Huawei Quidway R2600 Series

Installation Manual
Quidway R2600/3600 Series Modular Routers
Chapter 8
Function Modules
8-17
Enlarged A side
Pos.1
Pos.50
A
P2 P1
B
DB50 Male DB25 Male
Enlarged B side
Pos.25
Pos.1
Label
Figure 8-21 EIA-232 (V.24) DTE cable
Table 8-12 EIA/TIA-232 DTE cable pinouts (DB-50↔DB-25)
DB-50 Signal Description Direction DB-25 Signal
5 TxD/RxD Twisted pair no. 5
→
2TxD
27 RxD/TxD Twisted pair no. 9
←
3RxD
2 RTS/CTS Twisted pair no. 4
→
4RTS
31 CTS/RTS Twisted pair no. 10
←
5CTS
6 DSR/DTR Twisted pair no. 11
←
6DSR
30 DCD/LL Twisted pair no. 12
←
8 DCD
3 TxC/NIL Twisted pair no. 8
←
15 TxC
28 RxC/TxCE Twisted pair no. 7
←
17 RxC
1 LL/DCD Twisted pair no. 2
→
18 LTST
26 DTR/DSR Twisted pair no. 3
→
20 DTR
4 TxCE/TxC Twisted pair no. 6
→
24 TxCE
50 GND Single - 1 Shield_GND
7 GND Twisted pair no. 1 - 7 Circuit_GND
23 MODE-DCE Shorting group GND - -
21 MODE-0 Shorting group GND - -
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Note:
The pins not referenced in the above table are not connected.
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EIA/TIA-232 DCE