Library /sys$common/syshlp/NCPHELP.HLB  —  LOOP  CIRCUIT
 Use the LOOP CIRCUIT command to test a specified circuit in the
 network.  This command does not apply to X25 circuits.  The
 parameters are optional and can be entered in any order.

 LOOP   CIRCUIT circuit-id   ASSISTANT PHYSICAL ADDRESS address
                             ASSISTANT NODE node-id
                             COUNT number
                             HELP help-type
                             LENGTH number
                             NODE node-id
                             PHYSICAL ADDRESS address
                             WITH
                               MIXED
                               ONES
                               ZEROES

 All underscores found in parameters must be replaced with spaces
 when parameters are used in NCP commands.

1  –  ASSISTANT

1.1  –  PHYSICAL ADDRESS address 

 Applies only to broadcast circuits.  Identifies the physical
 address of the node that will perform the role of loopback
 assistant for third-party loop testing.  This parameter must be
 specified if HELP is included in this command. The address cannot
 be a multicast address.  This parameter can be used instead of
 the ASSISTANT NODE parameter.

1.2  –  NODE node-id 

 Applies only to broadcast circuits.  Identifies the name of the
 node or the address of the node that will perform the role of
 loopback assistant for broadcast third-party loop testing.  This
 parameter can be used instead of the ASSISTANT PHYSICAL ADDRESS
 parameter.

2  –  COUNT number 

 Specifies the number of blocks to be sent during loopback
 testing over the circuit.  The count must be a decimal
 integer in the range of 1 through 65535. If the parameter is
 omitted, only one block is looped.

3  –  HELP help-type 

 Applies only to broadcast circuits.  Indicates the amount of
 assistance to be provided during broadcast loopback testing by
 the assistant node, whose address is specified in the ASSISTANT
 PHYSICAL ADDRESS or node-id as specified in the ASSISTANT NODE
 parameter.  There are three possible values of help-type:

   TRANSMIT   The assistant node relays the request to the
              destination node, which replies directly to the
              executor node.

   RECEIVE    The executor node sends the request directly to the
              destination node, which relays the reply to the
              assistant node for transmission to the executor node.

   FULL       The assistant node relays the request and the reply
              between the executor node and the destination node.

 If HELP is specified, ASSISTANT PHYSICAL ADDRESS or ASSISTANT
 NODE must also be specified.

4  –  LENGTH number 

 Specifies the length (in bytes) of the blocks to be sent
 during loopback testing.  The length must be a decimal
 integer in the range of 1 through 4096.  Note that the
 LENGTH parameter must be less than 50 for the DMC-11 circuit
 operating in either controller loopback mode or cable
 loopback mode (a DMC-11 with an attached loopback cable).
 If the parameter is omitted, a block length of 4096 bytes is used.

5  –  NODE node-id 

 Applies only to broadcast circuits. Identifies the destination node
 to be used for loopback testing of the specified broadcast circuit.
 Can be used instead of the PHYSICAL ADDRESS parameter.

6  –  PHYSICAL ADDRESS address 

 Applies only to broadcast circuits.  Identifies the physical
 address of the destination node to be used for loopback testing of
 the specified broadcast circuit.

7  –  WITH data-type 

 Specifies the type of binary information to be sent during
 testing. Three types of data can be sent:

                 MIXED
                 ONES
                 ZEROS

 If omitted, a combination of ones and zeros (MIXED) is sent.

8  –  Examples 

      NCP>LOOP CIRCUIT DMC-0 COUNT 5 LENGTH 20

          This command initiates a circuit-level loopback test over circuit
          DMC-0.  The software loops five messages, 20 bytes in length with
          mixed binary information.

      NCP>LOOP CIRCUIT UNA-0 NODE 224

          This command initiate an Ethernet circuit-level loopback test
          with a node whose address is 224.  In this example, the NODE
          parameter with a node-id of 224 was used in place of the
          PHYSICAL ADDRESS parameter.
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