| Impedance |
Splitter |
Filter Choke Module |
Remark |
| 600 ohms | UTAPF218 | over POTS | |
| 270 ohms + (750 ohms//150nF) | UTAPF219 | UTAPF220 | over POTS |
| 320 ohms + (1050 ohms//230nF) | UTAPF221 | UTAPF222 | over POTS |
| 220 ohms +(820 ohms//115nF) | UTAPF223 | UTAPF224 | over POTS |
| 900 ohms | UTAPF225 | over POTS | |
| 135 ohms or 150 ohms | UTAPF226 | over ISDN |
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