Patton electronic 2500 Series DTE Loop Control, Clock Mode, Anti-Stream Timer, CTS Delay

DTE Loop Control

The local loop and remote loop can be activated from the DTE interface using signals “LL” and “RL”.

SW2-4

On Enable LL and RL inputs

Off Disable

Clock Mode

The appropriate transmitter clocking modes can be selected for Dedicated DDS, Switched-56 or campus-area (private) operation.

SW2-5 SW2-6		Mode	Description
On	Off	External Clock Mode	Transmit Clock derived
			from terminal interface
Off	Off	Network Clock Mode	Transmit clock derived
		(Looped Clock Mode)	from the received line
			signal; Use this mode
			for Dedicated DDS
			operation
On	On	Internal Clock Mode	Transmit Clock derived
			internally
Off	On	Switched 56	(Model 2510, 2520)

Anti-Stream Timer

The anti-stream timer protects multidrop networks from a drop that is continuously transmitting. If the terminal keeps RTS raised for more than 30 seconds, the timer forces RTS off internally. This allows the rest of the multidrop network to resume operation. The CSU/DSU remains in the forced-off condition until the terminal drops RTS.

		Timer Value in Sec at Various Line Rates
SW2-7	Timer	56	19.2	9.6	4.8	2.4
On	Disabled
Off	Enabled	2	4	8	15	30

CTS Delay

The RTS/CTS turn-on delay can be set to Normal or Extended.

		Delay in mSec at Various Line Rates
SW2-8	CTS Delay	56	19.2	9.6	4.8	2.4
Off	Normal	0.3	0.9	1.9	3.8	7.5
On	Extended	1.3	3.8	7.5	15	30

4.2 CONFIGURATION USING SOFTWARE SWITCHES

The Model 2500 Series CSU/DSUs can be soft configured using a VT100 terminal or similar RS-232 DTE with terminal emulation. To use software switches for configuration, follow these steps:

1)Connect the serial RS-232C port of the terminal to the modular EIA-561 control port on the front panel of the Model 2500 Series. To construct an RS-232 to EIA-561 patch cable, refer to the control

port pinout diagram in Appendix D.

2) Power up the terminal and set its RS-232C port as follows:

9600 baud

8 data bits, 1 stop bit, no parity local echo

CR = CR/LF on inbound data ANSI, VT-100 emulation

3)Key menu, then press [RETURN]. The Model 2500 Series Main Menu should then display on the terminal screen (see below).

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