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51
GND
53
TXC1+
54
TXC1-
55
RXC1+
56
RXC1-
57
RXD1+
58
RXD1-
60
PORTMO
DE1
There are 3 kinds of 2-in-1 cables for DB60 synchronous/asynchronous ports,which are used connect external
equipment:V.28 2-in-1 cable with the number DRC3311,V.35 2-in-1cable with the number DRC3212 ,V.35 2-in-1
V.28&V.35 cable with the number DRC3312.
The picture of V.28 2-in-1 cable with the number DRC3311：
The picture of V.35 2-in-1 cable with the number DRC3212:
The picture of V35 2-in-1 V.28&V.35 cable with the number DRC3312:
Signal grounded
Second
group
transmits
phase of clock
Second
group
transmits
phase of clock
Second group receives positive phase
of clock
Second
group
negative phase of clock
Second group sends data positive
phase
Second group sends data negative
phase
Second
group
interface
selection
DTE
and
DCE
grounded
positive
DTE ← DCE，V35
negative
DTE ← DCE，V35
DTE ← DCE，V35
receives
DTE ← DCE，V35
DTE ← DCE，V35
DTE ← DCE，V35
mode
used to choose V28 or V35
- 17 -
DI-2621 Router
public
signal
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