Information Technology Reference
In-Depth Information
SONET/SDH guarantees bandwidth and has line rates of 155 Mbps to more than 10 Gbps.
Common circuit sizes are OC-3, or 155 Mbps, and OC-12, or 622 Mbps.
SONET/SDH uses a ring topology by connecting sites and providing automatic recovery
capabilities and has self-healing mechanisms. SONET/SDH rings support ATM or Packet
over SONET (POS) IP encapsulations. The Optical Carrier (OC) rates are the digital band-
width hierarchies that are part of the SONET/SDH standards. The optical carrier speeds
supported are as follows:
OC-1 = 51.85 Mbps
OC-3 = 155.52 Mbps
OC-12 = 622.08 Mbps
OC-24 = 1.244 Gbps
OC-48 = 2.488 Gbps
OC-192 = 9.952 Gbps
OC-255 = 13.21 Gbps
Figure 6-5 shows an OC-48 SONET ring with connections to three sites that share the ring.
Headquarters
Cisco ONS
15454
OC-48 SONET RING
Remote
Campus
North
Remote
Campus
South
802.1Q
Trunk
Figure 6-5
SONET/SDH
 
 
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