Method used to configure the timeslot mode when a universal line board carries SDH and packet services

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When a universal line board carries packet services and SDH services, ODU Timeslot Configuration Mode can be set only to Assign random.

Other related questions:
Whether universal line boards, TDM (SDH) boards, and packet boards can be used in a subrack in master-slave mode
The boards can be used in independent subracks only.

Whether universal line boards can be used in slave subracks
No. Universal line boards can be used only in independent subracks, but not in the master or slave subracks.

Reasons for pointer justification on an SDH line board
Reasons for pointer justification on an SDH line board: The reason why pointer justification occurs on an SDH line board is that NE clocks are not synchronized. When the rate (frame rate) of VC-4 is higher than that of AU-4, a negative pointer justification occurs. When the rate of VC-4 is lower than that of AU-4, a positive pointer justification occurs.

Difference between Assign consecutive mode (fixed timeslot mode) and Assign random mode (flexible timeslot mode) of a line board
The Assign random mode indicates that cross-layer mapping can be performed for services, such as ODU0->ODU2, ODU1->ODU2, and ODUflex->ODU2. Cross-layer mapping reduces the number of mapping layers and simplifies the relationship between client and server trails, facilitating management. Cross-layer mapping enables flexible bandwidth usage. For example, when seven 1.25G timeslots of an ODU2 pipe are occupied by ODUflex services, the remaining 1.25G bandwidths can be used by cross-layer mapping from ODU0 to ODU2. Assign consecutive indicates that layer-by-layer mapping of services is performed from lower rates to higher rates, for example, ODU0->ODU1->ODU2 and ODU1->ODU2. The Assign random mode is recommended. When two line boards are interconnected on the WDM side, they must have the same setting of the ODU Timeslot Configuration Mode parameter.

Board timeslot configuration
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.

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