IBM SC30-3681-08 Group Poll, Frame Size, Timers, XID/TEST resp, Snrm response, Poll response

Con®guring SDLC Interfaces

Group Poll

Address used for the group poll feature for multipoint link con®gurations. Secondary stations having group inclusion coded as yes will respond to unnumbered polls received from this address. This address must be non-null for the group poll feature to be in effect for any secondary stations under this link. Each secondary station will still have a unique station address in addition to the group address.

Cable Speci®es the type of cable in use (RS-232, V.35, V.36, or X.21).

Encoding

Con®gures the SDLC transmission encoding scheme as NRZ (Non-Return to Zero) or NRZI (Non-Return to Zero Inverted).

Clocking

Interface clocking, EXTERNAL or INTERNAL.

Frame Size

The maximum frame size that can be sent over the interface.

Timers:

All the timers listed below have a 100ms resolution.

XID/TEST resp.

The time to wait for an XID or TEST response message before retransmitting the XID or TEST frame. A value of 0 indicates that the router will continue to retry inde®nitely.

SNRM response

The maximum time to wait for an UA response message before the station retransmits SNRM(E).

Poll response

The maximum time to wait for a response from any polled station before retrying.

Inter-poll delay

The amount of time the router (con®gured with a primary role) waits after receiving a response, before polling the next station.

RTS hold delay

The amount of time that the primary router waits before dropping RTS low after the transmission of a frame. The RTS hold delay parameter is speci®c to half-duplex operation.

Interframe delay

The number of ¯ags sent between frames.

Inactivity timeout

For idle NRM/E secondary stations, sets the time after which the interface changes the station to its recovery state. A 0 (zero) causes the station to remain idle inde®nitely.

Counters:

XID/TEST retry

The maximum number of times the router sends an XID or TEST frame without receiving a response before timing out. A value of 0 indicates that the router will retry inde®nitely.

Chapter 38. Con®guring and Monitoring SDLC Interfaces 543