Installation and Operation Manual
Chapter
1 Introduction
ACE-3105, ACE-3205 Ver. 5.2
Overview
1-7
Clock Synchronization
ACE-3105, ACE-3205 provides robust clock synchronization and flexible timing
modes, including:
•
Clock recovery – a dedicated clock recovery module (optional; requires a
software license) allows ACE-3105, ACE-3205 to adaptively recover the clock
from a source device that distributes the ATM clock over a packet-switched
network, designed to meet the G.8261 requirements and depending on the
network's SLA
•
NTR clock recovery – ACE-3105, ACE-3205 supports clock synchronization via
NTR over SHDSL. In this case, the DSLAM provides the clock reference via the
DSL connection.
•
Interface-based synchronization – the clock is recovered from the RX traffic
of a selected interface, in accordance with G.823 and depending on the
network's SLA
•
Unicast clock distribution – the master clock is distributed with a dedicated
stream towards up to 32 remote PSN peers
•
Multicast clock distribution – The master clock is distributed towards the PSN
using a single IP multicast clock stream (IGMPv2 host).
The clock steam is generated at a rate of 100 PPS for every remote site.
For detailed information about the different system timing modes, see
For information about clock encapsulation over a PSN,
see
OAM and Diagnostics
ACE-3105, ACE-3205 provides comprehensive monitoring and diagnostic
capabilities, including:
•
Pseudowire connectivity check – ACE-3105, ACE-3205 periodically verifies the
connectivity status of pseudowire connections, using VCCV-BFD messages
according to the 'draft-ietf-bfd-base' requirements. If a failure is detected, a
notification is sent to both the remote peer and the ATM/TDM connection of
the specific PW. This allows complete monitoring over the pseudowire
connections in real-time. For more information, refer to
Appendix F
.
•
External and internal physical loopbacks on the E1/T1 ports
(user-configurable)
•
Cell test towards the ATM ports.
In addition, ATM/TDM and PSN port alarms are propagated over the
packet-switched network from end to end, towards both the BTS/Node B side
and the BSC/RNC side. This includes the mapping of:
•
Packet-switched network alarms to ATM/TDM alarms
•
ATM/TDM alarms over the PSN to the remote customer equipment (CE)
•
Physical failures of ATM/TDM ports, over the packet-switched network
towards both the local and remote CE.
