Cisco Cisco IOS Software Release 12.0(19)S
IP Services Engine Line Cards
Feature Overview
3
Cisco IOS Release 12.0(19)S
Channelized 16-port OC-3/STM-1
The channelized 16-port OC-3/STM-1 to DS-3/E3 line card supports both SONET and SDH framing and
provides DS-3/E3 aggregation for the Cisco 12000 series Internet router. For SDH, both AU-3 and AU-4
mappings are supported. The line card interfaces with the Cisco 12000 series Internet router switch
fabric and provides 16 OC-3/STM-1 duplex SC single-mode intermediate reach optical interfaces. Each
physical port can carry up to three channelized interfaces.
provides DS-3/E3 aggregation for the Cisco 12000 series Internet router. For SDH, both AU-3 and AU-4
mappings are supported. The line card interfaces with the Cisco 12000 series Internet router switch
fabric and provides 16 OC-3/STM-1 duplex SC single-mode intermediate reach optical interfaces. Each
physical port can carry up to three channelized interfaces.
For information regarding hardware installation and features, see the appropriate Cisco Systems
publications listed in
publications listed in
Channelization Support
This section describes the channel capacity and support for each of the ISE line cards. This section also
defines the channelization terms used in this document, and discusses the relationship between terms
used in SONET and SDH framing. A further description of the SDH STM hierarchy is also included.
defines the channelization terms used in this document, and discusses the relationship between terms
used in SONET and SDH framing. A further description of the SDH STM hierarchy is also included.
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Port Capacity for Channelized Line Cards
Each channelized ISE line card contains a number of ports that offer certain signal capacities per port.
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16-port OC-3/STM-1: 16 ports, each with a capacity of OC-3 or STM-1
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4-port OC-12/STM-4: 4 ports, each with a capacity of OC-12 or STM-4
Maximum Number of Channels per Port
Each port can be channelized into multiple interfaces using a portion of the port’s available bandwidth.
The smallest channel is OC-1, which is carried by an STS-1 signal for SONET framing, and a VC-3
signal for SDH framing.
The smallest channel is OC-1, which is carried by an STS-1 signal for SONET framing, and a VC-3
signal for SDH framing.
Therefore, the maximum number of STM-1/VC-3 channels per port for each ISE line card is:
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16-port OC-3/STM-1: a maximum of 3 channels per physical port
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4-port OC-12/STM-4: a maximum of 12 channels per physical port
In other words, the maximum channels per port = the maximum number of OC-1s/STS-1s/VC-3s for
each port.
each port.
shows how the optical carrier signal levels relate to the SONET and SDH framing signals. This
table also shows the signal rates of these signals and the maximum number of serial interfaces that can
be carried by the SONET/SDH signals.
be carried by the SONET/SDH signals.
Table 1
OC-n and SONET/SDH Signal Capacities
Optical Carrier Signal
SONET Signal
(North America)
SDH Signal
(Europe)
Signal Bit Rate
Serial Line Capacity
OC-1
STS-1
VC-3
51.84 Mbps
1 x DS-3/E3s
OC-3
STS-3
STM-1
155.52 Mbps
3 x DS-3/E3s
OC-12
STS-12
STM-4
622.08 Mbps
12 x DS-3/E3s