RAD Data comm LA-210 Manual de usuario descargar pdf (Pagina 2)

-210

EFM DSL Network Termination Unit

MARKET SEGMENTS AND

APPLICATIONS

LA-210 is suitable for incumbent carriers

employing a copper infrastructure to

deliver data services using DSL technology,

via extensive existing DSLAM deployments.

The ability to serve both as a DSL modem

and as an Ethernet demarcation point

makes LA-210 suitable for carriers that

want to deliver Ethernet services over

different infrastructures, such as DSL. The

22 Mbps bandwidth achieved using

LA-210 covers the customers that are not

yet served via fiber, but want to receive

Ethernet services at higher rates.

LA-210 is also suitable for

Tier 2/alternative carriers. With more and

more copper unbundling, this type of

customer wants to deliver Ethernet

services to their customer base. Once the

copper is unbundled, the DSL becomes

important for these operators as well.

Figure 1 and 2 illustrate typical

applications.

Ethernet Private Line for Site-to-Site

or LAN-to-LAN

Figure 1illustrates an example of a typical

application of Ethernet Private Line for

site-to-site or LAN-to-LAN connectivity.

Ethernet Virtual Private Line

Figure 2 illustrates an example of Ethernet

Virtual Private Line service where LA-210

supports several Ethernet Virtual

Connections (EVCs). This application can

be used to connect several branches to

the corporate headquarters. The branches

can be connected with LA-210 using a 2/4

SHDSL wire, while the headquarters is

connected with 8 SHDSL wires

(22.8 Mbps). The traffic from each branch

is encapsulated into EVCs, which reaches

the headquarter LA-210 and is handled

according to the EVC SLA parameters.

ETHERNET

LA-210 offers the following Ethernet

services:

• EPL – Site-to-site connectivity over

dedicated bandwidth without service

multiplexing

• EVPL – Site-to-site connectivity over

shared bandwidth with service

multiplexing (see Figure 2).

Flexible Traffic Mapping

Traffic is mapped to the Ethernet flows

(EVCs) using the following classification

criteria:

• Port-based (All-to-one bundling)

• CE-VLAN

• CE-VLAN priority

• CE-VLAN + CE-VLAN priority

• CE-VLAN + SP-VLAN

• CE-VLAN ID + IP precedence (user to

network only)

• CE-VLAN + DSCP (user to network

only).

More classification criteria and

combinations can be found in the user

manual.

LA-210 performs several per-flow VLAN

tagging actions, including adding and

removing VLAN tags.

Bridge Mode

The internal bridge operates in

VLAN-aware or VLAN-unaware mode. VLAN

stacking separates traffic between

different users or services. The traffic is

separated by assigning different VLAN IDs

to different services or users.

QoS and Traffic Prioritization

LA-210 prioritizes traffic and offers QoS

to ensure service level agreements (SLA)

that comply with business customers’ high

demands.

Traffic policing is applied per flow and

operates according to the dual token

bucket mechanism based on

user-configurable CIR + CBS and EIR + EBS.

User traffic is mapped into up to four

separate queues, which can be configured

to work as strict priority or weighted fair

queue (WFQ). The queues handle traffic

with different service demands, such as

real-time traffic, premium data, or best-

effort data.

Shaping can be performed at the network

queue and network port egress level.

Color-Aware P-Bit Re-Marking

The VLAN priority bit in Ethernet frames

can be modified at network ingress

according to the ‘color’ of the frame. This

allows service consistency and QoS

continuity across color-aware as well as

color-unaware networks.

OAM

End-to-end OAM based on IEEE 802.1ag

and ITU-T Y.1731 enables Ethernet service

providers to monitor their services

proactively, measure end-to-end

performance, and guarantee that the

customers receive the contracted SLA.

Fault monitoring and performance

measurement include frame delay, frame

delay variation, frame loss and availability.

Single segment (link) OAM according to

IEEE 802.3-2005 (formerly 802.3ah)

provides fault indication, including remote

loopback.

Layer-2 Control Processing

LA-210 can be configured to pass through

Layer-2 control frames across the

network, to peer-supported protocols

(802.3ah), or to discard the L2CP frames.

LAN

IP DSLAMIP DSLAM

SHDSL

EFM

PBX

Site A

LAN

PBX

Site B

SHDSL

EFM

ETH

PSN

LA-210 LA-210

Figure 1. Ethernet and TDM Services over SHDSL EFM

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