Dell 2355DN Service Manual page 20

Product spec and feature
2.2.1.2 FAX Section
1) Modem Part
BLOCK DIAGRAM
Implemented by based on Silab DAA (Data Access Arrangement) Solution, and is roughly composed of two
kinds Chip Solution
- Si2435 (SSD) : Existing Modem Chip which adds SSD (System Side Device) for interfacing between LSD
- Si3018 (LSD) : LIU (Line Interface Unit) Chip which is controlled by SSD and satisfies each PSTN
Requirements by modulating internal Configuration with connecting Tel Line.
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Service Manual