User Guide: Technical Reference
SECTION 3 OPERATING THE
ioLink 4
PRELIMINARY
Customer Support (202) 333-7031
-3-2
3.1.1 LED Indicators
The front panel’s five LEDs indicate the status of the link. The following table describes each light.
Table 3-1. Light Emitting Diode (LED) Indicators
LED
Color
Meaning
Pwr
Green
The unit is connected to line power and the internal power supply is supplying 5 V.
TX
Green
Indicates the unit is receiving valid input at the DSX or G.703 interface.
RX
Green
Indicates the unit is receiving valid information from the RF unit.
RF
Red
Indicates the signals received from the RF unit are either too weak or non-existent.
Alm
Red
Indicates an alarm condition exists. The specific alarm will then be displayed in the
ALARM Menu on the LCD.
In normal operation, only the green “Pwr,” “TX,” and “RX” LEDs are lit. If the system encounters any
problem, the red “RF” and/or the “Alm” LEDs will light up. If either the “RF” or the “Alm” LED is on, the
LCD will show an error message. (See Section 5, Troubleshooting.)
3.1.2 Keypad and LCD
To interact directly with the
ioLink 4
, use the LCD and the four-key keypad on the front of the modem unit.
The information that may be displayed on the LCD is arranged into five cyclical menus: STATUS,
CONFIG, TEST, ALARM, and ADVANCED. Using the arrow keys on the keypad, you can:
•
Cycle between the five menu headings (<- -> at the top pages of each)
•
Scroll through each of the menus (/\) and (\/)
•
Change options in the CONFIG, TEST and ADVANCED menus.
These menus are cyclic. Thus, paging down past the last menu item listed in each column would return
the display to the top. Also, the headers for the menus are linked this way as well. By pressing both the
up and down keys simultaneously, the display is automatically returned to the current menu heading.
