3Com 3CR16708-91 Getting Started Guide - Page 28

Choosing the Correct RJ-45 Cables, WARNING, CAUTION

Get 3Com 3CR16708-91 - OfficeConnect Managed Switch 9 PDF manuals and user guides
UPC - 662705487151
View all 3Com 3CR16708-91 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 28 highlights

28 CHAPTER 2: INSTALLING THE SWITCH For further information about Power Over Ethernet, refer to "Power Management and Control" in the Switch Implementation Guide supplied on the CD-ROM that accompanies your Switch. Power over Ethernet management is available using the web interface or the command line interface (CLI). Choosing the Correct RJ-45 Cables All of the RJ-45 ports on the Switch are Auto-MDIX, that is they have a cross-over capability. The port can automatically detect whether it needs to operate in MDI or MDIX mode. Therefore you can make a connection to a port with a straight-through (MDI) or a cross-over cable (MDIX). The Auto-MDIX feature only operates when auto-negotiation is enabled. If auto-negotiation is disabled, all the Switch ports are configured as MDIX (cross-over). If you want to make a connection to another MDIX port, you need a cross-over cable. Many ports on workstations and servers are configured as MDI (straight-through). If you want to make a connection to an MDI port, you need to use a standard straight-through cable. See Table 7. WARNING: The Switch supports Power over Ethernet on rear ports 1, 2, 5 and 6. These ports should only be used for Ethernet wiring within the same building. The SFP and 100BASE-FX ports of the Switch 9 FX can be used for Ethernet wiring between buildings. 3Com recommends that you use Category 5e twisted pair cable - the maximum segment length for this type of cable is 100 m (328 ft). Table 7 Cables required to connect the Switch to other devices if auto-negotiation is disabled Cross-over Cable Switch to Switch (MDIX to MDIX) ✓ Switch to Hub (MDIX to MDIX) ✓ Switch to PC (NIC) ✕ (MDIX to MDI) Straight-through Cable ✕ ✕ ✓ CAUTION: If you want to install the Switch using a Category 5e or Category 6 cable, 3Com recommends that you briefly connect the cable

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
28
C
HAPTER
2: I
NSTALLING
THE
S
WITCH
For further information about Power Over Ethernet, refer to “Power
Management and Control” in the Switch Implementation Guide supplied
on the CD-ROM that accompanies your Switch. Power over Ethernet
management is available using the web interface or the command line
interface (CLI).
Choosing the Correct
RJ-45 Cables
All of the RJ-45 ports on the Switch are Auto-MDIX, that is they have a
cross-over capability. The port can automatically detect whether it needs
to operate in MDI or MDIX mode. Therefore you can make a connection
to a port with a straight-through (MDI) or a cross-over cable (MDIX).
The Auto-MDIX feature only operates when auto-negotiation is enabled.
If auto-negotiation is disabled, all the Switch ports are configured as
MDIX (cross-over). If you want to make a connection to another MDIX
port, you need a
cross-over
cable. Many ports on workstations and
servers are configured as MDI (straight-through). If you want to make a
connection to an MDI port, you need to use a standard
straight-through
cable. See Table 7.
WARNING:
The Switch supports Power over Ethernet on rear ports 1, 2,
5 and 6. These ports should only be used for Ethernet wiring within the
same building. The SFP and 100BASE-FX ports of the Switch 9 FX can be
used for Ethernet wiring between buildings.
3Com recommends that you use Category 5e twisted pair cable — the
maximum segment length for this type of cable is 100 m (328 ft).
Table 7
Cables required to connect the Switch to other devices if
auto-negotiation is disabled
CAUTION:
If you want to install the Switch using a Category 5e or
Category 6 cable, 3Com recommends that you briefly connect the cable
Cross-over Cable
Straight-through Cable
Switch to Switch
(MDIX to MDIX)
✓
✕
Switch to Hub
(MDIX to MDIX)
✓
✕
Switch to PC (NIC)
(MDIX to MDI)
✕
✓