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The Alcatel-Lucent 7705 SAR supports

RFC 5086 — Structure-Aware TDM

Circuit Emulation Service over Packet

Switched Network (CESoPSN) and also

RFC 4553 — Structure-Agnostic TDM

over Packet (SAToP) for the encapsulation

and transport of TDM trafﬁc; for

example, from mobile 2G, TDM-attached

base stations. The use of circuit

emulation service (CES) ensures that

only the active time slots are trans-

ported, keeping bandwidth usage to

a minimum. Also, the Alcatel-Lucent

7705 SAR supports RFC 4717 — Encap-

sulation Methods for Transport of ATM

over MPLS networks; N:1 cell mode is

supported. Multiple access ATM ports

are bundled together to attain higher

speeds using IMA. The IMA protocol is

terminated on the Alcatel-Lucent 7705 SAR,

and only the cells containing user data

that belong to a virtual circuit/virtual

path (VC/VP) structure are trans-

ported. RFC 4448 — Encapsulation

Methods for Transport of Ethernet

over MPLS Networks is also supported.

To offer greater scalability, all the

trafﬁc out of an Ethernet port can

becarried over a single Ethernet

pseudowire or, alternatively, apseudo-

wire can be created for each VLAN

that is assigned to a different service

or end customer. IP pseudowires are

supported and provide the ability

to deterministically carry IP trafﬁc

between disparate media. For example,

IP trafﬁc can be carried between a

Point-to-Point Protocol (PPP) (or

Multi-Link Point-to-Point Protocol

(MLPPP)) access and an Ethernet

connection. The 7705 SAR product line

supports Border Gateway Protocol

(BGP)/MPLS Virtual Private Networks

(VPNs) to allow the separation of Layer 3

trafﬁc between different groups of

users or organizations. Virtual Private

LAN Service (VPLS) is supported for the

delivery of Layer 2 VPNs. Analog voice

encoding and transport is available on

the 7705 SAR-8 and the 7705 SAR-18.

Voiceband analog trafﬁc can be carried

over a modern network infrastructure

between two analog devices using either

traditional T1/E1 network interfaces or

over Ethernet or MLPPP interfaces.

Highly ﬂexible network infrastructure

options include the use of MPLS, IP or

GRE(Generic Routing Encapsulation)

tunneling for aggregated trafﬁc. When

dynamic MPLS signaling is deployed,

the end-to-end pseudowire is estab-

lished using targeted label distribution

protocol (T-LDP) and the MPLS tunnel

using LDP. In addition to efﬁcient

LDP-based dynamic signaling, static

provisioning of both the MPLS tunnel

and the pseudowire is supported.

GRE or IP tunneling allows low-cost,

ubiquitous IP networks to be used

forbackhauling; for example, for the

transport of HSPA (High Speed Packet

Access) off-loaded trafﬁc using DSL

access media.

Label switched routing

The 7705 SAR can be conﬁgured as

either a Label Edge Router (LER) or

a full Label Switched Router (LSR).

Label Switched Paths (LSPs) can be

signaled using either the Label

Distribution Protocol (LDP) or the

Resource Reservation Protocol with

Trafﬁc Engineering (RSVP-TE). The

7705 SAR brings a strong suite of

trafﬁc engineering and resiliency

capabilities using functions such as

Constraint-based Shortest Path First

(CSPF) routing, Fast Reroute (FRR),

primary and secondary LSPs and

redundant pseudowires.

Quality of service and

trafﬁc management

It is critical to maintain the end-to-end

quality of service (QoS) for packet

trafﬁc. Not all types of trafﬁc have the

same set of requirements. Voice trafﬁc

in particular requires low latency and

jitter (latency variation) as well as low

loss, whereas data trafﬁc often has less

stringent delay requirements but may

be very sensitive to loss, as packet loss

can seriously constrain application

throughput. To offer the required

treatment throughout the network,

trafﬁc ﬂows with different require-

ments are identiﬁed at the access and

marked in-line with the appropriate

QoS metrics. Trafﬁc classiﬁcation and

marking are carried out based on the

following categories:

Classiﬁcation (Layer 1/Layer 2/Layer 2.5

and/or Layer 3 header):

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nrt-VBR/UBR)

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Marking:

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and PWE3

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The Alcatel-Lucent 7705 SAR utilizes

extensive trafﬁc management policies to

ensure fairness with detailed classiﬁcation

and hierarchical scheduling including:

minimum/maximum, queue type-based

weighted round robin or strict priority

and proﬁled scheduling, as well as

multi-tier policing to differentiate and

prioritize individual services and ﬂows.

Operations, administration

and maintenance

In order to ensure continuity of services,

the Alcatel-Lucent 7705 SAR has a full

set of operations, administration and

maintenance (OAM) features including:

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¬ Veriﬁes, for example, tunnel con-

nectivity and round-trip delay

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(VCCV)

¬ Veriﬁes, for example, service level

existence and round-trip time

¬ Extends OAM to pseudowire

services

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¬ 802.3ah: Ethernet in the First Mile

¬ 802.1ag: Connectivity Fault

Management

¬ Y.1731: Ethernet OAM mechanisms

for fault management — mainly

at a service level

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