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For more information about configuring dial-in, see "Configuring Dial-In and Callback"
on page 884.
Specifying OC768-over-OC192 Mode
The T Series routers 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:
To configure the 4-port OC192 PIC to operate in OC768-over-OC192 mode on a TX
Matrix router, include the
fpc slot-number pic pic-number]
To configure the 4-port OC192 PIC to operate in OC768-over-OC192 mode on a T640
router, include the
pic-number]
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.
aggregate-ports
[edit chassis]
lcc lcc-number {
fpc slot-number {
pic pic-number {
aggregate-ports;
}
}
}
...
aggregate-ports
hierarchy level:
[edit chassis]
fpc slot-number {
pic pic-number {
aggregate-ports;
}
}
...
Chapter 3: Configuring Physical Interface Properties
statement at the
hierarchy level:
statement at the
[edit chassis fpc slot-number pic
Specifying OC768-over-OC192 Mode
[edit chassis lcc lcc-number
107
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