Silicon Laboratories SI2493/57/34/15/04 manual Symbols/second, Symbol Rate Allowable Data Rates

AN93

Table 45. S-Register Descriptions (Continued)

Definition

S Register			Function	Default	Range	Units
(Decimal)				(Decimal)
41	V.34 symbol rate - Symbol rate for V.34 when using			0	0–5	–
	the &T4 and &T5 commands.
	0	– 2400	symbols/second
	1	– 2743	symbols/second
	2	– 2800	symbols/second
	3	– 3000	symbols/second
	4	– 3200	symbols/second
	5	– 3429	symbols/second
	A valid combination of symbol rate (S41) and data rate
	(&G) must be selected.
	Symbol Rate		Allowable Data Rates
	2400		2400 – 21600
	2743		4800 – 26400
	2800		4800 – 26400
	3000		4800 – 28800
	3200		4800 – 31200
	3429		4800 – 33600
42	Blacklisting—The ISOmodem does not dial the same			0 (disabled)	0–1	–
	number more than two times in S44 seconds. An
	attempt to dial a third time within S44 seconds results
	in a BLACKLISTED result code. If the blacklist mem-
	ory is full, any dial to a new number will result in a
	BLACKLIST FULL result code. Numbers are added to
	the blacklist only if the modem connection fails. The
	%B command lists the numbers on the blacklists.
	0	– disabled
	1	– enabled
43	Dial attempts to blacklist.			4	0–4	–
	When blacklisting is enabled with S42, this value con-
	trols the number of dial attempts that result in a num-
	ber being blacklisted.
44	Blacklist Timer			180	0–255	seconds
	Period during which blacklisting is active
50	Minimum on-hook time—Modem remains on-hook for			3	0–255	seconds
	S50 seconds. Any attempt to go off-hook is delayed
	until this timer expires.
51	Number to start checking for an outside PBX line.			1	0–9	–

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