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5.2 POWER-UP
There is no power switch on the Model 1180RC/1184RC: Power is
automatically applied to the 1180RC/1184RC when its card-edge con-
nector makes contact with the chassis' mid-plane socket, or when the
chassis' power supply is turned on. Note: The 1180RC/1184RC is a
"hot swappable" card—it will not be damaged by plugging it in or
removing it while the rack is powered up. When the local and remote
Model 1180RCs/1184RCs are both powered up, and are passing data
normally , the following LED conditions will exist:
• PWR = green
• TD & RD = flashing red and green
• RTS & DCD = green
• TEST = off
5.3 LOOPBACK TEST MODES
The Model 1180RC/1184RC offers two loopback test modes to
evaluate the condition of the modems and the communication link (see
Figure 11, below). Both tests can be activated physically from the front
panel, or via the RS-232/V.35 interface.
TD
TX
RD
RX
Local 1180RC/1184RC
In Normal Mode
TX
TD
RD
RX
Local 1180RC/1184RC
In Analog Looback
TX
TD
RX
RD
Local 1180RC/1184RC
Remote Looback
Figure 11. Local and Remote Loopback Test Modes
RD
RX
TD
TX
Remote 1180RC/1184RC
In Normal Mode
RX
RD
TX
TD
Remote 1180RC/1184RC
In Normal Mode
RX
RD
TX
TD
Remote 1180RC/1184RC
In Normal Mode
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5.3.1 ANALOG LOOPBACK
The Analog Loopback test checks the operation of the local Model
1180RC/1184RC, and is performed separately on each unit. Any data
sent to the local Model 1180RC/1184RC in this test mode will be
echoed (returned) back to the user device. For example, characters
typed on the keyboard of a terminal will appear on the terminal screen.
To perform an analog loopback test, follow these steps:
1.
Activate Analog Loopback. This may be done in one of two
ways: (1) by moving the front panel toggle switch RIGHT to
"Analog", (2) by raising the LAL signal pin on the RS-232/V.35
interface. Note: Make sure switch SW1-7 is enabled. Once
Analog Loopback is activated, the Model 1180RC/1184RC
transmit output is connected to its own receiver. The "TEST"
LED should be lit.
2.
Verify that the data terminal equipment is operating properly
and can be used for a test.
3.
Perform a BER (bit error rate) test on the system, using exter-
nal test equipment.
4.
Perform a BER test on each unit. If the BERT test equipment
indicates no faults, and the data terminal indicates a fault, fol-
low the manufacturer's checkout procedures for the data ter-
minal. Also, check the RS-232/V.35 interface cable between
the terminal and the Model 1180RC/1184RC.
5.3.2 REMOTE LOOPBACK
The Remote Loopback test checks the performance of both the
local and remote Model 1180RCs/1184RCs, and the communication
link between them. Any characters sent to the remote Model
1180RC/1184RC in this test mode will be returned back to the originat-
ing device. For example, characters typed on the keyboard of the local
terminal will appear on the local terminal screen after having been
passed to the remote Model 1180RC/1184RC/1184RC and looped
back. To perform an RDL test, follow these steps:
1.
Activate Remote Loopback. This may be done in two ways:
(1) by moving the front panel toggle switch LEFT to "Remote",
(2) by raising the RDL signal pin on the RS-232/V.35 inter-
face. Note: be sure that DIP switch SW1-8 is enabled.
2.
Verify that the DTE equipment on the local end is operating
properly and can be used for a test.
3.
Perform a BER test on the system, using external test equip-
ment.
4.
If the remote BER test indicates that errors are present, and
the local analog loopback/BER tests showed that both Model
1180RCs/1184RCs were functioning properly, this suggests a
problem with the FIBER between the two modems. If you still
have errors, call Patton Technical Support at (301) 975-1007.
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