22 097-55501-01 Issue 6 – June 2003
1
TimeHub 5500 System Guide
1.3.1 Communication Ports
1.3.1.1 LAN
The LAN connection provides a means for the TimeHub 5500 to be accessed
via Ethernet. Network parameters are configured using TL1 commands.
TimeHub 5500 can support up to 10 simultaneous network sessions.
1.3.1.2 Local
There are two Local port connections: one on the rear 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.
1.3.2 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.
1.3.3 Timing Inputs
The TimeHub 5500 Shelf has five timing inputs: one PRC input and four
DS1 inputs. Optionally, four additional DS1 timing inputs can be monitored,
depending on the type of clock card used.
DS1 inputs 1–4 can be used as a reference or can be monitored. (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 indicated via the TL1 interface.
1.3.4 Synchronization Status Messaging
The TimeHub 5500 supports input and output of SSM (Synchronization
Status Messaging). SSM provides a method for providing clock quality
information to any equipment that uses synchronization inputs. For DS1
signals, SSM information can be encoded on ESF (Extended Super Frame)
N
OTE
: Communication cannot be established to both of the
Local ports simultaneously; only one port can be used at a
time.
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