T7256

www.DataSheet4U.com Advisory November 1998 T7234, T7237, and T7256 Compliance with the New ETSI PSD Requirement (Refer to the T7234, T7237, and T7256 ISDN transceiver data sheets.) Telecommunication Standard The European Telecommunications Standards Institute (ETSI) has identified a change in the requirement of the power spectral density (PSD) for Basic Rate Interface ISDN. Section A.12.4, Power Spectral Density, of ETSI TS080 states the following: s The upper boundary of the power spectral density of the transmitted signal shall be as shown in Figure 1, below. Measurements to verify compliance with this requirement are to use a noise power bandwidth of 1.0 kHz. Systems deployed before January 1, 2000 do not have to meet this PSD requirement but shall meet the PSD requirements as defined in ETR 080 edition 2. It is, however, expected that these systems will also meet the PSD requirements of TS080 edition 3. Some narrowband violations could occur and should be tolerated. s s –20 –30 –40 –50 PSD (dBm/Hz) –60 –70 –80 –90 –100 –110 –120 –130 –140 0.001 0.010 0.050 1.000 0.315 30.000 5.000 0.100 f (MHz) 1.000 10.000 100.000 5-7388F Figure 1. Upper Boundary of Power Spectral Density from NT1 and LT The existing SCNT1 family (T7234A, T7237A, and T7256A) of U-interface transceivers fully comply with this standard. Conformance to the above requirement has been fully verified, and test reports are available upon request. For additional information, contact your Microel...