Visara LINCS Central Control - Manual (Page 112)

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LINCS Central Control
707024-002
The following special PF keys are used to “down” a circuit:
• PF3 Down DSC Force the downstream circuit down
• PF4 Down USC Force the upstream circuit down
• PF5 REQDISC Send a request disconnect to the host
Note that downing a circuit will not keep it down. Most downstream devices will try to re-
establish within 30 seconds or less. Additionally, this function downs the circuit but makes
NO attempt to bring it back up.
Current Status of Gateway Circuits
Options for Current Status of the Gateway Circuit are:
• Link Down - No link activity. The link is in Normal disconnect or Disconnected mode.
• Sending SNRMs - SNRMs are currently being sent to this PU address.
• Sending SABME - SABMEs are currently being sent to this PU address.
• Link Up - Link is up and in normal response mode. Data will flow when available.
• Local Busy - The local side of the link is temporarily out of communication buffers.
• Remote Busy - The remote side of the link is temporarily out of communication buffers.
• CONNECT Received - A CONNECT/CONTACT has been received, but a positive
response has not been received from the DSN.
• PU Active - The PU is currently active. Data will flow when available.
• Flowed Off - The local side of the link is temporarily out of communication buffers.
• Remote Flow - The remote side of the link is temporarily out of communication buffers.
• TCP Window - The TCP window has closed on the local side of the link.
• Remote Window - The TCP window has closed on the remote side of the link.
• Circ Idle - No TCP connection has been made between partners.
• TCP_Half - One of the two TCP connections has been made between the partners.
• Disconnected - Both TCP connections have been made between the partners.
• Resolve Pend - The local link is processing the CANUREACH from the remote link.
• Circ Pending - The local link is waiting for the REACH_ACK command from the remote
link.
• Circ Estab - The SSP circuit is established.
• Conn Pending - The local link is waiting for a CONTACTED response to a
CONTACT command.
• Cont Pending - The local link is waiting for the downstream side of a gateway circuit to
establish a connection.
• Connected - The SNA circuit has been established.
• Disc Pend - The local link is waiting for a DL_HALTED in response to a
HALT_DL command.
• Halt Pend - The local link is waiting for its SNA circuit to be taken down.
• Restart Pend - The local link is waiting for its SNA circuit to be taken down and
subsequent restart.
• Circ Restart - The local link is waiting for its SNA circuit to be restarted.