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Specifying OC768-over-OC192 Mode

The T-series routing platforms support OC768-over-OC192 mode on the 4-port OC192c PIC. In OC768-over-OC192 mode, four OC192 links are aggregated into one OC768 link with one logical interface. This single interface achieves data rates of approximately 40 Gbps. OC768 optics are expensive, and most long-distance networks currently use fiber optics and regenerators that cannot carry OC768 SONET. When you create an OC768 pipe as a large data pipe running over existing infrastructures, you transfer network traffic without link bonding or load sharing over parallel links. Load sharing is automatically accomplished in the JUNOS software using a proprietary method, and does not need to be manually configured.

The following limitations apply to OC768-over-OC192 mode:

The maximum difference in delay between all links in the bundle is 8 µ (microseconds), equivalent to approximately 1.5 km maximum difference in length between the longest and shortest fiber pairs.
If a single link in the bundle fails, the whole bundle fails. If link redundancy is required, implement an aggregated SONET/SDH bundle instead.
Only routers that contain 4-port OC192 PICs can operate in OC768-over-OC192 mode.

To configure the 4-port OC192 PIC to operate in OC768-over-OC192 mode on a TX Matrix platform, include the aggregate-ports statement at the [edit chassis lcc lcc-number fpc slot-number pic pic-number] hierarchy level:



[edit chassis]
lcc lcc-number {


fpc slot-number {


pic pic-number {
aggregate-ports;
}


}


}
...

To configure the 4-port OC192 PIC to operate in OC768-over-OC192 mode on a T640 routing node, include the aggregate-ports statement at the [edit chassis fpc slot-number pic pic-number] hierarchy level:



[edit chassis]
fpc slot-number {


pic pic-number {
aggregate-ports;
}


}
...

When you configure the 4-port OC192 PIC for OC768-over-OC192 mode, only port 0 (the first port) needs be configured as the OC768 port.

To display logical and physical interface information, use the operational mode command show interfaces so-fpc/pic/port extensive. When this command is used for the 4-port OC192 PIC configured for OC768-over-OC192 mode, only port 0 (so-fpc/pic/0) is displayed. This port is displayed as OC768.

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