IPmux-155L
Hub-Site Pseudowire Access Gatewa
The unit is used for:
Aggregating traffic from remote
pseudowire devices, such as IPmux-24
or IPmux-2L, at a small PoP or CO,
while eliminating the need for an
additional Ethernet switch.
Transporting STM-1 or E1 traffic over
PSN, saving TDM leased line costs.
PSEUDOWIRE FUNCTIONALITY
The ASIC-based architecture provides a
robust and high-performance pseudowire
solution with minimal processing delay.
The unit employs SAToP, CESoPSN and
TDMoIP pseudowire encapsulation methods.
Proper balance between PSN throughput
and delay is achieved via configurable
packet size.
A jitter buffer compensates for packet
delay variation (jitter) of up to 200 msec
in the network.
PSEUDOWIRE TIMING
End-to-end synchronization between
circuits is maintained by the adaptive clock
recovery mechanism.
Clock recovery conforms to G.823
interface using G.8261-defined scenarios.
The system clock uses master and fallback
timing sources for clock redundancy.
IPmux-155L also provides system clock
input and output via an external clock port.
SDH INTERFACE
The SDH interface provides direct access
to the Synchronous Digital Hierarchy
(SDH) transmission cores at the STM-1
level (155.520 Mbps).
SDH mapping mechanism collects payload
from 63 internal E1 streams and directs it
towards STM-1 link.
The physical STM-1 ports can be ordered
with field-replaceable SFP transceivers
with optical interfaces, for meeting a wide
range of operational requirements.
1+1 APS line redundancy ensures rapid
restoration of service in case of STM-1 line
failure.
AU4/TU12 pointer operation complies with
G.783, G.707 requirements. Trace
messages with 16-byte sequences (J1 and
J2 bytes) are generated and monitored.
E1 INTERFACE
32 external E1 interfaces provide
connectivity to any standard E1 devices.
E1 interfaces feature:
Integral LTU for long haul applications
G.703 unframed and G.704 framed
modes
CAS and CRC-4 bit generation (E1).
ETHERNET INTERFACE
IPmux-155L features the following PSN
ports:
Four Gigabit Ethernet ports with
SFP-UTP combo connectors
32 Fast Ethernet ports with fiber optic
SFP or UTP connectors.
The GbE interface operation complies with
IEEE 802.3, 802.1Q and 802.1p
requirements.
Link aggregation is performed as per
802.3ad (with or without LACP). This
enables operators to use up to four
Ethernet links as a single virtual interface,
sharing traffic load and providing link
resiliency.
G.8032 ETHERNET RING
The unit employs a G.8032 Layer-2
Ethernet ring mechanism to protect
against link and node failures.
ETHERNET OAM
IPmux-155L provides OAM to monitor and
troubleshoot the Ethernet network and
quickly detect failures. The OAM
mechanism operates according to IEEE
802.3ah requirements for fault indication
and loopback activation response.
Figure 1. Transporting Channelized STM-1/E1 Traffic over PSN
(13 Seiten)
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