42Chapter 1: Introduction to the EIU
—the EIU state
•During normal operation, the default EIU routes all messages to the CM. If there is a problem with the default EIU or its links, the following occurs:
—the default EIU advertises to the network that it is no longer available (or in the event of a
—another provisioned EIU advertises that it is the router (net hop) to the
•During normal operations, if there is a problem with the
Applications running on the EIUs must have sparing defined at the application level.
Billing
EIUs do not directly affect billing functions.
Service orders
The EIU does not affect service order functions.
User interface characteristics
The EIU uses the existing peripheral user interface (UI) based on the DMS MAPCI. The MAPCI includes additions to the PM level of the MAP display to include the new hardware components. Figure 10 shows the hierarchical relationship for the MAP levels used for the components.
Figure 10 MAP display level hierarchy
| PM level |
|
Existing | EIU level | EXND level |
peripheral |
| (LAN devices) |
modules |
|
|
|
|
|