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PBL386112SHS Datasheet(PDF) 10 Page - Ericsson |
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PBL386112SHS Datasheet(HTML) 10 Page - Ericsson |
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10 / 18 page  PBL 386 11/2 10 Figure 9. Simplified ac transmission circuit. Functional Description and Applications Information Transmission PBL 386 11/2 + - + - VTX RSN I L /α TIPX RINGX + - EL + - TIP RING RF RF ZTR ZT VTX VRX ZRX IL IL RHP + - ZL VTR G RSN 2-4S General A simplified ac model of the transmission circuits is shown in figure 9. Circuit analysis yields: V TR = V TX - I L • 2RF (1) G 2-4S V TX + V RX = I L (2) Z T Z RX α RSN V TR = IL • ZL - EL (3) where: V TX is a ground referenced version of the ac metallic voltage between the TIPX and RINGX terminals. V TR is the ac metallic voltage between tip and ring. E L is the line open circuit ac metallic voltage. I L is the ac metallic current. R F is a fuse resistor. G 2-4S is the SLIC two-wire to four- wire gain (transmit direction) with a nominal value of -0.5. Z L is the line impedance. Z T determines the SLIC TIPX to RINGX impedance for signal in the 0 - 20kHz frequency range. Z RX controls four- to two-wire gain. V RX is the analogue ground referenced receive signal. α RSN is the receive summing node current to metallic loop current gain. The nominal value of α RSN = 400 Two-Wire Impedance To calculate Z TR, the impedance presented to the two-wire line by the SLIC including the fuse resistor R F, let VRX = 0. From (1) and (2): Z TR = Z T - 2R F α RSN • G2-4S Thus with Z TR, G2-4S, αRSN, and RF known: Z T = αRSN • G2-4S • (2RF - |ZTR|) Two-Wire to Four-Wire Gain From (1) and (2) with V RX = 0: G 2-4 = V TX = Z T/αRSN V TR Z T - 2R F α RSN • G2-4S Four-Wire to Two-Wire Gain From (1), (2) and (3) with E L = 0: G 4-2 = V TX = Z T • Z L V TR Z RX Z T - G 2-4S • ( Z L + 2RF) α RSN In applications where 2R F - ZT/(αRSN • G2-4S) is chosen to be equal to Z L, the expression for G4-2 simpli- fies to: G 4-2 = - Z T • 1 Z RX 2 • G 2-4S Four-Wire to Four-Wire Gain From (1), (2) and (3) with E L = 0: G 4-4 = V TX = Z T • G 2-4S • ( ZL + 2RF) V RX Z RX Z T - G 2-4S • ( ZL + 2RF) α RSN |
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