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ER - blinks ON/OFF after a 511/511E test has timed
out. See Section 5.2.3 (Test Pattern Generator) for
more information.
- flashes once to indicate that a CRC error has
occurred (during normal operation) or bit errors
have occurred (during 511/511E test).
- Only at power up, blinks once every 200 ms if
the DTE Rate is set to an unsupported setting.
TM glows yellow to indicate that the Model 1095RC
has been placed in Test Mode. The unit can be
placed in test mode by the local user or by the
remote user. The TM LED will flash for 400msec
when a valid packet is received from the Model
1001MC.
NS (No Signal) glows red to indicate that the local
Model 1095RC is not connected with the remote
Model 1095RC. The TM LED will flash for
400msec when a valid packet is received from the
1001MC
5.2 TEST MODES
The Model 1095RC 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 acti-
vated physically from the front panel or via the interface.
5.2.1 Overview
Figure 12 below shows the major elements used in the loop-back
and pattern tests available in the Model 1095. Each block has several
functions. Following Figure 13 are descriptions that show how the ele-
ments are used during Test Modes.
Figure 13: Block Diagram Model 1095
24
55..00 OOPPEERRAATTIIOONN
Once the Model 1095RC is properly configured and installed, it
should operate transparently. These sections describes functions of
the LED status indicators, and the use of the built-in loopback test
modes.
5.1 LED STATUS INDICATORS
The Model 1095RC features twelve front panel LEDs that monitor
power, the DTE signals, network connection and test modes. Figure
12 (below) shows the front panel location of each LED. Following
Figure 10 is a description of each LEDs function.
TD & RD glows yellow to indicate an idle condition of Binary
“1” data on the respective terminal interface
signals. Green indicates Binary “0” data.
CTS consists of 2 LEDs, 1 yellow, 1 green. CTS glows
green to indicate that the Clear to Send signal
from the modem is active. Yellow indicates inac-
tive CTS.
CD consists of 2 LEDs, 1 yellow, 1 green. CD glows
yellow if no carrier signal is being received from
the remote modem. Green indicates that the
remote modem’s carrier is being received.
DTR glows green to indicate that the Data Terminal
Ready signal from the terminal is active.
23
Pattern
Gen/Det
Loop
Contr
ol
Loop
Contro
l
Pattern
Gen/Det
Processor
Processor
Framer
Framer
Line
Figure 12. The Model 1095RC Series' front panel LEDs
Model 1092RC
TD
RD
NS
CTS
ER
LLB
511
RDL
511ER
CD
TM
DTR
Model 1095RC