Hardware Owner's manual

Vision Access Boards
54 Telephony Hardware Manual
T1E1 Signal Status LEDs
The ALTI-VT1E1SM-1PT/ALTI-VT1E1-2 board has two LEDs to show the T1/E1 signal
status. They are located beside each RJ48C connector.
Signal status LEDs
Figure 4. LEDs showing signal status
Green LED Red LED Status
ON OFF Normal operation
OFF ON No signal
ON Flashing
Frame synchronization is okay, but one of the following
errors has
occurred:
• Bi-polar violation
• Line code violation
• System is receiving Yellow alarm from CO
• System is receiving Red alarm from CO
• Excessive zeros detected
OFF Flashing
Frame synchronization failed due to one or more
of the
following conditions:
Wrong frame type
Wrong line code
Clock not matched, causing massive frame slips
Cable between CSU and T1 port is too long (within 110 feet
is re
commended)
CRC checksum error (E1)
Alternating Temporary frame slip i
n normal operation
OFF OFF No power to the board