Maintenance-Object Repair Procedures
555-233-143
8-194 Issue 1 May 2002
g. Error Type 513 — The ATM Crosstalk test failed. The board is either
writing to or reading from a TDM time slot that is not allocated to the board.
1. Test the board (test board UUCSS), and follow the test procedures
suggested for this test. In random tests of a single DSP during low
or high traffic, the same DSP can be tested more than once.
h. Error Types 769 and 770 — are board-degraded alarm errors that result
when the ATM switch is sending corrupted cells or excessive AAL/LAP-D
retransmissions (off-board ATM cell corruption errors). These errors
indicate the detection of a problem in handling ATM cells that are received
from the fiber interface.
Aux Data:
The problem is most likely not on the ATM-EI circuit pack reporting the
errors, but it could be due to one or more of the following reasons:
■ The fiber is not snugly connected to either the board or the ATM
switch.
■ The EPN’s packet bus is corrupting the cells. See ‘‘PKT-BUS
(Packet Bus)’’ (Aux Data 35 only).
■ The fiber between the ATM switch and the ATM-EI is too long
(greater than 2 km for multimode fiber). Use loopback to see if the
fiber is corrupting the cells.
■ Some other ATM-EI board is not receiving the cells properly.
■ The intervening ATM switch is dropping the ATM cells due to a
shortage of bandwidth, or the S8700 Multi-Connect system is using
more than the subscribed bandwidth.
Error Type 771 — The ATM switch is sending cells with unknown VPI and
VCI address (wrong connection).
1. Ensure that the ATM-EI board address on the ATM switch matches
the ATM-EI (ATM) address on the S8700 Multi-Connect side.
i. Error Types 1024-1151 — These errors represent problems detected by
the ATM-EI board in response to SETUP and ADDPARTY requests from
software.
■ The Error Types and descriptions are in Table 8-81 on page 8-195.
■ Aux Data values represent port network and angel numbers and are
in Table 8-82 on page 8-196.
Error
Type
Aux
Data Description
769 34 Excessive AAL-5 retransmission requests
769 35 Excessive LAP-D retransmission requests
770 25 Uncorrectable ATM cell headers – threshold
771 26 VPI, VCI pair unknown
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