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5.0 OPERATION
Once you have configured the Model 2450 properly (see Section
3.0) and made line, DTE and power connections correctly (see Section
4.0), you are ready to operate the unit(s). (Note: the unit is operational
as soon as power is applied–there is no power switch.) This section
describes the LED status monitors, and use of the built-in V.54 and V.52
test modes.
5.1 LED STATUS MONITORS
The Model 2450 features six front panel status LEDs that indicate
the condition of the unit and communication link. Figure 6 (below)
shows the front panel location of each LED. Following Figure 6 is a
description of each LED's function.
• “TD” (Transmit Data) glows red to indicate an Idle condition or
Binary “1” data. Green indicates Binary “0” data.
• “RD” (Receive Data) glows red to indicate an Idle condition or
Binary “1” data. Green indicates Binary “0” data.
• “CD” (Carrier Detect) glows green when carrier is active. In 64
Kbps mode, CD glows red if there is no carrier, or if a bipolar
violation occurs. In 56 Kbps mode, CD glows red if there is no
carrier, if an Out-of-Service or Out-of-Frame violation occurs,
or if idle code is detected.
• “NS” (No Signal) glows red when there is no valid carrier. This
means the Model 2450 receiver has not detected a valid signal
from the digital service provider, or, in the case of short-haul
operation, from the remote Model 2540. If NS is lit, check for
an unplugged cable, broken wire or an incorrect Line Rate
selection.
4.2 DTE (TERMINAL) CONNECTION
The Model 2450 is wired to connect to a DTE. If your terminal
device is DCE, call Patton Technical Support at (301) 975-1007 for
specific installation instructions.
Four versions of the Model 2450 are available, with respect to DTE
interface and connector type (see Appendix C). All versions connect to
the DTE using a
straight through
cable. When constructing or
purchasing your interface cable, refer to the pinout diagrams in
Appendix D.
4.3 AC POWER CONNECTION
Power is supplied to the Model 2450 by a 10 VAC, 1 A wall mount
transformer. This transformer connects to the Model 2450 by means of
a cannon jack on the rear panel. The Model 2450 is powered-up as
soon as it is plugged into an AC outlet–there is no power switch.
4.3.1 120 VAC Power (US)
The 120 VAC adapter supplied with the standard version of the
Model 2450 is a “wall mount” type, and may be plugged into any
approved 120 VAC wall plug.
4.3.2 230 VAC Power (IEC)
The 230 VAC adapter supplied with the “international” version of the
Model 2450 is equipped with an IEC-320 shrouded male connector.
This connects with one of several available country-specific power
cords (see the ordering information in Appendix C). You may
purchase these power cords from Patton Electronics, or from a local
vendor of your choice.
9 10
Figure 6. Front view of Model 2450
Model 2450 MiniLink-I 56/64 CSU/DSU
TD RD
CD
NS
V.54 Test
Modes
Remote
Normal
Local
Error
Test
511
511E