
XRT59L921
19
REV. 1.2.1
TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT
NOTES:
1.
Figure 7 and Figure 8, indicate that for both 75 and 120 applications, the user should connect a 9.1 resistor, in series, between the TTIP/TRing outputs and the transformers.
2. Figure 5 and 6, indicate that the user should use a 1:2 STEP-UP Transformer.
FIGURE 7. ILLUSTRATION OF HOW TO INTERFACE THE TRANSMIT SECTIONS OF THE XRT59L921 TO THE LINE (FOR
75
APPLICATIONS)
FIGURE 8. ILLUSTRATION OF HOW TO INTERFACE THE TRANSMIT SECTIONS THE XRT59L921 TO THE LINE (FOR
120
APPLICATIONS)
TRANSMIT TRANSFORMER RECOMMENDATIONS
PARAMETER
VALUE
Turns Ratio
1:2
Primary Inductance
Isolation Voltage
Leakage Inductance
9.1
9.1
TxPOS_n
TxNEG_n
TxClk_n
XRT59L921
TxClk_n
TxPOS_n
TxNEG_n
TTIP_n
TRING_n
1:2
Coaxial cable
9.1
9.1
TxPOS_n
TxNEG_n
TxClk_n
XRT59L921
TxClk_n
TxPOS_n
TxNEG_n
TTIP_n
TRING_n
TRING_Channel_n
TTIP_Channel_n
1:2