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Chapter 1: Introduction to the EIU 41
DMS-100 Family EIU User Guide TELECOM12
The information in table 2 defines the port requirements for EIU installation.
EIU provisioning
Provisioning of EIUs is application dependent. The number of EIUs required
and their configuration is determined by a combination of product and
software criteria. EIUs are not provisioned on a switch unless required by the
application.
Where possible, provision two or more EIUs connecting to a single LAN to
improve reliability. This redundancy may not be required if duplication is
provided at a higher system level (for example, duplicate LANs).
Observe the following provisioning rules:
• although the maximum number of EIUs in a switch is limited to eight
(limitation imposed by software), the actual number that you can provision
per platform is determined by engineering rules (refer to Provisioning
Rules for LPP, SSLPP, and SNSE LIS, System Engineering Bulletin SEB
92-02-001
• each EIU requires one LIU position (two slots) in a 36-position LPP
• each EIU has a fixed memory capacity; the NTEX22BB contains 8 Mbyte
of RAM, and the NTEX22CA contains 32 Mbyte of RAM
For more information on datafill, refer to “Chapter 3: EIU datafill”. For more
information on maintenance impact on spares, refer to “EIU sparing
requirements” on page 101.
EIU sparing and redundancy
The DMS switch and the EIU support load balanced routing. Characteristics
related to provisioning and options are described in the following points:
• In table IPNETWRK, one EIU is defined as the default for the CM.
• In table IPROUTER, all EIUs are defined.
• Maintenance software ensured that all EIUs are aware of the states of all
other EIUs. States are known for the following:
— links between the EIU and the LAN-side subnet
— links between the EIU and the SuperNode-side subnet
Table 2 DMS-bus port engineering requirements for peripherals
Peripheral Message Switch Comments
links per plane Port Card Paddle Board
LPP (DS-30) 4 NT9X17AA NT9X23BA 1 LPP requires 1
MS port card