3Com 3C13751 Getting Started Manual page 37

Figure 19 X.21 DTE cable assembly
X.21 DCE cable assembly
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Figure 20 X.21 DCE cable assembly
The synchronous/asynchronous series interface matches a DB28
connector, and current these types of synchronous/asynchronous series
interface cables are supported:
V.24 (RS232) DTE cable: DB25 (male) connector
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V.24 (RS232) DCE cable: DB25 (female) connector
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V.35 DTE: 34PIN (male) connector
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V.35 DCE: 34PIN (female) connector
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X.21 DTE: DB15 (male) connector
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X.21 DCE: DB15 (female) connector
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The following figures show the cable assembly of all these types:
V.24 DTE cable assembly
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Router to WAN Connection 37