Specifications

D8E1T1 Installation and Operation Manual Chapter 4 Troubleshooting and Diagnostics
Diagnostics Center (Diagnostics Manager Menu) 4-3
From the Diagnostics Manager Menu, a submenu may be viewed or invoked to
perform additional diagnostic actions such as loopbacks, BERT, and viewing
additional statistics including G.826 statistics.
To clear counters for all 8 links, press C.
The information contained in each field on the screen is detailed in the following
tables.
Table 4-2. Diagnostics Manager Field Descriptions – Link Fields
Field Description
Link Name:
(display field)
Displays the user-defined name for the link, which was entered via the Configuration
Menu.
DS1/E1 State:
(display field)
This field displays the current status of the T1 or E1 link as one of the following:
• AIS - Alarm Indication Signal: AIS is set when fewer than three zero bits are
received in 512 consecutive bits or, optionally, in each of two consecutive periods
of 512 bits.
• CFA - Change of Frame Alignment: CFA is declared each time the offline framer
generates a reframe pulse that aligns the receiver timebase to a new bit position.
• *ERROR* - Undetermined error type or more than one of the above/below errors
present.
• LOF - Loss of Frame: Receive Loss Of Frame is declared when 3 consecutive FASs
have been received in error or, additionally, if bit 2 of NFAS frames has been in
error for 3 consecutive occasions.
• LOS - Loss of Signal: LOS is declared if 32 contiguous zeros have been received.
• OK - Link is In Service and functioning properly. Inactive - Link is out of service.
• RED - Red Alarm: Red Alarm or Carrier Fault Alarm declared when an out-of-
frame condition has been present for 2.55 sec (± 40 ms).
• RX-SLIP - Receive Slip: Controlled slip has been detected on the incoming path.
• SEF - Severely Errored Frame is reported when the receive signal does not meet
requirements of ANSI T1.231. SLIP - Slip has been detected in both the incoming
and outgoing paths.
• TX-SLIP - Transmit Slip: Controlled slip has been detected on the outgoing path.
• UnderTst - BERT is currently running on the link.
• YEL - Yellow Alarm: For T1, declares a Yellow Alarm when the Yellow pattern has
been received for 425 ms (± 50 ms). For E1, declared when an Alarm Indication is
received via TS-0 overhead (E1).
DS1/E1 ErrSecs
(Errored Seconds):
(display field)
Displays the number of errored seconds that have occurred on the T1 or E1 link since
the last time that the counter was reset. The occurrence of a Loss of Frame, CRC6, or
CRC4 error in a one-second period is known as an errored second.
Link Loop:
(display field)
This field displays the type of diagnostic loop that has been enabled, or Off is
displayed if no loop has been enabled. A depiction of various loop types is provided
in Figure 4-7.
Bkpln Loop
(Backplane Loop):
(display field)
On displayed in this field indicates that a backplane loop is enabled. A depiction of
various loop types is provided in Figure 4-7.