Chapter 46 Troubleshooting
ES3500 Series User’s Guide
336
One of the LEDs does not behave as expected.
1
Make sure you understand the normal behavior of the LED. See
2
Check the hardware connections. See
.
3
Inspect your cables for damage. Contact the vendor to replace any damaged cables.
4
Turn the Switch off and on.
5
Disconnect and re-connect the power cord to the Switch.
6
If the problem continues, contact the vendor.
A device that you expect to be powered via Ethernet doesn’t receive power over Ethernet.
1
Make sure the PoE LED for the port supplying power over Ethernet is on.
2
Make sure the Switch port has PD selected so it can supply power over Ethernet. See
3
Inspect your Ethernet cables for damage. Replace any damaged cables.
4
Check cable lengths.
5
Disconnect the device that you expect to be powered via Ethernet and make sure the Switch has
enough remaining power to supply the device before re-connecting it. See
6
Increase the priority of the port. See
A port is cabled correctly, but the port status is down.
1
Disable Green Ethernet on the port. See
for details of how to do this. If the
port comes up, then the port at the other end of the link probably doesn’t support Green Ethernet.
If the port comes up, then try disabling and re-enabling the port again.
2
Inspect your Ethernet cables for damage. Replace any damaged cables.
3
Check cable lengths.
4
Check that the device at the other end of the link is powered on.
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
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
