🚀 go-pugleaf

I have bought the above modem which did not come with its own serial modem to 
computer cable.  I tried it with a 25pin (modem end) to 9 pin (computer end) 
cable which works for my other modem (an old 1200baud Dacom).  No response was 
obtained from the USR modem using windows terminal or fax software.  The slow 
1200 baud modem works OK with the cable and windows terminal.  I had the USR 
replaced by the shop but with the same result (when a number is dialled the 
transmit and receive data LEDs flash momentarily then nothing happens).  Have 
I got 2 faulty modems or is the cable a problem? I cannot use a 25 pin to 25 
pin cable because both my serial ports are 9 pin.  Any helpful suggestions 
greatly appreciated.  Thanks in advance.

S Ghosal