Nortel Networks OPTera Metro 3500 - Manual (Page 107)

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)