Cabletron Systems CSMIM-T1 manual Result, Dcd

Chapter 7: AT Commands and Registers

NOTES

Hardware flow control overrides &C and \D settings for CTS. (See \Q.)

The modem ignores &C and \ D settings while connected in V.23 half-duplex direct mode (%F3).When \D4 is set, &D should be set to a value greater than 0.

ITU-T recommends that DSR come On when establishing a connection and drop when the connection ends. It is also recommended that CTS follow DTR while in command state; drop either when answer tone is detected when originating, when going off hook when answering, or when connection ends; and follow connection status during connection.

		Table 7-1 The &C and \D Settings
&C	\D	Result
0	0	DCD On, DSR On, CTS On
0	1	DCD On, DSR On, CTS On
0	2	DCD On, DSR On, CTS On
0	3	DCD On, DSR complies with the ITU-T recommendations, CTS
		On
0	4	DCD On, CTS/DSR comply with the ITU-T recommendations
1	0	DCD follows modem carrier, DSR On, CTS On
1	1	DCD follows modem carrier, DSR follows off hook, CTS follows
		DCD
1	2	DCD follows modem carrier, DSR and CTS both follow DCD set-
		ting
1	3	DCD follows modem carrier, DSR complies with the ITU-T recom-
		mendations, CTS On
1	4	DCD follows modem carrier, CTS/DSR comply with the ITU-T
		recommendations

7-12 CSMIM-T1 Hardware Installation Guide