Timing Synchronization - Cisco ONS 15454 DWDM Reference Manual

Chapter 8 Transponder and Muxponder Cards
Figure 8-17
DWDM (Trunk)
STM-64 / OC-192
10.709, or
11.095 Gbps
STM-64 / OC-192
9.95328 or
10.70923 Gbps

8.7.1 Timing Synchronization

The MXP_2.5G_10G card is synchronized to the TCC2/TCC2P clock during normal conditions and
transmits the ITU-T G.709 frame using this clock. The TCC2/TCC2P card can operate from an external
building integrated timing supply (BITS) clock, an internal Stratum 3 clock, or from clock recovered
from one of the four valid client clocks. If clocks from both TCC2/TCC2P cards are not available, the
MXP_2.5G_10G card switches automatically (with errors, not hitless) to an internal 19.44 MHz clock
that does not meet SONET clock requirements. This will result in a clock alarm.
8.7.2 Automatic Laser Shutdown
The ALS procedure is supported on both client and trunk interfaces. On the client interface, ALS is
compliant with ITU-T G.664 (6/99). On the data application and trunk interface, the switch on and off
pulse duration is greater than 60 seconds. The on and off pulse duration is user-configurable. For details
regarding ALS provisioning for the MXP_2.5G_10G card, refer to the Cisco ONS 15454 DWDM
Procedure Guide.
8.7.3 MXP_2.5G_10G Card-Level Indicators
Table 8-13
78-18343-02
MXP_2.5G_10G Card Block Diagram
Optical
Transceiver
9.953,
10.3125,
Client
Optical
Transceiver
Flash
describes the three card-level LEDs on the MXP_2.5G_10G card.
Framer/FEC/DWDM
Processor
uP bus
uP
RAM
Cisco ONS 15454 DWDM Reference Manual, R8.5
8.7.1 Timing Synchronization
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