The format of the LOOP command is:

   LOOP target [loop-options]

Target types are:

   EXECUTOR
   LINE
   NODE

The loop options are:

   COUNT
   LENGTH
   WITH

For more help use:

   HELP LOOP loop-option
   HELP LOOP target-type
2 COUNT
Use the COUNT option to specify the number of messages to be looped.  The
format is:

   COUNT number

Where number is a decimal integer in the range 1-65535.

If the COUNT option is not used, the default count is 1.
2 EXECUTOR
Use the LOOP EXECUTOR command to loop test using a logical link within the
executor node.  The format is:

   LOOP EXECUTOR [access-control] [loop-options]

Where access-control is any access control necessary to gain access to the
executor loopback mirror, and loop-options is zero or more of COUNT, LENGTH
and/or WITH.

For more help use:

   HELP ACCESS CONTROL
   HELP LOOP loop-option
   HELP EXECUTOR
2 WITH
Use the WITH option to specify the type of data in the messages to be looped.
The format is:

   WITH block-type

Where block-type is one of:

   MIXED    to use blocks of alternating binary ones and zeroes.
   ONES     to use blocks of binary ones.
   ZEROES   to use blocks of binary zeroes.

If the WITH option is not used, the default is MIXED.
2 LENGTH
Use the LENGTH option to specify the number of bytes of test data in the
messages to be looped.  The format is:

   LENGTH number

Where number is a decimal integer in the range 1-65535.

If the LENGTH option is not used, the default length is 128.

Note that if the length selected is too long for the message handling modules,
the user will be informed as to the maximum allowable length.
2 LINE
Use the LOOP LINE command to loop test a specific line.  The format is:

   LOOP LINE line-id [loop-options]

Where line-id is the identification of the executor's line that is to be loop
tested and loop-options is zero or more of COUNT, LENGTH and/or WITH.

The line must be in either the ON or SERVICE state.  If it is in the ON state
it will be temporarily made unavailable to its owner and used for the loop
test.  If it is in the SERVICE state it is reserved for such operations as
loop and the owner is already not using it.

For more help use:

   HELP LINE
   HELP LOOP loop-option
2 NODE
Use the LOOP NODE command to loop test to a specific node using a logical link.
The format is:

   LOOP NODE node-id [access-control] [loop-options]

Where node-id is the identification of the node that is to be connected to
for the loop test, access-control is any access control necessary to gain
access to the node's loopback mirror, and loop-options is zero or more of
COUNT, LENGTH and/or WITH.

The node can be either a normal node or a loop node.

For more help use:

   HELP ACCESS CONTROL
   HELP LOOP loop-option
   HELP NODE
   HELP SET NODE LINE
2 WITH
Use the WITH option to specify the type of data in the messages to be looped.
The format is:

   WITH data-type

Where data type is one of:

   MIXED  - for data composed of alternating binary zeroes and ones.
   ONES   - for data composed of all binary ones.
   ZEROES - for data composed of all binary zeroes.

If the WITH option is not used, the default data type is MIXED.