Cisco Dynamic Packet Transport Spare PA-SRP-OC12MM= Scheda Tecnica

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Cisco 7500 and Cisco 7200 Series Router OC-12c/STM-4
Dynamic Packet Transport Port Adapter

Dynamic Packet
Transport

Inner Ring Data

Inner Ring

Control

Outer Ring Control

Outer Ring

Data

The DPT port adapter is designed to be

deployed in SONET OC-12c/STM-4 DPT

rings. DPT rings can also be connected to

SONET add drop multiplexers (ADMs),

thus allowing for the creation of small or

very large DPT rings. DPT is media

independent, capable of operation over

dark fiber, SONET/SDH gear, and WDM

infrastructure.

DPT rings are dual, counter-rotating fiber

rings. Both fibers are concurrently utilized

to transport both data and control traffic as

depicted in Figure 1.

DPT rings run on a variety of transport

technologies including SONET/SDH,

wavelength division multiplexing (WDM),

and dark fiber. DPT provides carriers with

the flexibility to operate packet rings over

their embedded fiber transport

infrastructure and provides an evolution

path to packet-optimized transport for

high-bandwidth IP networks. The DPT port

adapter also provides the choice of

multimode or single-mode intermediate

reach, single-mode long and single-mode

extended reach optics to meet application

requirements.

The DPT port adapter provides the

following features:

• Accommodates large-scale network

topology

• Leverages fiber-optic capacity at

OC-12c/STM-4

• Controls the rate at which new packets

are inserted on the media

• Allows data to obtain fair-shared access

to the OC-12c/STM-4 rings

• Implements protection mechanisms,

including wrap and unwrap in the event

of fiber or node failure

• Supports both single-mode (SM) and

multimode (MM) fiber transmissions

• Supports access to the SONET DCC

channel