Verilink QUAD/IMUX (880-502392-001) Product Manual User Manual
Page 74
Performance Monitoring
5-6
Verilink QUAD/IMUX User Manual
A sample Errored Seconds report is shown in
. To see this
display for Port 2, type “E2” from the Performance/Status Menu.
CRC4
This field will say "CRC6" for T1 versions and "CRC4" for E1 versions of the QUAD
2164.
Cyclic Redundancy Check is an error-checking algorithm performed on data
transmissions. In simplified terms, 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 usually
indicate one or more transmission errors.
BER EX
Indicates that the configured Bit Error Rate threshold has been exceeded. The BER
threshold determines the level above which a CSU alarm is generated and reported.
Selecting 10E-9 will report more errors than 10E-4.
Restore State
Shows the current condition of each port. OOS (Out Of Service) means that the port
has been removed from service by the IMUX 2160. If a port is removed from service,
it will not be placed back into service until the configured parameters for Line
Restoral are met. See the Line Restoral section in Chapter 3 (E1) or Chapter 4 (T1).
En
Errored Seconds-Path—The number of seconds that a CRC-4 error occurs on the line.
Dn
Errored Seconds-Line—The number of seconds with one or more code violation -
lines.
Sn
Severely Errored Seconds-Path—The number of one second intervals with 320 or
more CRC-4 errors.
Qn
Severely Errored Sec-Line—The number of severely errored seconds with code
violation - line errors.
Un
Unavailable Seconds—Every second in which an Unavailable Signal State occurs with
the onset of 10 contiguous SES errors.
Fn
Frame Alignment Error Seconds—This error occurs when the frame alignment
threshold of 10E-3 errors in a given second is exceeded.
Cn
Code Violations-Path—The number of CRC-6 (for ESF framing) errors that will be
tolerated before the line is removed from service.
Vn
Code Violations-Line—The number of BPV errors in any 15 minute time period that
will be tolerated before the line is removed from service.
Hn
Failure Events-Path—The frame errors on the path connection.
Gn
Failure Events-Line—The frame errors on an individual line on a path.
Bn
Background Block Error—An errored block (2000 bits per block) not occurring as part
of an SES. This alarm condition is less serious than an SES.
Rn
Reset Registers—Use this option to zero out all the performance and status registers.
T
Line Threshold Status—Displays the count and amount exceeding the threshold
value for SES, UAS, and CRC.
A
Threshold Alert Status—Displays the count, an indication if the threshold value has
been exceeded (Y or N), and the interval for LOF, LOS, RAI, AIS, and BPV.
X
Exit this menu—Use this option to return to the Main Menu.
Field/Command
Description