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PE-65793 Datasheet(PDF) 4 Page - Pulse A Technitrol Company |
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PE-65793 Datasheet(HTML) 4 Page - Pulse A Technitrol Company |
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4 / 7 page  T604.F (05/12) 4 pulseelectronics.com ISDN S-Interface Transformers Surface Mount, Dual, 2000Vrms 1. General Information - The S-interface is the standardized four-wire digital telephone access point defined by the CCITTI I-series recommendations for the Integrated Services Digital Network. This “basic rate access” accommodates two 64Kpbs “B-channels” for information, one 16Kbps “D-channel” intended for signaling and control, and 48 Kbps for framing and other purposes, giving a total rate of 192Kbps. The CCITT physical layer recommends that the user network interface be transformer coupled. A typical application circuit is presented in Figure 1. The transformer provides isolation for the line card or the terminal from the line. It is also a way to provide phantom power feeding to the terminal over the S-loop. Each end requires a transmit and a receive transformer. Chokes are used in some applications to reduce common mode noise (see note 5). The transformers described in this data sheet are matched to the transceivers offered by the major IC manufacturers listed. The use of a transformer-chip pair assures that all requirements of CCITT I.430 are met with respect to pulse waveform templates, impedance and longitudinal balance. In addition, the transformers provide the isolation voltages required by the regulatory agencies and are capable of passing surge voltage tests. 2. Longitudinal Balance for Transformers - The longitudinal conversion loss specification in I.430 includes a test setup that is intended for system evaluation, whether TE or NT. Such a test is performed with DC current present. The transformer plays an essential role in achieving the required balance. However, all other elements in the circuit should be also designed to provide the highest possible symmetry. These elements include the protection circuitry, series resistors, chip transmitter output and receiver input, as well as the cables used and the TE cord where applicable. A high level of transformer balance compensates for some circuit AC- unbalance, and assures compliances of the system with I.430 on longitudinal conversion loss (LCL) and signal balance. This is accomplished by a well AC-balanced winding configuration whereby the capacitive coupling between primary and secondary windings is evenly distributed. Also, both halves of the lineside winding are well balanced. The transformers meet the following LCL specifications: •10kHzto300kHz:60dBminimum •300kHzto1MHz:Minimumvaluedecreasing 20dB/decade. (continued on next page) IC XMIT Sec : Pri RCV High Freq Choke IC RCV XMIT Low Freq Choke Low Freq Choke High Freq Choke S-INTERFACE Local Power DC Supply Pri : Sec NT TE Sec : Pri Pri : Sec Figure 1. Typical ISDN S-Interface Application Circuit |
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