Cisco ASR 9000 Series Configuring page 3

Configuring Channelized SONET/SDH on the Cisco ASR 9000 Series Router
When a line is channelized, it is logically divided into smaller bandwidth channels called paths. These
paths carry the SONET payload. The sum of the bandwidth on all paths cannot exceed the line
bandwidth.
When a line is not channelized, it is called clear channel, and the full bandwidth of the line is dedicated
to a single channel that carries broadband services.
An STS stream can be channelized into the following types of channels:
T3/E3
•
VT1.5 mapped T1
•
• Packet over SONET/SDH (POS) (OC12 and OC48 only)
The T3/E3 channels can be channelized further into T1s, and the T1s can be channelized into time slots
(DS0s), except on the 1-Port Channelized OC-48/STM-16 SPA, which does not support T1 or DS0s.
Channelizing a SONET line consists of two primary processes:
• Configuring the controller
• Configuring the interface into channelized paths
You configure the controller first by setting the mode of the STS path. The mode can be set to T3, or
VT1.5-mapped T1, or POS, depending on your hardware support.
POS is supported only on the STS-3c and STS-12c paths on the Cisco 1-Port Channelized OC-12/DS0
Note
SPA and on the STS-3c, STS-12c, and STS-48c paths on the Cisco 1-Port Channelized OC-48/STM-16
SPA.
When the mode is specified, the respective controller is created, and the remainder of the configuration
is applied on that controller. For example, mode T3 creates a T3 controller. The T3 controller can then
be configured to a serial channel, or it can be further channelized to carry T1s, and those T1s can be
configured to serial interfaces.
Depending on the support for your installed SPA, each STS path can be independently configured into
T3s, E3s, or VTGs, and so on.
OL-26061-03
Cisco ASR 9000 Aggregation Services Router Interfaces and Hardware Component Configuration Guide
Information About Configuring Channelized SONET/SDH
HC-319