Bridge control protocol, Network protection using upsr, 1+1 linear and blsr – Nortel Networks OPTera Metro 3500 User Manual

Page 107

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Operation, administration, and maintenance (OAM) features 2-69

Planning and Ordering Guide—Part 1 of 2 NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004

Figure 2-35
2x100BT-P2P logical datapath overview

Bridge Control Protocol

The Bridge Control Protocol (BCP) is negotiated when packets for transport
are Ethernet. BCP is responsible for configuring, enabling and disabling the
bridge protocol modules on both ends of the link. Negotiation of BCP will not
start until LCP negotiation has been completed and the NCP negotiation phase
has been reached.

Network protection using UPSR, 1+1 linear and BLSR

Bandwidth management refers to the method in which the signal from the
100BT-P2P card interfaces with the OPTera Metro 3500 SONET paths.
Generally an STS connection is formed between the 2x100BT-P2P circuit
pack and another circuit pack on the shelf.

Ingress

SONET

HDLC

PPP

BCP

MAC

PHY

STS1/3c

10/100BT

Egress

Flag Add Ctrl Proto

PPP Payload

FCS Flag

Flags MAC type

Data

Data

FCS

DA SA T/L

FCS

Data

DA SA T/L

Preamble SFD

PPP Frame

BCP Frame

Ethernet Frame

(1)

(1)

(1)

(1)

(1)

(1)

(1)

(2)

(2)

(2)

(4)

(4)

(4)

(6)

(6)

(6)

(6)

(7)

(<1592)

(64..1590)

(46..1576)

(46..1576)

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