Cisco ASR 9000 Series User manual

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Cisco ASR 9000 Aggregation Services Router Interfaces and Hardware Component Configuration Guide
OL-26061-03
Configuring Channelized SONET/SDH on the
Cisco ASR 9000 Series Router
This module describes the configuration of Channelized SONET/SDH on the Cisco ASR 9000 Series
Aggregation Services Routers.
Feature History for Configuring Channelized SONET/SDH on Cisco IOS XR Software
Contents
•Prerequisites for Configuring Channelized SONET/SDH, page 317
•Information About Configuring Channelized SONET/SDH, page 318
•How to Configure Channelized SONET/SDH, page 327
•Configuration Examples for Channelized SONET, page 354
Prerequisites for Configuring Channelized SONET/SDH
You must be in a user group associated with a task group that includes the proper task IDs. The command
reference guides include the task IDs required for each command. If you suspect user group assignment
is preventing you from using a command, contact your AAA administrator for assistance.
Release Modification
Release 3.9.0 Support for the following SPA was introduced on the
Cisco ASR 9000 Series Router:
•Cisco 2-Port Channelized OC-12/DS0 SPA
Release 4.0.0 Support for the following SPA was introduced on the
Cisco ASR 9000 Series Router:
•Cisco 1-Port Channelized OC-48/STM-16 SPA
Support for SDH, E3, E1, and POS channelization was added for the
Cisco 2-Port Channelized OC-12/DS0 and Cisco 1-Port Channelized
OC-48/STM-16 SPAs.
Release 4.0.1 Support for the following SPA was introduced on the
Cisco ASR 9000 Series Router:
•Cisco 1-Port Channelized OC-3/STM-1 SPA

Configuring Channelized SONET/SDH on the Cisco ASR 9000 Series Router
Information About Configuring Channelized SONET/SDH
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Before configuring Channelized SONET/SDH, be sure that the following tasks and conditions are met:
•You have at least one of the following SPAs installed in your chassis:
– Cisco 1-Port Channelized OC-3/STM-1 SPA
– Cisco 2-Port Channelized OC-12c/DS0 SPA
– Cisco 1-Port Channelized OC-48/STM-16 SPA
•You should know how to apply and specify the SONET controller name and interface-path-id with
the generalized notation rack/slot/module/port. The SONET controller name and interface-path-id
are required with the controller sonet command.
Information About Configuring Channelized SONET/SDH
To configure Channelized SONET/SDH, you must understand the following concepts:
•Channelized SONET Overview, page 318
•Channelized SDH Overview, page 323
•Default Configuration Values for Channelized SONET/SDH, page 326
•How to Configure Channelized SONET/SDH, page 327
Channelized SONET Overview
Synchronous Optical Network (SONET) is an American National Standards Institute (ANSI)
specification format used in transporting digital telecommunications services over optical fiber.
Synchronous Digital Hierarchy (SDH) is the international equivalent of SONET.
Channelized SONET provides the ability to transport SONET frames across multiplexed T3/E3 and
virtual tributary group (VTG) channels.
Channelized SONET is supported on the following SPAs:
•Cisco 1-Port Channelized OC-48/STM-16 SPA
•Cisco 1-Port Channelized OC-3/STM-1 SPA
•Cisco 2-Port Channelized OC-12c/DS0 SPA
Channelized SDH is supported on the following SPAs:
•Cisco 1-Port Channelized OC-48/STM-16 SPA
•Cisco 1-Port Channelized OC-3/STM-1 SPA
•Cisco 2-Port Channelized OC-12c/DS0 SPA
SONET uses Synchronous Transport Signal (STS) framing. An STS is the electrical equivalent to an
optical carrier 1 (OC-1).
SDH uses Synchronous Transport Mode (STM) framing. An STM-1 is the electrical equivalent to 3
optical carrier 1s (OC-1s).
A channelized SONET interface is a composite of STS streams, which are maintained as independent
frames with unique payload pointers. The frames are multiplexed before transmission.

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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.
Note POS is supported only on the STS-3c and STS-12c paths on the Cisco 1-Port Channelized OC-12/DS0
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.

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Figure 22 shows an example of three STS paths for a SONET controller. However, the 2-Port
Channelized OC-12/DS0 SPA supports up to 12 STS paths, and the 1-Port Channelized OC-48/STM-16
SPA supports up to 48 STS paths, but the 1-Port Channelized OC-48/STM-16 SPA does not support
VTGs.
Figure 22 SONET Controller STS Paths
STS 3
SONET
Controller
. . . can be configured as T3s or VTGs
STS 2 . . . can be configured as T3s or VTGs
STS 1 . . . can be configured as T3s or VTGs
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Figure 23 shows an example of some SONET controller configuration combinations.
Note The 1-Port Channelized OC-48/STM-16 SPA on the Cisco ASR 9000 Series Router does not support
VTGs.
Figure 23 SONET Controller Configuration Combinations
STS 3
SONET
Controller
STS 2
STS 1
Clear Channel
T3
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VTG 1
VTG 2
VTG 3
VTG 4
VTG 5
VTG 6
VTG 7

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Figure 24 shows the T3 paths that can be configured.
Note Channelized T3 paths are only supported on the 1-Port Channelized OC-3/STM-1 SPA and 2-Port
Channelized OC-12c/DS0 SPA.
Figure 24 SONET T3 Channelized Paths
STS 3
SONET
Controller
. . . same possibilities as STS 1
STS 2 . . . same possibilities as STS 1
STS 1
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DS0
DS0
DS0
DS0
DS0
DS0
DS0
DS0
DS0
. . . up to 24 DS0s
T1
T1
T1
T1
T1
T1
T1
T1
T1
T3
T3
T3
. . . up to 28 T1s
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .

