# Unit Detail

# Unit Monitoring

# Displaying ESF Statistics

#### Bursty Errored Seconds

#### Controlled Slip Seconds

#### Displaying ESF Statistics

#### Done

#### Errored Seconds

#### Line Code Violations

#### Severely Errored Framing Seconds

#### Severely Errored Seconds

#### Stop/Start

#### Unavailable Seconds

#### Update

#### Displaying ESF Statistics

  The T1 Port ESF Statistics window, available on the T-FRAP, provides the user with physical Layer 2 Extended Super Frame (ESF) statistics collected on the Network T1 interface.
  To open the T1 Port ESF Statistics window:
  1 Position the mouse arrow over the Unit Detail window's graphical representation of the Network port, and click the right mouse button.
  2 Select ESF Statistics... from the list of pull-down menu options and click the left mouse button. The fields and buttons contained within the T1 Port ESF Statistics window are described in the following paragraphs.
  Note: The value displayed in parentheses represents the difference (delta) between values obtained during the previous polling interval and the current interval.
  ESF Statistics - Identifies Layer 2 statistics collected on ESF traffic passing through the Network T1 interface port.

#### ESF Statistics

  Errored Seconds ~ Count of errored seconds. This type of error occurs when either CRC errors or a loss of ESF frame sync is detected within a 1 (one) second interval.
  Severely Errored Seconds ~ Count of severely errored seconds. this type of error occurs when more than 320 CRC errors or 1 (one) or more ESF frame sync losses are detected within a 1 (one) second interval.
  Severely Errored Framing Seconds ~ Count of severely errored framing seconds. This type of error occurs when 1 (one) or more ESF frame sync losses are detected within a 1 (one) second intervals.
  Unavailable Seconds ~ Count of unavailable seconds. This type of error occurs when the signal is classified as "unavailable" due to excessive errors within a 1 (one) second interval.
  A signal is unavailable after receiving 10 (ten) consecutive severely errored seconds and will stay unavailable until 10 (ten) seconds has elapsed without a severely errored second occurring.
  Controlled Slip Seconds ~ Count of controlled slip seconds. This type of error occurs when a T1 frame is detected as being either replicated or deleted at the receiver within a 1 (one) second interval.
  Bursty Errored Seconds ~ Count of busty errored seconds. This type of error occurs when more than 1 (one) but less than 320 CRC errors are detected within a 1 (one) second interval.
  Line Code Violations ~ Count of line code violations. This type of error occurs when non-Binary 8-Zeros Suppression (B8ZS) violations of the Alternate Mark Inversion (AMI) protocol is detected. An excessive count usually indicates a B8ZS / AMI configuration mismatch in the T1 network.
  Stop/Start - Clicking this button stops and starts the statistics polling action.
  Update - Clicking this button will update (refresh) the counts of each T1 interface ESF statistic.
  Done - Clicking this button will close the T1 Port ESF Statistics window.