Overview Of Sonet; Restrictions For Sonet - Cisco ASR 900 Series Configuration Manual

Overview of SONET

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Overview of SONET

SONET is a set of standards that define the rates and formats for optical networks specified in GR–253–CORE.
SONET is based on a structure that has a basic frame format and speed. The frame format used by SONET
is the Synchronous Transport Signal (STS), with STS-1 as the base-level signal at 51.84 Mbps. An STS-1
frame can be carried in an OC-1 signal.
SONET has a hierarchy of signaling speeds.

Restrictions for SONET

• Rate combinations are 0-1, 2-3, 4-5, 6-7 and 8. A maximum rate of 4XOC-48 is supported on ports 0-7.
• Only 16 BERT Patterns can be configured at a time on 1-Port OC192/STM-64 or 8-Port
• VT1.5 VT cannot be configured if VT1.5 T1/DS1 is configured with the same KLM value.
• PMON fields are not supported for VT1.5 VT and DS3 or T3.
• PMON Far-end parameters are not supported.
Restrictions on Bandwidth
• Total available bandwidth for 1-Port OC192/STM-64 or 8-Port OC3/12/48/STM-1/-4/-16 Module is
1-Port OC-192 or 8-Port Low Rate CEM Interface Module Configuration Guide, Cisco IOS XE Everest 16.7.x
(Cisco ASR 900 Series)
20
Associated Commands, page 64
Additional References for Configuring SONET on 1-Port OC192/STM-64 or 8-Port
OC3/12/48/STM-1/-4/-16 Interface Module, page 67
4XOC-48 can be configured in any one port of a port-group and other port is not used.
OC3/12/48/STM-1/-4/-16 Module.
10G.
The following configuration is blocked and an error message is displayed after the maximum bandwidth
is utilized:
rate OC3| OC12| OC48| OC192
The bandwidth of adjacent ports should not exceed OC-48.
The following table shows the bandwidth used by different rates:
Table 1: Bandwidth Used by Different Rates
Rate
OC-3
OC-12
OC-48
OC-192
Bandwidth
155.52 Mbps
622.08 Mbps
2.4 Gbps
9.6 Gbps
Configuring SONET