Verilink QPRI 2921 (880-503143-001) Product Manual - Manual (Page 58)

Configuring the QPRI 2921 Via the NCM 2000 Craft Interface
3-24 Verilink QPRI 2921
Table 3-16 Performance/Status Menu Commands .
Performance /
Status Menu
(24hr T1
Performance
Data Summary)
Select P for “display performance data” from the
Performance/Status Menu, Figure 3-17, to access the
Performance/Status Menu (24hr T1 Performance Data
Summary), Figure 3-18.
Command Description
P Display performance data—Displays the totals for the more common errors and alarms, and
provides a menu for more detailed, 15-minute incremented, 24-hour time-period buffer
records. Figure 3-18, Table 3-17.
T Threshold status—Displays the Net Port Alarm Threshold Status Menu, Figure 3-19.
C Display counters—displays the Counter Menu, Figure 3-20, Table 3-18.
Counts the number of BPV, FE, ESF, and CRC errors:
Bipolar Violations (BPV): A violation of the T1 bipolar alternate mark inversion transmission
pattern in which consecutive ONEs (pulses) are erroneously transmitted as pulses of like
polarities. Bipolar violations normally indicate transmission errors.
Frame Bit Error (FE): The number of whole seconds in which a framing bit error has been
received.
Extended Superframe Format (ESF): This is the AT&T T1 framing standard that provides
frame synchronization, cyclic redundancy check, data checking, and link bits. This counter is
only available in ESF mode.
Cyclic Redundancy Check (CRC): An error-checking algorithm performed on data
transmissions. On a frame-by-frame basis, a numerical value is derived from the data in the
bit stream at one end of transmission. When each frame reaches the receive end, the cyclic
redundancy check is calculated again and compared with the value generated by the
transmit-side data. Discrepancies can indicate one or more transmission errors. This counter
is only available in ESF mode.
Options are:
Rn—Reset counters, which resets the counter for the indicated port number.
X—Exit this screen, which returns you to the Performance/Status Menu.
X Exit the Performance/Status Menu—Returns to the Main Menu, Figure 3-1, Table 3-2.