1660

TECHNICAL INFORMATION GUIDE

Alcatel Optical Multi-Service Nodes

ISA Ethernet 10/100/1000 Access modules

Enabling advanced Metro Ethernet Services over Next Generation SDH

Introduction This Technical Information Guide describes architecture and applications of ISA

(Integrated Service Adapter) Ethernet and Gigabit Ethernet Access plug in boards.

Alcatel ISA Ethernet 10/100/1000 Access modules were conceived as add-on modules for

the Alcatel Optical Multi-Service Nodes (OMSN) product family the Alcatels next-

generation SDH systems.

ISA Ethernet Access modules provide comprehensive interfacing, mapping and

transport features that enable Ethernet and Gigabit Ethernet services delivery over the

public transport network.

ISA Ethernet Access modules, together with ISA Packet Ring layer 2 switching

modules, realize the OMSN Metro Ethernet Solution.

ISA Ethernet Access modules are:

> ISA-Eth

o Ethernet 10/100 rate-adaptive transport, with provisionable WAN

bandwidth

> ISA-GbE

o Gigabit Ethernet rate-adaptive transport, with provisionable WAN

bandwidth

ISA Ethernet 10/100/1000 Access modules together with ISA Packet Ring empower

OMSN portfolio to offer telecom carriers and service providers be established on new

entrants - the powerful solution to build IP-enabled optical networks.

OMSNs integrated TDM and Packet capabilities enable Service Providers to achieve

the optimal balance between new competitive service offerings and traditional revenue-

generating services.

By only incremental investments OMSN enhance transport networks with new data

service support functions to augment overall network utility. World-class Metro

Ethernet service delivery can be therefore realized by leveraging on the existing

dominant SDH transport infrastructure at minimal

cost..

Table Of Contents

ISA-Eth module ...............................................................................................................4 General Description......................................................................................................4 Architecture..................................................................................................................4 Management.................................................................................................................3 Protections: Dual homing .............................................................................................3 Equipment Engineering:...............................................................................................3 ISA-Eth module usage in 1660 SM...............................................................................3 ISA-Eth module usage in 1650 SMC.............................................................................4 ISA-Eth module usage in 1640 FOX.............................................................................4

ISA-GbE Module ..............................................................................................................5 General Description......................................................................................................5 Architecture..................................................................................................................6 Figure 13 ISA-GbE Architecture..........................................................................6 Traffic provisioning.......................................................................................................6 Equipment Engineering:...............................................................................................7 ISA-GbE module usage in 1660 SM and 1670 SM ........................................................7 ISA-GbE module usage in 1650 SMC ...........................................................................7 ISA-GbE module usage in 1640 FOX............................................................................8

ISA-Eth module

General Description

ISA Ethernet module provides 10/100baseT interfaces

allowing the interconnection of two LANs in a point to

point configuration. The cards act as a gateway towards

the SDH network. This point-to-point connectivity is ,

today, fairly effective to cover Ethernet MAN applications

from the service point of view such as transparent LAN

services and Internet access.-

Service Level Agreement proposed through this approach

is equivalent to the well known SDH leased line concept.

The principle of the leased line guarantees a dedicated

and independent path for every service, which can be

protected or unprotected, but anyway monitored within

the usual management capability of a transmission

network; those services are intrinsically segregated by the

usage of the transport network resources (Figure 1).

Figure 1: Metro Ethernet Access in OMSN with ISA-Eth

The major benefits that can be experienced utilizing ISA

Ethernet card in the SDH networks are:

> Interfaces cost reduction;

> Bandwidth shaping according to clients needs.

The interface cost reduction is achieved thanks to the

native interfaces provided on the board that allow to

replace the expensive up-link ports, which use the POS

(Packet Over SDH/SONET), traditionally. This leads to

an infrastructures optimization of the operator and cost

reduction for the end-user.

The bandwidth can be allocated to the end users in

accordance with the real need, independently from the

interface type. Furthermore the operators are enabled to

offer more services with enhanced flexibility and

granularity, optimizing the bandwidth through the SDH

network.

Architecture

Figure 2: ISA-Eth main board

Ethernet frames are mapped over SDH VC using Generic

Framing Procedure (GFP) encapsulation (ITU-T G. 7041).

