Muratec MFX-C4000 Field Engineering Manual page 49

Product Specifications and Features
• Serial & Parallel Types
How to connect a serial fax first.
1) connect a line cord into Line RJ11.
2) Connect 2'nd phone by 4 line cord.
How to connect Parallel Fax
1) Connect a line cord into Line RJ11.
2) Just connect a phone to External RJ11.
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Service Manual