18 097-55501-01 Issue 6 – June 2003
1
TimeHub 5500 System Guide
1.1 Overview
The TimeHub 5500 is a building integrated timing supply (BITS) redundant
timing distribution system for 1.544 Mb/s primary rate networks. The
system tracks incoming timing references, qualifies the signals against
network timing standards, then filters and distributes precise timing to all
network elements in the node.
The TimeHub 5500 clock uses precision timing references such as Primary
Reference Clocks (PRCs) (cesium frequency standards), GPS Primary
Reference Source (PRS) receivers, and DS1 input references from other
nodes to generate synchronized composite clock (CC) (64 kb/s) and DS1
(1.544 Mb/s) timing output signals. These signals provide timing
synchronization inputs to various network elements. If required, the
TimeHub 5500 provides SmartClock holdover that exceeds Stratum 2
accuracy.
TimeHub 5500 applications include providing timing synchronization for
ATM, SONET, and digital wireless networks.
1.2 Physical Description
The TimeHub 5500 consists of a shelf, wire-wrap panel(s), plug-in cards,
connector modules, cables, hardware, and software. Options include clock
cards with four additional DS1 inputs for a total of nine inputs.
The shelf (Figure 1-1) and the connection panel(s) can be mounted in a 19
inch rack or a 23 inch rack. Other than a communications connector on the
management card at the front of the shelf, all connectors are at the rear of
the shelf and connection panel(s).
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