SIERRA is a digital optical repeater system which is capable of accommodating multi-band, multi-operator, and it is possible to expand wireless service for in-building area. This system can accommodate up to 4 bands, providing 700MHz (28MHz) LTE service, 850MHz (32MHz) WCDMA, LTE service, 1.9GHz (65MHz) WCDMA, LTE service, 2.1GHz (45MHz) WCDMA, LTE service ,and 2.3GHz (LTE) and 2.5GHz (TD-LTE) can be supported as well with an additional remote unit. 2.3GHz (LTE) and 2.5GHz (TD-LTE) can be supported as well with an additional remote unit.

- Minimization of changes when changing base station interface (RF / IF / CPRI / Digital IQ / etc.)
- Optimization of transmission capacity between devices
- Modular for maintenance, upgrades and operation convenience
- F / W upgrade of the system (remote download).
- Multi-Operator supported
. MIMO supported on 700, 2100, 2300, 2500.