Patton electronics 1092RC, User Manual

Switch S1-3:  Data Set Ready During Local Line Loopback Test

Use Switch S1-3 to control the behavior of the DSR signal at the

EIA interface during the local line loopback test.

S1-3

Setting

Description

On

Enabled

DSR is on during local 
line loop (default)

Off

Disabled

DSR is off during local 
line loop 

Switches S1-4 and S1-5:  Async/Sync Operation

Use Switches S1-4 and S1-5 to configure the Model 1092 for

async/sync operation. Both switches must be set in the “Off” position.
There is no other valid setting.

S1-4

S1-5

Setting

Off

Off

Allows sync/async control

On

Off

Reserved

Off On

Reserved

On

On

Reserved

Switches S1-6 and S1-7:  Transmit Clock Source 

Use Switches S1-6 and S1-7 to configure the 1092 for internal,
external, or receive recover clock mode.  

S1-6

S1-7

Setting

Description

On

On

Internal

Transmit Clock 
derived internally

Off

On

External

Transmit Clock 
derived from the 
terminal interface

On 

Off

Receive Recover

Transmit clock derived
from the received line
signal

Off

Off

hardware reset

8

Important:  

A pair of Model 1092s communicate synchronously

across the twisted pair line connection.  Therefore, 

you must set

these switches whether your application is async or sync

.

For X.21 or Async applications, please configure one Model 1092
for internal clock mode and the other Model 1092 for receive
recover clock mode.

ER

glows red to indicate the likelihood of a Bit Error 
in the received signal.  During the 511 or 511/E 
test, ER flashes to indicate that the Test Pattern 
Detector has detected a bit error.

TM 

glows red to indicate that the Model 1092RC 
has been placed in Test Mode.  The unit can be 
placed in test mode by  the local user or by the 
remote user.

NS

(No Signal) glows red to indicate that the local 
Model 1092RC has not yet connected with the 
remote Model 1092RC.

5.2  TEST MODES

The Model 1092RC offers two proprietary loopback test modes,

plus a built-in V.52 BER test pattern generator, to evaluate the condition
of the modems and the communication link.  These tests can be
activated physically from the front panel, or via the interface.  

5.2.1  Using Local Line Loopback (LLB)

The Local Line Loopback (LLB) test checks the operation of the

local Model 1092RC, and is performed separately on each unit.  Any
data sent to the local Model 1092RC in this test mode will be echoed
(returned) back to the user device (see Figure 11, below).  For
example, characters typed on the keyboard of a terminal will appear on
the terminal screen.

To perform an LLB test, follow these steps:

1.

Activate LLB.  This may be done in one of two ways:  First, by 
moving the front panel toggle switch to the right to “Local”.  
Second, by raising the LLB signal on the interface (see 
Appendix C).  Once LLB is activated, the Model 1092RC 
transmitter output is connected to its own receiver.  The “TM” 
LED should be lit. 

29

1090

Figure 11

Local Line Loopback

1092RC