IBM SC30-3681-08 manual Clocking internal or external, Idle ¯ag, Idle mark

Con®guring and Monitoring SDLC Relay

		A DTE cable is used when you are attaching the router to some type of
		DCE device (for example, a modem or a DSU/CSU).
		A DCE cable is used when the router is acting as the DCE and providing
		the clocking for direct attachment.
clocking internal or external
		Con®gures the SRLY link's clocking. To connect to a modem or DSU,
		con®gure clocking as external. To connect directly to another DTE device,
		use a DCE cable, set the clocking to internal, and con®gure the clock
		speed. For internal clocking, you must enter a valid line speed in the range
		2400 - 2048000 bits per second.
		Example:
			set clocking internal
encoding nrz or nrzi
		Con®gures the SRLY interface's encoding scheme as NRZ (Non-Return to
		Zero) or NRZI (Non-Return to Zero Inverted). NRZ is the default.
		Example:
			set encoding nrz
frame-size
		Con®gures the maximum size of the frames that can be transmitted and
		received on the data link. If this value is set to a larger value than that
		speci®ed with the add remote-secondary command, then this value is
		changed to re¯ect that maximum. The IBM 2210 generates an ELS
		message warning the user that this value is changing. The user will
		continue receiving this ELS message until it is changed in the SRAM
		con®guration. Valid entries are shown in Table 67.
		Note: The frame size must be large enough to accommodate the largest
			frame received plus a 15±byte SRLY header.
	Table 67. Valid Values for Frame Size in Set Frame-Size Command
	Minimum			Maximum	Default
	128			18000	2048
idle ¯ag
		Con®gures the transmit idle state for framing on the SRLY interface. The
		default is the ¯ag option which provides continuous ¯ags (7E hex) between
		frames.
		The link will receive a ¯ag idle transparently.
idle mark
		Con®gures the transmit idle state for framing on the SRLY interface. The
		mark option puts the line in a marking state (OFF, 1) between frames.
		The link will receive a mark idle transparently.
speed		For internal clocking, this command speci®es the speed of the transmit and
		receive clock lines. The range of speeds supported is 2400 - 2048000 bits
		per second. If you want to use a line speed greater than 2048000, you can
		only do this on:
		v	interface 1.
		v port 1 of a 4-port WAN concentration adapter.
		v ports 1 and 5 of an 8-port WAN concentration adapter.

Chapter 36. Con®guring SDLC Relay 531