| No. | Part Name | Description |
|---|
| 301 | FX609LG | Continuously variable slope delta modulation codec |
| 302 | FX611J | Sybscriber private metering (SRM) detector |
| 303 | FX611LG | Sybscriber private metering (SRM) detector |
| 304 | FX611LS | Sybscriber private metering (SRM) detector |
| 305 | FX613 | Universal Call Progress Decoder |
| 306 | FX613DW | Universal call progress decoder |
| 307 | FX613P | Universal call progress decoder |
| 308 | FX614 | Bell 202 Compatible FSK Modem |
| 309 | FX614D4 | Bell 202 compatible modem |
| 310 | FX614P3 | Bell 202 compatible modem |
| 311 | FX619 | 'Eurocom' Delta Codec |
| 312 | FX619J | Eurocom delta codec |
| 313 | FX619L1 | Eurocom delta codec |
| 314 | FX619L2 | Eurocom delta codec |
| 315 | FX619M1 | Eurocom delta codec |
| 316 | FX621LG | Low-power subscriber private metering (SRM) detector |
| 317 | FX621LS | Low-power subscriber private metering (SRM) detector |
| 318 | FX621P | Low-power subscriber private metering (SRM) detector |
| 319 | FX623 | Call Progress Tone Decoder |
| 320 | FX623P | Call progress tone decoder |
| 321 | FX629 | Delta Modulation Codec |
| 322 | FX629J | Delta modulation codec |
| 323 | FX631 | SPM Detector |
| 324 | FX631D5 | Low-voltage SRM detector |
| 325 | FX631DW | Low-voltage SRM detector |
| 326 | FX631P | Low-voltage SRM detector |
| 327 | FX633 | Call Progress Tone Detector |
| 328 | FX633D4 | Call Progress Tone Detector |
| 329 | FX633P1 | Call Progress Tone Detector |
| 330 | FX641 | Dual SPM Detector |
| 331 | FX641D2 | Dual subscriber private metering (SRM) detector |
| 332 | FX641P4 | Dual subscriber private metering (SRM) detector |
| 333 | FX643 | Call Progress Tone Detector |
| 334 | FX651 | SPM and Security Subsystem |
| 335 | FX663 | Call Progress Decoder |
| 336 | FX663D4 | Call progress detector |
| 337 | FX663P3 | Call progress detector |
| 338 | FX701 | Frequency Sensitive Switch |
| 339 | FX707 | Code and Automatic Repeat Encoder |
| 340 | FX709 | VSR Codec |
| 341 | FX709J | VOICE STORE RETRIEVE CVSD CODEC |
| 342 | FX709LH | VOICE STORE RETRIEVE CVSD CODEC |
| 343 | FX802 | DVSR Codec |
| 344 | FX802J | DVSR codec |
| 345 | FX802LG | DVSR codec |
| 346 | FX802LS | DVSR codec |
| 347 | FX803 | Audio Signalling Processor |
| 348 | FX805J | Sub-audio signalling processor |
| 349 | FX805LG | Sub-audio signalling processor |
| 350 | FX805LS | Sub-audio signalling processor |
| | |
