Switch SET SW2 | Patton electronic 2500 Series specification

Character Length

In asynchronous data format, 10 and 11 bit characters are supported. This setting is ignored in synchronous data format.

	Character		Character Description
SW1-6	Length	Start	Data bits	Parity	Stop bits
Off	10-bit	1	8	None	1 or more
		1	7	1	1 or more
		1	7	None	2
On	11-bit	1	8	1	1 or more
		1	9	None	1 or more

Data Format

The data format selection controls whether an async-to-sync conversion is performed. (Data is always transferred synchronously between the two CSU/DSU’s)

SW1-7	Data Format
On	Asynchronous
Off	Synchronous

Note1: The async rate of 57.6 kbps is supported at the 56kbps line rate, provided the DTE equipment transmits two stop bits. Two stop bits can be configured on most DTE equipment. This extra stop bit reduces the DTE’s effective data rate by a few percent to allow synchronization with the 56kbps line speed.

Note2: Lower speed asynchronous data can be transmitted on synchronous circuits by simple over-sampling. To do this, leave Data Format set to synchronous. Make sure the CSU/DSU’s sync data rate is at least 4 times more than the async data rate you wish to send.

DSR Loop Status

The behavior of the DSR output during performance of a local loop can be controlled.

	DSR
SW1-8	Loop Status	Description
On	DSR On	DSR remains high (On) during the
		Analog Loop
Off	DSR Off	DSR goes low (Off) during the
		Analog Loop

4.1.2 SWITCH SET SW2

The configuration switches on switch SW2 control the Rate

Adapter/DTE Rate, Clock Mode, Anti-Stream Timer and RTS/CTS Delay. Figure 5 (below) summarizes SW2 switch settings, including the factory defaults. Following Figure 4 is a description of each switch setting.

	SWITCH SET 2 SUMMARY TABLE
Position	Function	Factory Default
Switch SW2-1	Rate Adapter/	Off	}DTE Rate
Switch SW2-2	DTE Rate	Off	}DTE Rate
Switch SW2-3		Off
Switch SW2-4	DTE Loop Control	Off	Disabled
Switch SW2-5	Clock Mode	Off		Network	Off Model 2510
Switch SW2-6		Off	}	Clock	On }	Switched 56
Switch SW2-6		Off	}		On }
Switch SW2-7	Anti-Stream Timer	On Disabled
Switch SW2-8	RTS/CTS Delay	Off Normal

Figure 4. Summary of switch settings, showing factory defaults

Rate Adapter/DTE Rate

The Model 2500 Series includes a rate adapter that allows the unit to be used with DTE devices that support rates lower than 56/64 kbps. All switch settings below are valid for line rates of 56 or 64 kbps.

SW2-1	SW2-2	SW2-3	DTE Rate
On	On	On	2.4 kbps
Off	On	On	4.8 kbps
On	Off	On	9.6 kbps
Off	Off	On	19.2 kbps
On	On	Off	38.4 kbps
Off	Off	Off	Line Rate = DTE Rate

Note: for DTE devices that operate at 57.6 kbps, set the Line Rate to 56 kbps (see Section 4.1.1), set the rate adapter for “Line Rate=DTE Rate”, and configure your DTE device for two stop bits (set character length accordingly).

Patton electronic 2500 Series user manual Switch SET SW2, Switch SET 2 Summary Table