Software Installation 31
Possible Problem
If at least one modem card is not inserted in the T1 Modem Bank unit, the line card will busy out the lines
associated with that line card.
Restarting POST
Cycle the T1 Modem Bank’s power off, then on again to restart POST.
Display Panel Status Indicators
Once the POST is completed, P1 will be shown on the display panel to indicate that the T1 Modem Bank is ready
for download. P2 indicates that the PING signal has been received; P3 will flash briefly on the screen, indicating
that the download has started. P4 indicates that a download is underway. At the same time, the LEDs will blink as
packets are counted.
The following sequence appears on the display panel: PE, D0, C1, C2, C3, C4. When the download is received and
if the checksum has been validated, AC is then shown in the display, indicating that the T1 Modem Bank has been
programmed, FEP is running, and the T1 Modem Bank is on-line. At the same time, the LEDs on the display panel
will appear to march one by one through the display panel LEDs. This process takes about 30 seconds. The user can
then push the right or left arrow push buttons to cycle sequentially through the displays which are described in Table
5. The left push-button is used to program the T1 Modem Bank; the right is used to scroll through and locate the
desired mode.
There are several classes of LED displays that appear on the display panel. Each class has a different meaning, as
described below:
• CSU (Channel Service Unit) display the text for CSU display is vertically positioned and appears as follows:
AMI/B8ZS SF/ESF RED YELLOW BLUE L LOOP R LOOP CSU/DSX-1 D&I LOS. See the L1
description in Table 5.
• Channel variablethe seven-segment channel number indicates the node number of each modem found,
ranging from 1 - 24. The text for the data and handshake signals is marked as TD RD RTS CTS DSR
DCD DTR RI OFC IFC just above the LEDs on the display panel faceplate. See the CHAN # description
in Table 5.
• Countersencompass all other displays shown (See Table 5.) These counters use a percentage ranging from 0
to 100%, (shown below the LEDs in Figure 16 on page 28) and indicate line utilization, packet count, errors per
second, processor utilization, and so on. Counters may be reset to 0 by pressing both buttons simultaneously.
Counters provide a rough magnitude number. If more information is needed, QuickManager must be used.