Verilink AS2000: The Basics (880-502981-001) Product Manual Manual do Utilizador Página 31

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Verilink Access System 2000: The Basics 3-1
Chapter
3
Site Planning
This chapter provides general information for site planning.
Sections within this chapter provide general and detailed
information on the following topics:
Installation planning
FCC Part 68 Compliance Statement
Application requirements and ESD considerations
Installation Planning
When planning a site or adding to an existing AS2000, several
factors require consideration:
General rules for module installation
Cabling requirements
Mechanical and environmental considerations
Node Configuration Plan
Module
Installation
Access System 2000 modules within each system node have
explicit requirements for installation.
TABS-Based Nodes
The following requirements are for TABS-based nodes.
The SCC or NCC and corresponding CIM usually resides in
Shelf 1, Slot 1.
DIUs follow the corresponding SCC, NCC, or TAC in successive
slots.
The TIU clock signal can be passed to other shelves in the
node using the data bus expansion cable.
All DIUs associated with an NCC, SCC, or TAC must be in the
same shelf when the data buses are not extended.
NCC, SCC, and TAC modules can use one data bus—A, B, or C—
to exchange data with their associated DIUs.
In drop-and-insert mode, only Bus A is used.
A node must not exceed four shelves (2 MLS and 2 DLS units
with an NCC, or 4 MLS units with an SCC or NCM).
Certain TABS-based modules cannot function in the Quint-line
shelf, such as the NCC and the SCC.
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