The present invention supports a voice messaging service in a wireless communications system. The at least one conductive material fill portion includes a doped polycrystalline semiconductor fill portion. The TMM signal undergoes inter-mode mixing in the multi-path fiber before being received by the optical receiver. Additionally, the CPU is configured to utilize a second subset of the plurality of cache lines when accessing data stored in the internal case at a second resolution, where the first and second resolutions are different resolutions.