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In this section I present two modem schematics:
This diagram shows how an internal SoftV92 Data Fax Modem interacts with phone line. The modem is from Zoltrix but a Conexant utility says it is a "Churchill Data Modem". This schematic may be useful to fix a similar modem.
IC# signals run to the indicated IC pin number, a 100 pin SMD chip with the following inscriptions:
CONEXANT HSFi CX11252-11 E151518.1 0136 MEXICO
The following schematic belongs to another PCI internal modem:
First part shows phone line interface and second part microphone/heads jacks.
3.3V supply is from a 3 leg SMD regulador running from 5V. The capacitor labeled "270V" parallel to the "LINE" input is a varistor of that value.
The IC in this modem has the following inscriptions:
RS56/SP-PCI R6793-11 (C) ROCKWELL 98 9919 879026.4 KOREA
I cannot measure SMD capacitors and inductors so they are unmarked on the schematics.
These schematics have been drawn tracing the circuits and may contain errors. I am not responsible for their use.
Document completed on July 2006 by Jeroni Paul.
Copyright © 2006 Jeroni Paul.