OCx/STMx POS line modules pair with OC3-4 I/O modules to deliver unchannelized OC3/STM1 POS operation through four line interfaces.
OCx/STMx POS line modules pair with OC12 I/O modules to deliver unchannelized OC12/STM4 POS operation through one line interface.
I/O modules that support single-mode (intermediate reach or long haul), or multimode operation through SC full duplex connectors are available. I/O modules that support APS/MSP are also available.
Figure 6 shows the interface stack for OCx/STMx POS interfaces.
Figure 6: Interface Stack for OCx/STMx POS and OC48/STM16 Interfaces