All the Ethernet access connectors are on the front panel

of the unit (Fig 2).

ISP Router

LAN to LAN connection

Internet Access

Internet Access

Ethernet frames mapped in SDH VC

TECHNICAL INFORMATION GUIDE ALCATEL 2 >

Alcatel Optical Multi-Service Nodes ISA Ethernet 10/100/1000 Access modules

The architecture of the board is represented in Figure 3.

It is based on two cards:

> access card that provides 14 Ethernet interfaces 10BaseT or 100BaseT,

> main board that provides 11 Ethernet interfaces 10BaseT or 100BaseT.

The Ethernet traffic, opportunely mapped in the SDH

transport structures, is then sent toward the SDH matrix

from the backplane with 4 STM1 equivalent

throughput.

The unit is able to execute a rate-adapting action, hence it

is able to crossconnect a 10/100Mbit/s Ethernet stream

into an SDH virtual container of any dimension (VC12,

VC3, VC4).

Data transfer rate from Customer equipment is limited in

accordance with SDH capacity by the 802.3x flow control

mechanism.

The flow control mechanism is used to prevent the

congestion of the transmission network that may cause

packet discarding. When the buffer memory dedicated to

a certain service is overloaded by an Ethernet frames

peak exceeding the nominal bit rate specified by the SLA,

the flow control mechanism ( IEEE 802.3x) stops the

client source until the bandwidth allocated to the service

is able to absorb the extra traffic. The result is that no

packets are lost even in case of congestion.

The OSI stack relationship and Ethernet frame

encapsulation are shown in figure 4.

Figure 4: GFP mapping

The Ethernet frames received through the native

interfaces are mapped using the GFP protocol into the

SDH VC-x and then transmitted through the SDH. At the

sink Ethernet frames are recovered and then directed

toward the relevant interfaces. Full transparency with

respect of the upper layer protocols is maintained.

SDH bandwidth allocation can be managed following two

approach:

> Each Ethernet interface is independently mapped into 1xVC12/VC3/VC4. The container is then

cross-connected in the matrix as any other VC

tributary.

> Each Ethernet interface can be mapped as N x VC12/VC3 through the usage of packet

concatenation. Each VC runs independently

inside the SDH network; for each of these VC a

dedicated cross-connection is required inside the

matrix. Thanks to the information contained into

the GFP Header the frames are re-aligned at the

sink side.

Figure 3: ISA-Eth architecture

SSDDHH PPOORRTT SSDDHH PPOORRTT

ISA Eth Port

Module 11 x I/F

ISA Eth Access Module 14 x I/F

SSTTMM--NN RX

TX

TX

RX SSTTMM--NN

SSDDHH

SDH Xconnection

SDH VC

Backplane bus

connection

ISA EthPort

Module11 x I/F

ISA EthAccessModule14 x I/F

IPv4 IPv6 IPX MPLS

Transparency to all upper layer protocols

Ethernet

PHYGFP

SDH

SDH Payload

Ethernet FrameGFP Ethernet Frame

Ethernet I/F

STM - n I/F



Management

The Ethernet port, being part of OSMN portfolio is fully

managed by Alcatel Network Management System.

Figure 5: Ethernet port management in OMSN

Protections: Dual homing

In case of failure of either LAN-to-LAN Board or Access

Board the Service Protection can be guaranteed by a dual

homing connection between the LAN Switch and the

OMSN.

The L2/L3 customer equipments are connected to OMSNs

using two separate ISA Ethernet ports and the Ethernet

traffic is transported through the SDH network utilizing

2 different paths..

In case of failure the L2 and L3 equipment switch the

Ethernet traffic to the second ISA Ethernet port.

SDH

Figure 6 Dual homing protection

Of course the SDH pipe transporting Ethernet frames can

be protected through usual mechanisms provided by SDH

network

Equipment Engineering:

This following chapter describes the ISA-Ethernet card

traffic and OMSN implementation engineering rules.

Figure 7: ISA-Eth, GbE and Packet Ring in OMSN

ISA-Eth module usage in 1660 SM

> ISA-Eth main board: 1 slot in lower shelf area (11 x Ethernet ports)

> ISA-Eth access board: 1 slot in upper shelf area (14 x Eth ports) to improve port density.

> ISA-Eth can be housed in any Port slot.

