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104 Chapter 4: EIU maintenance
297-8991-910 Standard 03.01 August 1999
EIU MAP level
EIU information is available on the maintenance and administration position
command interface (MAPCI) display under the PM level. The command to
access the EIU MAP display is as follows:
>MAPCI;MTC;PM;POST EIU n|ALL
where
n is the EIU index
The maintenance actions implemented for an EIU are similar to those required
for any other application-specific unit (ASU) on the LPP.
Manual busy state
The EIU can be set to the manual busy state from the following states:
• Offl, the off-line state
• InSv, the in-service state
• IsTb, the in-service trouble state
On the MAP display, manual busy is shown as ManB.
The EIU software load can be downloaded to the EIU processor only in the
ManB state through the LOADPM command. When the EIU is in either the
ManB or the Offl states, it is not actively transmitting messages on the Ethernet
LAN. However, in a ManB state, if the EIU contains the correct IP address
information database, it may communicate to other SuperNode nodes, such as
function processor (FP) or computing module (CM).
In-service state
The EIU can be set to the InSv state only from ManB state. When the EIU is
returned to service, the IP address database along with other IP throttling and
engineering data is downloaded to the EIU. When the EIU is in the InSv or
IsTb state, it can actively communicate to both the Ethernet LAN and the
frame transport bus (F-bus).
EIU diagnostics
EIU diagnostics run in the background. This section describes the diagnostics
provided for the EIU.
Out-of-service diagnostics
A complete set of EIU out-of-service diagnostics are executed during the
ManB to InSv state transition. The EIU is not allowed to return to service if
any one part of the diagnostics fail. The faulty card-list does not appear on the
MAP display and the system generates PM logs that can help isolate the faulty
card. The components level isolation of the fault is not available through logs