Board timeslot configuration

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You can set the timeslot configuration mode on the WDM-side port of a board. The service mapping paths of a board vary depending on the ODUk timeslot configuration mode.
In Assign consecutive mode, level-by-level service mapping is performed from lower rates to higher rates, for example, ODU0->ODU1->ODU2.
In Assign random mode, cross-level service mapping is performed from a low rate to a high rate, for example, ODU0->ODU2.

Other related questions:
Differences between timeslot allocation modes of the ClientLP ports on TOM boards on OSN 6800 devices and related precautions
Question: The current product manuals and configuration manuals for OSN 6800 devices do not describe timeslot configuration for TOM boards. When timeslots are incorrectly configured, services will fail to be provisioned, or abnormal alarms will be reported, which also causes the failure to provision services. Why? Analysis: The service type configuration sequence for channels on the ClientLP port is associated with the automatic timeslot allocation mode. Answer: Timeslots of TOM boards can be automatically or manually allocated. The automatic timeslot allocation mode is used by default. You can change the allocation mode in the WDM timeslot configuration window. 1. In automatic allocation mode, timeslots are automatically allocated based on the channel service type configured for the logical port ClientLP on TOM boards. The TOM boards, whose service types are first configured, will be first allocated with timeslot channels with channel numbers sorted in ascending order. In the non-cascading mode, each ClientLP port of a TOM board is allocated with 16 timeslots. For example, if the GE service is first configured for the ClientLP1-1 port and then the STM-4 service is configured for the ClientLP1-2 port, channels 1 to 7 (transmit and receive timeslots) will be automatically allocated for the ClientLP1-1 port in the WDM timeslot configuration window, and channels 5 to 8 will be allocated for the ClientLP1-2 port. Reversely, if the STM-4 service is first configured for the ClientLP1-2 port and then the GE service is configured for the ClientLP1-1 port, timeslots 1 to 4 will be allocated for the ClientLP1-2 port and 5 to 11 will be allocated for the ClientLP1-1 port. The numbers of transmit and receive timeslots are consistent. 2. In automatic mode, pay attention to the timeslot mapping between the service adding and dropping ends. The incorrect service type setting sequence may cause an incorrect association between timeslots at two ends and also a failure to provision services. 3. In manual mode, the transmit and receive timeslot numbers are manually configured for ClientLP ports. The number of timeslots must be consistent with service types. For example, the STM-16 service occupies 16 timeslots, the GE service occupies seven timeslots, and the STM-4 service occupies four timeslots. The transmit and receive timeslots at the ports can be inconsistent, but the transmit and receive timeslots at the adding and dropping ends of a service must be consistent. 4. If no service type is configured for a ClientLP port channel, the channel will not be displayed in the timeslot configuration window. If no service type is configured for all channels at a ClientLP port, the port cannot be selected in ODU1 cross-connection configuration. Suggestion and conclusion: You should understand the timeslot allocation rules for channels on TOM boards, preventing the failure to provision services when timeslots are incorrectly configured.

Differences between timeslots occupied by GE services on LOM boards and those on other boards
Different from other boards, a LOM board maps a client service into an STM-64 signal and then multiplexes the STM-64 signal into an OTU2.An STM-64 signal is divided into 8 timeslots, each of which occupies 1.24 Gbit/s bandwidth. Therefore, a GE service on a LOM board occupies one timeslot. On other boards, each timeslot occupies 155 Mbit/s bandwidth. Therefore, a GE service on another board occupies seven timeslots.

Reason why the timeslots occupied by GE services on the LOM board are different from those on other boards
The LOM board is specially designed to map client-side services to STM-64 signals and then encapsulate the services into OTU2 signals. STM-64 is divided into eight timeslots, and the bandwidth of each timeslot is 1.24 Gbit/s. Therefore, only one timeslot is required for the GE service. In contrast, the bandwidth of each timeslot on other boards is 155 Mbit/s, and 7 timeslots are required for the GE service.

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