Interface boards that an EMS2 board on an OSN 3500 can work with

An EMS2 board on an OSN 3500 can work with the following types of interface boards:
1. Works with two ETF8 boards to receive and transmit FE signals over 16 electrical ports.
2. Works with two EFF8 boards to receive and transmit FE signals over 16 optical ports.
3. Works with an ETF8 board to receive and transmit FE signals over 8 electrical ports, or works with an EFF8 board to receive and transmit FE signals over 8 optical ports.

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