EasyManuals Logo

3Com Router 3000 Series User Manual

3Com Router 3000 Series
37 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #30 background imageLoading...
Page #30 background image
Tab le 21 lists 4E1 conversion cable pinouts.
Internal DIP Switches The 4-port E1/CE1/PRI module provides internal DIP switches, and the setting of
DIP switches decides the interface impedance and grounding mode. On the 4-port
E1/CE1/PRI module, DIP switch S4 sets the impedance and grounding mode for
interface 2.
By default, all the DIP switches for the 4-port E1/CE1/PRI module are switched on
so the impedance of the E1 interface is 75-ohm. If you connect a 75-ohm cable,
switch BIT1-8 to ON. If you connect a 120-ohm cable, switch BIT1-8 to OFF.
Personnel who haven’t received training should not change the position of DIP
switch.
15 Rx Ring Rx Ring 5 Rx Ring
7 Rx Shield - 6 Rx Shield
Table 21 4E1 Conversion Cable Pinouts
DB25 DB15 Serial number
Pinout Signal Pinout Signal
2 TxR4 2 TxRing 4
16 RxSD4 7 RxShield
14 RxT4 8 RxTip
1 TxT4 9 TxTip
3 TxSD4 10 TxShield
15 RxR4 15 RxRing
0 TxR3 2 TxRing 3
19 RxSD3 7 RxShield
17 RxT3 8 RxTip
4 TxT3 9 TxTip
6 TxSD3 10 TxShield
18 RxR3 15 RxRing
0 TxR2 2 TxRing 2
22 RxSD2 7 RxShield
20 RxT2 8 RxTip
8 TxT2 9 TxTip
10 TxSD2 10 TxShield
21 RxR2 15 RxRing
12 TxR1 2 TxRing 1
25 RxSD1 7 RxShield
23 RxT1 8 RxTip
11 TxT1 9 TxTip
13 TxSD1 10 TxShield
24 RxR1 15 RxRing
Table 20 E1 Cable Pinouts (continued)
DB15
BNC (75-ohm coaxial
cable)
RJ-45 (120-ohm twisted pair)
3Com Router Release Notes for V1.20
30

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the 3Com Router 3000 Series and is the answer not in the manual?

3Com Router 3000 Series Specifications

General IconGeneral
Brand3Com
ModelRouter 3000 Series
CategoryNetwork Router
LanguageEnglish

Related product manuals