Signal quality requirements for serial data transmission. Cross References:ISO 1282-9ISO 2382-9ISO 2389-9CCITT Recommendation V.5CCITT Recommendation V.6CCITT Recommendation V.10CCITT Recommendation V.11CCITT Recommendation V.22CCITT Recommendation V.22 bis CCITT Recommendation V.23CCITT Recommendation V.24 CCITT Recommendation V.26CCITT Recommendation V. 26bisCCITT Recommendation V.26terCCITT Recommendation V.27CCITT Recommendation V.27bisCCITT Recommendation V.27terCCITT Recommendation V.28 CCITT Recommendation V.29CCITT Recommendation V.32 CCITT Recommendation V.33CCITT Recommendation V.35 CCITT Recommendation V.36CCITT Recommendation V.37 CCITT Recommendation V.110CCITT Recommendation X.10 CCITT Recommendation X.21CCITT Recommendation X. 21bisCCITT Recommendation X.22CCITT Recommendation X.24CCITT Recommendation X.30CCITT Recommendation X. 31