The ES2 4G LM pairs with the ES2-S1 OC12-2 STM4 POS IOA to deliver unchannelized OC12/STM4 POS operation through two line interfaces. You can install the ES2-S1 OC12-2 STM4 POS IOA in both IOA bays.
The ES2 4G LM also pairs with the ES2-S1 OC48 STM16 POS IOA to deliver unchannelized OC48/STM16 POS operation through one line interface. In the current release, you can install the ES2-S1 OC48 STM16 POS IOA in only one of the IOA bays per slot.
Figure 7 shows the interface stack for OCx/STMx POS interfaces on the ES2 4G LM.
Figure 7: Interface Stack for OCx/STMx POS Interfaces
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