Black Box 5000 manual Port Contention/Queueing, Call Completion Receiving port

Multiserver 5000

or

Initiated by Multiserver (or remote end):

1.Calling device disconnects.

2.Multiserver drops CTS, DSR, and CD.

3.Port is marked out-of-service until device acknowledges disconnect by dropping then raising DTR.

AUTO (ANSWER) PROTOCOL

Call Request (Calling port attached to a dialup modem)

Idle State: Ring (Busy at the Multiserver) is low. Other control signal levels are ignored. Multiserver holds CTS, DSR, and CD off.

1.Device sends ring/no-ring cycle (RI 1 second on, 2 seconds low).

2.Multiserver raises DSR (DTR at modem) and CTS (RTS at modem) when RI goes low.

3.Modem raises DSR (DTR at Multiserver) and CTS (RTS at Multiserver) within 60 seconds.

4.If ABR is enabled, <cr> should now be typed (see Section 9.3, Asychronous Channels).

Call Completion (Receiving port)

1.Multiserver sends ring cycles (RI 2 seconds on, 4 seconds off).

2.Device must raise DTR within 2 ring cycles or it will be made inoperable until it does.

3.Multiserver has 2 seconds to raise DSR and CTS.

Disconnect Sequence

Initiated by device:

1.Device drops DTR.

2.Multiserver drops DSR and CTS. Initiated by Multiserver (or remote end):

1.Multiserver drops DSR and CTS.

2.If Call Inhibit is on, the channel will be marked out-of-service until device drops DTR.

10.10Port Contention/Queueing

Port contention allows multiple users access to a limited number of resources.

If no resource is idle, the user will be placed in queue for the busy ports in the primary or secondary class.

Once in the queue, the user may receive the current queue message (Waiting Q = your place in the queue) by typing in any printable ASCII character or a <cr>. The user may also exit the queue (and return to the resource prompt) by pressing the <break> key.

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