  CONFIGURATION EDITOR
  SERIAL PORT
  ACCESS PORT

# X.25 Port

Clocking

Connecting to NPSI Host

DTE Address

Forwarding Unit

High Two Way Channel

IP Parameters

Link Window Size

Low Two Way Channel

NAU Name

Port Initially Enabled

Receive Packet Size

Receive Window Size

Retry

Sense

Signal Control

Speed

T1 Timer

Transmit Packet Size

Transmit Window Size

Use Calling Address

NAU Name

  This optional field enables you to name the port. This name appears in the first line of all NMS responses and alarms pertaining to the port. NAU names must be unique on the unit.
  Range: Up to eight characters (A-Z, 0-9, @, #, $)

DTE Address

  This is the DTE address this port will use to access the X.25 network. If you intend to use this device as a destination for other devices, you must assign a DTE address.
  Range: 1 -- 15 decimal digits

Clocking

  This parameter defines whether or not the unit provides clocking, or relies on an external source.
  Range: Internal, External, X.21 Internal, or X.21 External

Speed

  This value defines the speed at which the port communicates, providing the unit supplies the clocking. If clocking is supplied by an external device, communications will occur at this configured rate, or at the rate of the clocking device, whichever is slower.
  The speed you select should be dependent upon the attached devices, and cable limitations.
  Range: Any speed available from the list

Port Initially Enabled

  Select (enable) this option if you want the port to be enabled when the unit boots up.
  Range: Enabled or Disabled

Co nnecting to NPSI Host

  Select this option if the port will be connecting to an NPSI host.
  Range: Enabled or Disabled

IP Parameters

  Click on this button to define the port's IP parameters.

Signal Control

  Click on this button to specify the physical settings used to determine a port's status.

Sense

  This option enables you to configure the X.25 access port as a logical DTE or DCE device. This selection must be opposite from the corresponding X.25 network port's configuration.
  A logical DTE device initiates a call to the X.25 network.
  A logical DCE device waits to receive an incoming call from the X.25 network.
  Range: DTE or DCE

Link Window Size

  This value defines the maximum number of concurrent, unacknowledged I frames at the X.25 data link level.
  Range: 1 -- 7 frames

T1 Timer

  This value sets the number of seconds the unit waits before entering a recovery/retry sequence.
  Range: 1 -- 99 seconds

Retry

  This value sets the number of times the unit retransmits an unacknowledged I frame before initiating logical link recovery procedures.
  Range: 1 -- 20 times

Transmit Window Size

  This value defines the number of consecutive data packets to transmit on the X.25 network before requiring an acknowledgement. The value you configure must match the value configured in the X.25 network.
  Range: 1 -- 7 packets

Receive Window Size

  This value defines the number of consecutive data packets the unit can receive before sending an acknowledgement.
  Range: 1 -- 7 packets

Transmit Packet Size

  This value defines the size of the packets transmitted across the X.25 network. This value must match the one configured for the X.25 network.
  Range: 16, 32, 128, 256, 512, or 1024 bytes

Receive Packet Size

  This value defines the size of the packets received from the X.25 network. This value must match the one configured for the X.25 network.
  Range: 16, 32, 128, 256, 512, or 1024 bytes

Low Two Way Channel

  This value defines the X.25 packet lower-bound channel number on the port.
  Range: 1 -- 4095

High Two Way Channel

  This value defines the X.25 packet higher-bound channel number on the port. This number must be greater than the low two way channel number.
  Range: 1 -- 4095

Use Calling Address

  This option determines whether or not the DTE address assigned to the port should be included as a calling address in outgoing call packets.
  Range: Enabled or Disabled

Forwarding Unit

  This option enables you to determine how many packets the unit will hold onto before forwarding them to the downstream device. If packets are small enough to traverse the network without tying it up for a long period of time, then the End Of Message (EOM) option is acceptable.
  If you are experiencing poor performance, the X.25 packets may be too large to send all at once. In this case, you may want to hold onto a certain number of packets before forwarding them. For instance, if you select 3 for this field, the unit will hold onto three packets before forwarding them to the downstream device.
  Note: It is recommended that you set this parameter to EOM unless a customer support representative has told you to change it.
  Range: EOM (end of message), or 1 -- 7 packets