> Up to 400 Ethernet interfaces per shelf



Figure 8: Alcatel 1660 SM with ISA-Eth

ISA-Eth module usage in 1650 SMC


> ISA-Eth access board: 1 slot in upper shelf area (14 x GE ports) to improve port density.

> ISA-Eth can be housed in any Port slot.

> Up to 75 Ethernet interfaces per shelf.

Figure 9: Alcatel 1650 SMC with ISA-Eth

ISA-Eth module usage in 1640 FOX


> ISA-Eth Access Board cannot be housed in 1640 FOX.

> Up to 22 Ethernet 10/100 interfaces

Figure 10: Alcatel 1640 FOX and ISA-Eth

.

ISA-Eth main board

ISA-Eth

access board



ISA-GbE Module

General Description

ISA Gigabit Ethernet provides 1000BaseSX/1000BaseLX

interfaces in OMSN family allowing the interconnection

of two LANs in a point to point configuration as Figure

11.

The card acts as a gateway towards the SDH network.

Figure 11 - Gigabit-Ethernet Link over SDH

The card allows to realize the following connections in the

SDH Network:

> Transport of a Gigabit Ethernet signal between two data equipment A and D

> Guaranteed QoS between end points over the network.

> GE signal between A and B and between C and D is transported over standard link (i.e.

1000BaseLX or 1000BaseSX fibres)

> the edge nodes map, using a dedicated method, the GE signal to a VC4-xv (with virtual

concatenation)

> the GE signal is transparently transported by the SDH/SONET network between OMSNs B and C,

using the VC4-xv trail

These features comply with the following standards:

> IEEE 802.3z (gigabit interfaces)

> ITU G.707 and G.783 (including virtual concatenation)

The traffic received by the 1000baseSX or 1000baseLX

Ethernet interfaces on the ISA-GbE card is mapped into a

number of VC-4 SDH containers, more precisely the Giga-

Ethernet traffic passing trough 1 x GigabitEthernet

physical interface is mapped into a specific VC-4-xv

(x=12,3,4,5,6,7) structure using the standard virtual

concatenation.

Each Gigabit Ethernet frame is mapped without

modifications into a generic framing procedure frame

(GFP-ITU-T G.7041).

Such GFP frame is afterwards mapped inside the specific

VC-4-xv according to SDH standard protocol stack.

In fact the Gigabit Ethernet traffic is transported

transparently by the SDH Network and the ISA Gigabit-

Ethernet card inside an OMSN extracts and receives the

Gigabit-Ethernet traffic coming from LAN switches or

routers without "terminating" the Gigabit-Ethernet

frames.

Full rate Gigabit-Ethernet is transported in VC-4-7v and

minimum rate Gigabit- Ethernet in single VC-4.

ISA-GbE GFP standard mapping introduces the rate

adaptation feature in the traffic flow, while taking into

account the bursty profile of the Gigabit-Ethernet traffic.

The rate adaptation relies on the introduction of a buffer

that acts as a bucket which smoothes the bursty Ethernet

traffic.

The peak rate that the card is able to adsorb without

discarding any Ethernet packet/frame is directly

proportional to the bucket "depth".

In practice no discarding can be achieved because the ISA

Gigabit-Ethernet card features the mechanism of traffic

Flow control specified in IEE 802.3x.

SDH NE SDH NE A A B B CC D D SDH/SONET Network

1000BaseSX or 1000BaseLX

1000BaseSX or1000BaseLX

Backbone Network Domain

Site POP SDH/SONET

WDM Network

Customer Site

CustomerSite

Customer Network Domain

Optical Link



Thanks to this control, when the buffer reaches a fixed

threshold a particular frame is generated communicating

to the source (i.e. LAN switch or router) to stop its

transmission for a certain time period (specified in this

frame). In this way frame discarding is avoided.

Figure 12 - Rate adaptation and buffering

Architecture

The architecture of the ISA Gigabit-Ethernet card is

represented in . ISA Gigabit-Ethernet is made of two

cards :

> Main board: card providing hw intelligence and 4 Ethernet 1000BaseSX/LX interfaces

> Access-card: expands the number of 1000 BaseSX/LX ports of the main card with 4

additional 1000 BaseSX/LX interfaces

The Gigabit-Ethernet traffic, specially mapped in the

SDH transport structures, is transmitted from the ISA

Gigabit-Ethernet plug in module toward the SDH matrix

through the back plane (which has 8 x VC-4 equivalent

throughput), then the SDH matrixes connects each VC-4

with the appropriates STM-n port card to the WAN

transmission side.

