40
C
HAPTER
3: I
NTRODUCING
R
OUTER
5000 F
AMILY
MIM
S
Table 35 lists the selections that the 2-port E1/CE1/PRI MIM DIP switches enable
and how to configure them:
Only trained staff should change the position of a DIP switch. Change BIT1-8 to on
when connecting a 75-ohm cable. Change BIT1-8 to off when connecting a
120-ohm cable.
Cables
The 2-port E1/CE1/PRI MIM interface cable is a G.703-compliant (or E1) cable. You
must order the cable you need from 3Com when you order the interface card. To
prevent damage to your router and to avoid voiding your warranty, use only the
appropriate cable offered by 3Com.
There are two types of cables that can be used with this MIM: a 75-ohm
unbalanced coaxial cable, and a 120-ohm balanced twisted pair cable.
Table 35
Selection and Configuration of the 2-Port E1/CE1/PRI MIM DIP Switches
DIP
Selection
Configuration of
75-ohm impedance
Configuration of
120-ohm impedance
1BIT
75-ohm/120ohm
On
Off
2BIT
On
Off
3BIT
On
Off
4BIT
On
Off
5BIT
On
Off
6BIT
RxRing grounding
mode
Off: RxRing is
grounded via
capacitance
On: RxRing is
grounded directly
-
7BIT
RxShield grounding
mode
-
On: RxShield is
grounded
Off: RxShield is not
grounded
8BIT
SxShield grounding
mode
-
Off: RxShield is
grounded via
capacitance
On: RxShield is
grounded directly.
Summary of Contents for 3C13755-US - Router 5642
Page 14: ...12 CHAPTER 1 INTRODUCING THE ROUTER 5000 FAMILY ...
Page 34: ...32 CHAPTER 2 INTRODUCING ROUTER 5012 SICS ...
Page 57: ...ADSL MIMM 55 ...
Page 58: ...56 CHAPTER 3 INTRODUCING ROUTER 5000 FAMILY MIMS ...
Page 68: ...66 CHAPTER 4 INSTALLING THE ROUTER ...
Page 90: ...88 CHAPTER 7 TROUBLESHOOTING ...
Page 100: ...98 APPENDIX A CABLE SPECIFICATIONS ...
Page 104: ...102 APPENDIX A OBTAINING SUPPORT FOR YOUR PRODUCT ...