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Cisco

2-Port OC-48c

OC-48c/1-port OC-48c DPT OSM

Two-Port OC-48c POS/
One-Port OC-48c DPT
Optical Services Module

The anticipated dramatic growth of

metropolitan-area networks (MANs) is

forcing a reevaluation by service providers

of the optimal use of their existing transport

infrastructure. Synchronous Optical

Network (SONET)/Synchronous Digital

Hierarchy (SDH) technology will remain a

pervasive transport technology because of

its well-proven, low-delay restoration and

resiliency capabilities. Nevertheless, there is

a growing recognition that efficient

transport of data traffic in the MAN will

require a new class of transport distribution

networks. The evolving transport

technologies that will support these

distribution networks must retain the

outstanding resiliency and restoration

capabilities of SONET, while delivering

improved bandwidth multiplexing

capabilities that can be delivered only by a

packet-based transport. One of the most

promising of these new transport

technologies is Cisco Dynamic Packet

Transport (DPT), which is based on the

emerging resilient packet ring (RPR) IEEE

standard.

To meet these requirements, Cisco Systems

offers a new Optical Services Module

(OSM) for the Cisco 7600 Series Routers

and Catalyst 6500 Series Switches that is

configurable via software to be used either

as a two-port OC-48c/STM-16

Packet-over-SONET (POS) module, or as a

one-port OC-48c/STM-16 DPT module.

The ability to configure this module for use

in either POS networks or DPT networks

provides the flexibility that service

providers will need to adapt their

distribution network to the rapidly

increasing data traffic of their end

customers. In addition, this module also

provides four Gigabit Ethernet interfaces to

provide additional data connectivity within

the carrier’s central office. This new Cisco

7600 Series Optical Service Module enables

service providers to scale WAN bandwidth

and performance to OC-48 speeds, while

offering the flexibility to adapt to the

distribution network architecture that will

deliver the wide range of Layer 2 and

Layer 3 services that their customers are

demanding (refer to Figure 1).

The Cisco 7600 is a high-performance

router, which evolves from a specific set of

Cisco Catalyst

®

 6500 Series foundation

elements combined with new optical-speed