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Wednesday 4 January 2012

Nortel Passport


What Is Passport


High persormance backbone switch for building networks as well as for delivering high-speed access services that DPN switches do not currently support.
It is a member of Northern TElecom's Magellan family of switches.


Two available passport models are :


Model 160=16 processor cards
Model 50=5 processor cards


Both functions identical and run the same software but the difference between the two models is in the physical size and number of processor cards that each can contain.








Multiprocessor Architecture


Control Processor Cards= handles passport management functions
Functional Processor Cards= handles data path function/ Actual data tranfer


Passport's buss is cell based and fully redundant, comparising two load shared buses with an aggregate throughput of 1.6 Gbps.


Frames are converted to cells for transport over the bus and then reassembled into frames before leaving Passport.


This way it support both cells and frames. It has switching capacity of 80000dpps and switching delay of 125usec so much more powerful than DPN-100 switches.


Interface/trunk support


Passport supports V.35, E1, DS1, DS3. These interfaces are implemented on the Functional Processor(FP) cards.
Passport trunks support two different types of protocol
>UTP Protocol for Passport to DPN connection
>unacknowledge trunking protocol for Pasport to Passport connections.


Routing on Passport


>Connectionless routing=DPN and Frame Relay traffic
>PORS(Path oriented routing system)=access service i.e. voice, HDLC and Bit Transparent Data




Standard Peripheral Interfaces


Two types of Cards
>CP 
Provides control and management of the switch and FPs. It performs activities associated with the bus and non-real time tasks such as routing table maintenance. One CP is sufficent to handle one passport shelf but second CP can be used for security and redundancy and should be configured as standby. Standby takes over automatically.






>FP


Provides the physical interface for passport trunks or protocol services. It performs the real time processing and packet routing associated with interface type. It also connects the processor to the passport backplane providing an interface with the bus.




Supported Interface


8 port V.35
4 port DS1(T1) and E1
1 port DS1 and E1  Voice


Each one of these interface types can be used for trunking as well.




Access Services


FR UNI (user to Network) interface
FR NNI(Network to Network) interface
Voice Transport
HDLC Transparent Data
Bit Transparent Data
Passport and DPN 100 interworking.







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