The bandwidth associated to each 1000BaseSX/LX

interfaces is such that the 8 interfaces within a single slot

ISA Ethernet plug in module, considered all together,

cannot transport more than 8 x VC-4 payload equivalent

bandwidth.

Figure 13 ISA-GbE Architecture

Traffic provisioning

The operator provisioning main options are:

> 1000 BaseSX/LX interface traffic mapped into:

o 1 x GbEGFPVC-4-7v

o 1 x GbEGFPVC-4-6v

o 1 x GbEGFPVC-4-5v

o 1 x GbEGFPVC-4-4v

o 1 x GbEGFPVC-4-3v

o 1 x GbEGFPVC-4-2v

o 1 x GbEGFPVC-4.

The operator will always have to provision for each 1000

BaseSX/LX interface:

> Type of interface : 1000Base SX or 1000Base LX by using of SFP (Small Form Factor Pluggable

with LC connectors), the possibility to mix

1000baseSX and LX interfaces on the same card

(acces card or port card ) is allowed.

> Mapping in SDH resources (see above)

> IEEE 802.3x Flow control activation

Always considering that the back panel is able support a

maximum throughput of 8 x VC-4.

1250 Mb/s GE

SDH VC-4-XV

Configurabl

GbEPort Module

4 x I/F

GbE AccessModule4 x I/F

GbEPort Module

4 x I/F


GbEPort Module

4 x I/F


GbEPort Module

4 x I/F


SDH PORTSDH PORT

STM-N

STM-N

RX

TX

TX RX

SDH PORT SDH PORT

STM-NSTM-N

SDH MATRIX SDH MATRIX

SDHXconnectio

SDH VC

Backplanbus

connection

Ethernet Ethernet GFP GFP SDH SDH

Protocol stack Protocol stack



Equipment Engineering:

This following chapter describes the ISA Gigabit-Ethernet

card traffic and OMSN implementation engineering rules

.

Figure 14: ISA-GbE ports in OMSN: SFP modules

Gigabit-Ethernet port card can accepted up to 4 1000Base

SX/LX interfaces SFP

> Gigabit-Ethernet acces card can accepted up to 4 1000 BaseSX/LX interfaces SFP

> Only one Access Card can be connected to a ISA GbEth Port Card

> Gigabit-Ethernet port card can be in any Port Slot of the OMSNs.

ISA-GbE module usage in 1660 SM and 1670 SM

> ISA-GbE main board: 1 slot in lower shelf area (4 x GE ports); ISA-GbE access board: 1 slot in upper

shelf area (4 x GE ports) to improve port density.

> ISA-GbE can be housed in any Port slot.

> Up to 96 Gigabit-Ethernet interfaces per shelf

ISA-GbE module usage in 1650 SMC

> ISA-GbE main board: 1 slot in righ shelf area (4 x GE ports); ISA-GbE access board: 1 slot in left

shelf area (4 x GE ports) to improve port density

> The ISA GbE card can be housed in any Port slot.

> Up to 24 Gigabit-Ethernet interfaces

ISA-GbE main board

ISA-GbE access board

Figure 15: Alcatel 1670 SM and ISA-GbE

1650 SMC

Available slots Port Card

Access Card



ISA-GbE module usage in 1640 FOX

> ISA-GbE main board: 1 slot in lower shelf area (4 x GE ports);.

> Access Board cannot be housed in 1640 FOX.

> Up to 8 Gigabit-Ethernet interfaces

Available slots

1640 FOX

Port Card

Alcatel and the Alcatel logo are registered trademarks of Alcatel. All other

trademarks are the property of their respective owners. Alcatel assumes

no responsibility for the accuracy of the information presented, which is

subject to change without notice.

10 2002 Alcatel. All rights reserved.

3AL XXXXX AAAA Ed. 01

1660

Documents

isa ethernet access

alcatel isa ethernet

isaeth o ethernet

isagbe module

isaeth module usage

gigabit ethernet access

omsn metro ethernet

isa packet ring layer