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Figure 25 shows the VTG paths that can be configured.
Note VTG paths are only supported on the Cisco 1-Port Channelized OC-3/STM-1 SPA and Cisco 2-Port
Channelized OC-12c/DS0 SPA on the Cisco ASR 9000 Series Router.
Figure 25 SONET VTG Channelized Paths
Channelized SDH Overview
Synchronous Digital Hierarchy (SDH) is the international equivalent of SONET.
Channelized SDH is supported on the following SPAs:
•Cisco 1-Port Channelized OC-48/STM-16 SPA
•Cisco 1-Port Channelized OC-3/STM-1 SPA
•Cisco 2-Port Channelized OC-12/DS0 SPA
A Synchronous Transport Module (STM) signal is the Synchronous Digital Hierarchy (SDH) equivalent
of the SONET STS, but the numbers are different for each bandwidth. In this guide, the STM term refers
to both path widths and optical line rates. The paths within an STM signals are called administrative
units (AUs).
A summary of the basic terminology differences between SONET and SDH is as follows:
•SONET STS is equivalent to SDH administrative unit (AU)
•SONET VT is equivalent to SDH tributary unit (TU)
•SDH basic building blocks are STM-1 (equivalent to STS-3) and STM-0 (equivalent to STS-1)
STS 3
SONET
Controller
. . . same configuration possibilities as STS 1
STS 2 . . . same configuration possibilities as STS 1
STS 1
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VTG 1
VTG 2
VTG 3
VTG 4
VTG 5
VTG 6
VTG 7
T1
T1
T1
T1
Each STS
can be channelized
into 7 VTGs.
Each VTG
can be channelized
into 4 T1s.

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An administrative unit (AU) is the information structure that provides adaptation between the
higher-order path layer and the multiplex section layer. It consists of an information payload (the
higher-order virtual container) and an administrative unit pointer, which indicates the offset of the
payload frame start relative to the multiplex section frame start.
An AU can be channelized into tributary units (TUs) and tributary unit groups (TUGs).
An administrative unit 4 (AU-4) consists of three STM-1s or an STM-3.
An administrative unit 3 (AU-3) consists of one STM-1.
An administrative unit group (AUG) consists of one or more administrative units occupying fixed,
defined positions in an STM payload.
On the Cisco ASR 9000 Series Router, the following levels of SDH channelization are supported:
•1-Port Channelized OC-3/STM-1 SPA
– AU4 to TUG-3 to TUG-2 to VC-12 to E1 to NxDS0
– AU4 to TUG-3 to VC-3 to DS3 (Clear Channel)
– AU4 to TUG-3 to VC-3 to E3 (Clear Channel)
– AU3 to TUG-2 to VC-11 to DS1 to NxDS0
•2-Port Channelized OC-12/DS0 SPA
– AU-4-4c (VC-4-4c)
– AU-4 (VC-4)
– AU-4 to TUG-3 to VC-3 to DS3
– AU-4 to TUG-3 to VC-3 to E3
– AU-4 to TUG-3 to TUG-2 to VC-11 to T1 to NxDS0
– AU-4 to TUG-3 to TUG-2 to VC-12 to E1to NxDS0
– AU-3 to VC-3 to DS3
– AU-3 to TUG-2 to VC-11 to T1 to NxDS0
– AU-3 to TUG-2 to VC-12 to E1to NxDS0
– AU-3 to VC-3 to E3
– AU-3 to VC-3 to DS3 to T1 to NxDS0
Table 2 SONET and SDH Terminology Equivalencies
SONET Term SDH Term
SONET SDH
STS-3c AU-4
STS-1 AU-3
VT TU
SPE VC
Section Regenerator Section
Line Multiplex Section
Path Path

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– AU-3 to VC-3 to DS3 to E1 to NxDS0
•1-Port Channelized OC-48/STM-16 SPA
– DS3
– E3
– AU-3 (VC-3)
– AU-4 (VC-4)
– AU-4-4c (VC-4-4c)
– AU-4-16c (VC-4-16c)
Figure 26 shows an example of SDH AU-3 paths that can be configured on certain supported SPAs.
Note The 1-Port Channelized OC-48/STM-16 SPA does not support further channelization of AU-3 paths into
T1s.
Figure 26 SDH AU3 Paths
SONET
Controller
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C11-T1
T1
AU-3
C11-T1
T1
AU-3
C11-T1
T1
AU-3
STM-1

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Figure 27 shows the SDH AU4 paths that can be configured on supported SPAs.
Note The 1-Port Channelized OC-48/STM-16 SPA only supports channelization to the T3 or E3 level. Further
channelization of AU-4 paths is not supported.
Figure 27 SDH AU4 Paths
Default Configuration Values for Channelized SONET/SDH
Table 3 describes the default configuration parameters that are present on the Channelized SONET/SDH.
SONET
Controller
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TUG-3
T3
or C12
AU-4
STM-1
E1
E1
E1
E1
E1
E1
E1
E1
E1
E1
Up to 21 E1s
Table 3 SONET/SDH Controller Default Cit onfiguration Values
Parameter Default Value Configuration File Entry
Clock source line clock source {internal | line}
SONET framing sonet framing {sdh | sonet}