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Patton electronic 2720 User Manual

Page 8

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Switch S1-3: Tx Clock Invert

Switch S1-3 allows the user to invert the transmit clock originating

in the 2720. When S1-2 is set for transmit clock, it may be necessary to
invert the transmit clock to allow for delays due to long cables.

S1-3

Tx Clock Invert

On

Transmit clock is inverted

Off

Transmit clock is normal

Switches S1-4 and S1-5: Line Build Out

Use Switches S1-4 and S1-5 to set the Line Build Out (LBO). The

Line Build Out varies the pulse shape and attenuation of the signal
sent to the network. The amount of Line Build Out depends on
NetLink™ T1’s distance to the last repeater. The telephone company
providing the service will advise on the amount of LBO necessary. In
most cases the default setting will suffice.

SW1-4

SW1-5

Function

Off

Off

(0dB)

On

Off

-7.5dB

Off

On

-15.0dB

On

On

-22.5dB

Switch S1-6 Through S1-8: Reserved

3.2 SOFTWARE CONFIGURATION

The Model 2720 features a menu-driven command system that

allows you to monitor/configure its operating parameters. Follow the
instructions below to configure the Model 2720 using the software
selections:

1)

Plug the 9-pin male end of the cable to your terminal or com-
puter’s DB-9 serial port and start up the terminal emulator
software if necessary. Plug the miniature stereo plug into the
rear of the unit. The small recessed jack on the left side of
the unit is the control port jack.

NOTE: If your terminal uses a DB-25 connector, please use a
DB-9 to DB-25 Adapter to connect to the cable.

2)

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

9600 Baud
8 data bits, 1 stop bit, no parity
Local echo off
ANSI or VT-100 emulation

3) Here is an example of a terminal emulator setup session. In

normal font

are the various parameter types. In

bold type

are

the values that should be used for best results. Your terminal
program’s setup screen may differ from this one:

Baud rate: 9600

Parity: None

Data Length: 8

Stop Bits: 1

Default terminal type:

VT100

Local Echo:

Off

Add Line Feeds after CRs:

Off

Received Backspace Destructive:

On

Backspace key sends:

BS

XON/XOFF software flow control:

On

CTS/RTS hardware flow control:

Off

DSR/DTR hardware flow control:

Off