D-Link Dsh8 Manual

 Chapter 8: Power Over Ethernet Overview 
GE-DSH-73/DSH-82 and DSH-82-PoE User Manual  167 
Figure 8-2 - Power Supplied over the Data Pins 
 
When to install PoE? 
Consider the following scenarios: 
•  • Youre planning to install the latest  VoIP Phone system to minimize cabling 
building costs when your company move s into new offices next month.   
•  • The company staff has been clamoring fo r a wireless access point in the picnic 
area behind the building so they can work on their laptops through...

Chapter 8: Power Over Ethernet Overview 
168  GE-DSH-73/DSH-82 and DSH-82-PoE User Manual 
The PoE Provision Process 
While adding PoE support to networked devices is relatively painless, it should be 
realized that power cannot simply be tran sferred over existing CAT-5 cables. Without 
proper preparation, doing so may result in  damage to devices that are not designed 
to support provision of power  over their network interfaces. 
The PSE is the manager of the PoE process.  In the beginning, only...

 Chapter 8: Power Over Ethernet Overview 
GE-DSH-73/DSH-82 and DSH-82-PoE User Manual  169 
The signature resistor lies in the PDs PoE fr ont-end, isolated from the rest of the PDs 
circuitries till detection is certified.  
Classification 
Once a PD is detected, the PSE may option ally perform classification, to determine 
the maximal power a PD is to consume. Th e PSE induces 15.5-20.5 VDC, limited to 
100 mA, for a period of 10 to 75 ms respon ded by a certain current consumption by 
the PD,...

Chapter 8: Power Over Ethernet Overview 
170  GE-DSH-73/DSH-82 and DSH-82-PoE User Manual 
down power within 50 to 75 milliseconds, while limiting current drain during this 
period to protect the cabling infrastructu re. Immediate voltage drop is avoided to 
prevent shutdown due to random fluctuations. 
Power Disconnection Scenarios 
The IEEE 802.3af standard requires that  devices powered over Ethernet be 
disconnected safely (i.e. power needs be s hut down within a short period of time 
following...

 
GE-DSH-73/DSH-82 and DSH-82-PoE User Manual  171 
Appendix A 
RJ-45 Pin Assignment  
Switchs RJ-45 Pin Assignments 
 
1000Mbps, 1000Base T 
 
Contact MDI MDI-X 
1 BI_DA+ BI_DB+ 
2 BI_DA- BI_DB- 
3 BI_DB+ BI_DA+ 
4 BI_DC+ BI_DD+ 
5 BI_DC- BI_DD- 
6 BI_DB- BI_DA- 
7 BI_DD+ BI_DC+ 
8 BI_DD- BI_DC- 
 
Implicit implementation of the crossover f unction within a twisted-pair cable, or at a 
wiring panel, while not expressly forbidden,  is beyond the scope of this standard. 
  

Appendix A: RJ-45 Pin Assignment 
172  GE-DSH-73/DSH-82 and DSH-82-PoE User Manual 
10/100Mbps, 10/100Base-TX 
When connecting your 10/100Mbps Ethernet Switch to another switch, a bridge or a 
hub, a straight or crossover cable is nece ssary. Each port of the Switch supports 
auto-MDI/MDI-X detection. That means you  can directly connect the Switch to any 
Ethernet devices without making a crossover cable. The following table a\
nd diagram 
show the standard RJ-45 re ceptacle/ connector and their pin...

  AppendixAppendix AAppendix AAppendix A: RJ-45 Pin Assignment 
GE-DSH-73/DSH-82 and DSH-82-PoE User Manual  173 
There are 8 wires on a standard UTP/STP cable and each wire is color-coded. The 
following shows the pin allocation and colo r of straight cable and crossover cable 
connection: 
Figure A-1: Straight-Through and Crossover Cable  
 
Straight Cable    SIDE 1  SIDE2 
SIDE 11
12
23
3
4
45
56
67
7
8
8
SIDE 2 1 = White / Orange 
2 = Orange 
3 = White / Green 
4 = Blue 
5 = White / Blue 
6 = Green...

: RJ-45 Pin Assignment 
174  GE-DSH-73/DSH-82 and DSH-82-PoE User Manual 
 
  

 
  175  
Appendix B 
Troubleshooting  
• Verify that is using the right power cord /adapter (DC 24-48V), please dont use the 
power adapter with DC output higher than  48V, or it may damage this device. 
•  Select the proper UTP/STP cable to cons truct the user network. Use unshielded 
twisted-pair (UTP) or shield twisted-pair  (STP) cable for RJ-45 connections that 
depend on the connector type the switch  equipped: 100O Category 3, 4 or 5 cable 
for 10Mbps connections, 100O Category  5 cable for...