gInpRtxMode - Upstream retransmission Mode (RTX MODE). The RTX_MODE is a configuration parameter used to control activation of retransmission during initialization. This parameter has 4 valid values: FORBIDDEN: ITU-T G.998.4 retransmission not allowed. PREFERRED: ITU-T G.998.4 retransmission is preferred by the operator. (i.e., if ITU-T G.998.4 RTX capability is supported by both XTU's, the XTU's shall select ITU-T G.998.4 operation for this direction). FORCED: Force the use of the ITU-T G.998.4 retransmission. (i.e., if ITU-T G.998.4 RTX capability in this direction is not supported by both XTU's or not selected by the XTU's, an initialization failure shall result). NOTE: Due to the optionality of ITU-T G.998.4 retransmission in upstream direction, the use of FORCED in upstream may lead to initialization failure, even if the XTU is supporting ITU-T G.998.4 (in downstream). TESTMODE: Force the use of the ITU-T G.998.4 retransmission in the test mode described in clause 10.4. (i.e., if ITU-T G.998.4 RTX capability is not supported by both XTU's or not selected by the XTU's, an initialization failure shall result). ITU-T G.998.4 11.1.13 Retransmission Mode (RTX_MODE)