Configuring Channelized SONET/SDH on the Cisco ASR 9000 Series Router
Information About Configuring Channelized SONET/SDH
HC-324
Cisco ASR 9000 Aggregation Services Router Interfaces and Hardware Component Configuration Guide
OL-26061-03
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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