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Allowed Combinations for Line Rate Performance

The SRP-5G+ and SRP-10G modules support all the line modules listed in Table 39.

Only certain combinations of line modules allow line rate performance (see Table 40 through Table 42). However, if performance lower than line rate is acceptable, you can use any combination of line modules in a slot group.

For example, the SRP-10G module offers a total bandwidth of 2.5 Gbps for each slot group. The GE line module requires 2.46 Mbps bandwidth for operation at line rate, and can use both switches in the SRP-10G module. If you require line rate from a GE line module, install only one GE line module in the slot group. However, if lower performance is acceptable, you can install two or three GE line modules in a slot group and enable bandwidth oversubscription.

When bandwidth oversubscription is enabled, all line modules optimize use of the resources available. For example, if two GE line modules are installed in a slot group, each line module is allocated 50 percent of the available bandwidth. However, if one line module is using less bandwidth than it is allocated, the other line module can use more bandwidth than it is allocated and can operate at a greater rate.

Table 40, Table 41, and Table 42 indicate combinations of line modules that allow line rate performance.

Table 40: Combinations of Line Modules for Line Rate Performance—SRP-10G Module in an ERX-7xx Model

Possible Combinations of Line Modules	Examples of Allowed Combinations	Examples of Forbidden Combinations
One supported line module and one empty slot in slot group 1 NOTE: The SRP-10G module supports all line modules listed in Table 39. Two OCx/STMx ATM line modules in slot group 1 One supported line module in slot groups 2, 3 and 4	One OCx/STMx POS line module in slot group 1, a GE/FE line module in slot group 2, and one OCx/STMx ATM line module in slot group 4 Two OCx/STMx ATM line modules in slot group 1, one GE/FE line module in slot group 2, and one SM in slot group 3	A GE/FE line module and any other line module in slot group 1 Two OCx/STMx POS line modules in slot group 1

Table 41: Combinations of Line Modules for Line Rate Performance—SRP-10G Module in an ERX-1410 Router

Possible Combinations of Line Modules	Examples of Allowed Combinations	Examples of Forbidden Combinations
One supported line module and two empty slots in any slot group NOTE: The SRP-10G module supports all line modules listed in Table 39. Two OCx/STMx ATM line modules and one GE/FE module and one empty slot in any slot group (bandwidth oversubscription enabled) One OC3/STM1 GE/FE module in any slot (bandwidth oversubscription disabled)	One COCX-F3 line module in slot group 1, a GE/FE line module in slot group 2, and a OCx/STMx POS line module in slot group 3	Three OCx/STMx ATM line modules in any slot group Two GE/FE line modules in any slot group

Table 42: Combinations of Line Modules for Line Rate Performance—SRP-5G+ Module in an ERX-705 Router

Possible Combinations of Line Modules In Slot Groups	Examples of Allowed Combinations	Examples of Forbidden Combinations
NOTE: The total bandwidth of all line modules must not exceed 5 Gbps. To make optimal use of the available bandwidth, put line modules that require maximum bandwidth in slot 2, 3, or 4.
One supported line module and one empty slot in slot group 1 NOTE: The SRP-5G+ module supports all line modules listed in Table 39. Two OCx/STMx ATM line modules in slot group 1 One cOCx/STMx, COCX-F3, CT3/T3 FO, GE/FE, IPSec Service, or OCx/STMx line module in slot groups 2, 3, and 4	Two OCx/STMx ATM line modules (total 2.44 Gbps) in slot group 1, and a GE/FE line module (2.46 Gbps) in slot group 4 Two OCx/STMx ATM line modules (total 2.44 Gbps) in slot group 1, and a COCX-F3 line module in slot group 2	Two OCx/STMx ATM line modules (total 2.44 Gbps) in slot group 1, a GE/FE line module (2.46 Gbps) in slot group 3, and an OCx/STMx POS line module (2.46 Gbps) in slot 4 (violates chassis limitation) Two OCx/STMx POS line modules (total 4.92 Gbps) in slot group 1 (violates slot group limitation)

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