Chapter 10: Packet over SONET Modules
Packet over SONET (POS) Module Types
SmartBits System Reference
137
Packet over SONET (POS) Module Types
•
SmartMetrics POS Modules (POS-3500B/3500Bs, POS-3502A/3502As,
POS-3504As)
Similar to the Ethernet SmartMetrics modules, the POS SmartMetrics modules have
the SmartBits signature field per frame enabling advanced tracking of every frame,
producing results in the following formats:
–
Sequence Tracking.
–
Latency over Time.
–
Latency per Stream.
–
Latency Variation.
–
Latency Distribution.
–
Raw Tags.
Additionally, the SmartMetrics type enables the generation of thousands of streams
and millions of flows per port, that may vary according to the application and the
memory limitations of the host computer running the application.
•
TeraMetrics POS Module (POS-3505As)
This module includes the SmartMetrics functionality plus dedicated hardware that
supports a Pentium/Linux based open-architecture platform. This supported platform
allows the integration of Spirent Communications software with other powerful third
party programs, to provide optimum testing systems.
In addition, the on-board processing power of the TeraMetrics module enables total
traffic generation and measurement in excess of 1 terabit per second.
SONET
SONET and its European cousin Synchronous Digital Hierarchy (SDH) are octet-
synchronous multiplexing schemes that define a family of standard rates and formats.
Transmission rates are integral multiples of 51.840 Mbps:
•
OC-3c/STM-1
155.520 Mbps.
•
OC-12c/STM-4
622.080 Mbps.
•
OC-48c/STM-16
2488.320 Mbps.
SONET/SDH is a perfect match for PPP (Point-to-Point Protocol). The PPP octet stream
is mapped into the SONET/SDH Synchronous Payload Envelope (SPE) with the octet
boundaries aligned to the SPE octet boundaries, enabling the seamless integration within
IP networks of SONET/SDH-smart routers and IP network elements.
PPP over SONET is a high-speed WAN transport mechanism capable of carrying IP traffic
with a minimum of overhead. It is described in RFCs 1619 and 1662 as the serial
transmission of data over SONET frames through the use of Point-to-Point Protocol (PPP).
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