Extreme Networks BlackDiamond 8800 Series - Transmitter Clock Locking Mode

Extreme Networks Optics
Extreme Networks Consolidated ExtremeXOS Hardware Installation Guide
360
CAUTION
The maximum input power (average receive power) should be less than 0.5 dBm.
Transmitter Clock Locking Mode
The LW XENPAK module provides an interface connection between a 10-gigabit Ethernet and a 10-
gigabit SONET/SDH network from a 10-gigabit Ethernet equipment port.
The default transmitter clock locking mode of the LW XENPAK module is set to line timing mode.
When in line timing mode, the LW XENPAK module transmitter clock is locked to the receiver-
recovered clock. When the LW XENPAK is connected to the SONET/SDH network on the other side of
optical cable, the LW XENPAK transmitter clock synchronizes with the SONET/SDH clock source,
which helps reduce the pointer adjustment between the SONET/SDH network and the LW XENPAK.
To prevent a clock reference loop, be sure that only one end of a link is using line timing mode and to
use internal timing when testing with an optical loopback cable.