Cisco Aironet 1300 Power Injector - LR2T AIR-PWRINJ-BLR2T= 사용자 설명서
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R E V I E W D R A F T — C I S C O C O N F I D E N T I A L
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Cisco Aironet Power over Ethernet Application Note
PoE Requirements for Cisco Access Points
The figures used in Table 1 were calculated as described below in
.
Note
The power requested for the switch/box by the access point must take into account the resistance
of 100 m of Category 5 Ethernet cable.
of 100 m of Category 5 Ethernet cable.
Figure 2
Power Calculation Formula for PSE
V = voltage, R = resistance of cable (Ohms), PowerPD = power Consumed by the access point (W)
The worst case voltage is 40 V. The resistance of the Category 5 cabling is in Ohms.
Note
Always check the power specifications of the PSE (switch, mid-span power, or injector) to confirm that
it can support the access point you are deploying. If the PSE cannot supply enough power, the access
point radios may be disabled or the access point may repeatedly “reboot” as the device draws more power
than the PSE can supply. This imbalance trips the breaker causing it to reset as the breaker cools down
and causes the access point to appear to be cycling or rebooting.
it can support the access point you are deploying. If the PSE cannot supply enough power, the access
point radios may be disabled or the access point may repeatedly “reboot” as the device draws more power
than the PSE can supply. This imbalance trips the breaker causing it to reset as the breaker cools down
and causes the access point to appear to be cycling or rebooting.
1240 with 802.11g radio
(802.3af compatible)
(802.3af compatible)
11.40
12.960
1240 with 802.11a and 802.11g
radios (802.3af compatible)
radios (802.3af compatible)
12.95
15.00
1250 without installed radios
9.00
9.00
1250 with a single radio either
802.11a/n or 802.11bg/n
802.11a/n or 802.11bg/n
12.95
15.4
1250 with both 802.11a/n and
802.11bg/n radios**
802.11bg/n radios**
16.5
18.5
* 1250 with one radio: 802.3af compatible.
** 1250 with two radios: beginning late 2007, Cisco will enable auto-negotiating,
single-port power for the Cisco Aironet 1250 Access Point on leading switches
across the Catalyst portfolio.
across the Catalyst portfolio.
*** PSE value in watts is the value the power device will use for CDP.
Table 1
Cisco Aironet Access Point Power Requirements (in watts)
Cisco Aironet Access Point
Access Point Input Power
PSE Output Power (considers
cable loss)***
cable loss)***