Timing interfaces
...................................................................................................................................................................................................................................
Metropolis
®
AMU provides one external timing input and output per main card for
ITU-T compliant 2MHz / 2Mb/s timing signals, see also
. The timing output is realized as RJ45 connector suitable for symmetrical
twisted pair cables with an impedance of 120
Ω
or coaxial cables with an impedance
of 75
Ω
.
Real time information survival
The system contains a realtime clock cicuit which can survive a power outage of up to
10 minutes. In case the power is restored within this time, the Fault Management
(alarm event timestamping) and Performance Monitoring (binning, reporting, TCNs)
functions will continue without requiring user intervention.
Synchronization and timing
•
Synchronization can be derived from the incoming STM-1 or STM-4 or STM-16
aggregate signals and STM-1 or STM-4 tributary signals.
•
Synchronization can be derived from an incoming 2 Mbit/s (E1) data input.
•
Re-synchronization of the 2 Mbit/s ports is supported.
•
Support of SSM byte according to ETSI ETS 300 417-6.
•
External synchronization input at 2.048 MHz and 2 Mbit/s (STCLK, one per main
card) is according to G.703-10 via RJ45 connector with an impedance of 120
Ω
symmetrical or with an impedance of 75
Ω
.
•
Internal Clock in accordance with ITU-T G.813 option 1.
Features
...................................................................................................................................................................................................................................
365-312-847R4.0
Issue 4, November 2006
Lucent Technologies - Proprietary
See notice on first page
3-11
