28 TimeHub 5500 User’s Guide 097-55501-01 Revision M – January 2009
Chapter 1 Description
Functional Overview
Communication Ports
LAN
The LAN connection allows you to connect the TimeHub 5500 to an Ethernet
network for monitoring and provisioning. You configure network parameters using
TL1 commands. The TimeHub 5500 can support up to 10 simultaneous network
sessions. The TL1 commands are described in detail in the TL1 Reference Guide.
Local
There are two Local port connections: one on the rear panel of the shelf and one on
the Management card. Dual connections are provided for access convenience and
both are physically connected to the same serial port. These ports provide a means
for TL1 command access to the TimeHub 5500.
Power Supply
Each card is provided with its individual power supply unit. Two external power
inputs supply the voltage to each card on the shelf.
Input/Alarm Connector Module
The Input/Alarm Connector module provides the connections for input reference
signals to the shelf and for the alarm outputs. There are five timing inputs: one PRS
input and four DS1 inputs. The PRS input can be either 5 MHz or 10 MHz.
Depending on the type of Clock card used, four additional DS1 timing inputs can be
used for monitoring only.
DS1 inputs 1–4 can be used as a reference or for monitoring. (DS1 inputs 5–8 can
only be monitored.) If used as a reference, the input may be used for tracking and
can cause events or alarms if not qualified. Performance monitoring is also
available for inputs used as references. If monitored only, the input is monitored
without being used for tracking and no alarms occur, but the signal status is
reported via the TL1 interface.
You make the alarm connections on the Input/Alarm Connector module as
described in Alarm Connections, on page 32.
Note: Communication cannot be established to both of the Local
ports simultaneously; only one port can be used at a time.
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