Refer to attributes for specific command examples.
1.4.1 – address
Default: 1 Value: 1-255
Data link address of the remote station or tributary. You can
modify this characteristic only when the entity is disabled.
set [node node-id] ddcmp link link-name -
logical station station-name -
address integer
Example:
set ddcmp link ddcmp-0 logical station ddcmp-0 address 1
1.4.2 – babble_timer
Default: 6000 Value: 1-65535
Specifies the time, in milliseconds, for which a selected
tributary or remote station is allowed to transmit. This
characteristic is not used on full-duplex links.
This characteristic is not supported if the characteristic
protocol of the owning ddcmp link entity is set to tributary.
set [node node-id] ddcmp link link-name -
logical station station-name -
babble timer integer
Example:
set ddcmp link ddcmp-0 logical station ddcmp-0 babble timer 6000
1.4.3 – holdback_timer
Default: 0 Value: 0-13000
Maximum time, in milliseconds, that the local station can delay
acknowledging a received message if there is no data to send.
The value of this characteristic is linked to the retransmit
timer used on the remote station. A suggested value is between
10% and 20% of that timer. However, the actual values you can use
may be limited by the communications product.
The default value indicates that no holdback is used and the
local station must acknowledge immediately.
set [node node-id] ddcmp link link-name -
logical station station-name -
holdback timer integer
Example:
set ddcmp link ddcmp-0 logical station ddcmp-0 -
holdback timer 0
1.4.4 – transmit_window
Default: 1 Value: 1-255
Specifies the maximum number of data messages that the local
station can send without receiving an acknowledgment. This
characteristic applies only when the remote station is a control
station or on a half-duplex, point-to-point link. The value of
this characteristic must be less than or equal to the equivalent
of the maximum transmit characteristic on the control station or
remote station.
set [node node-id] ddcmp link link-name -
logical station station-name -
transmit window integer
Example:
set ddcmp link ddcmp-0 logical station ddcmp-0 -
transmit window 127