Questions tagged [hardware]

For questions about network hardware. For instance, switches, routers, firewalls, bridges, IP phones, Wireless lan controllers, Access points etc.

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How do I connect my router to fiber via transceiver? [closed]

I have 8gb wifi and wanted to connect it directly to my wifi 7 router, but the router requires a transceiver (it has no regular fiber port like the one the isp sent me). The problem is all the ...
Badasahog's user avatar
  • 101
0 votes
2 answers
66 views

Hardware compatibility of SFP+ devices [closed]

I have a Supermicro E300-8D (used as firewall) I want to plug to a Mellanox SX1012 device. I have tried different cables : mellanox mc2309130-001 supermicro cbl-0348L different switches : Mellanox ...
Dede's user avatar
  • 101
0 votes
2 answers
184 views

Streamlining Network Maintenance : Automated Remote Backups for Lenovo, Force10, and Dell Switches

Can these switches be backed up automatically and pushed to a remote server via FTP? I attempt to find a way to automate the process of creating periodic backups of switches and sending them to a ...
jrogers's user avatar
0 votes
1 answer
573 views

Bash script to gather serial numbers from list of cisco switches

I have pieced together a script to login to each switch listed in the file switch.txt, grab the serial number and place it with the IP address into the CSV serials.csv. The problem I am having is that ...
Matthew Cardinal's user avatar
0 votes
1 answer
158 views

What’s the difference between Intel XXVDA2 and XXVAM2? [closed]

I have been looking at 25GBit NICs for SFP28 transceivers and came across the Intel XXV710 cards. Since I couldn’t figure out the naming scheme of these NICs, I have no idea what the difference is ...
comfreak's user avatar
  • 147
3 votes
2 answers
1k views

Are LC-UPC connectors compatible with LC-PC?

I’ve come across various articles online that explain the differences between APC and UPC, where the former has an angled polish and the latter is a straight “cut”. Some of them explain that UPC and ...
comfreak's user avatar
  • 147
1 vote
1 answer
186 views

Is there a difference between BIDI LR and DFB BiD or are they compatible?

My ISP is offering 25GBit Fiber soon and I am looking into the required hardware. One of the devices I will need to purchase is a new transceiver that can handle the speeds. The one my ISP recommends ...
comfreak's user avatar
  • 147
0 votes
1 answer
398 views

How FDB (Filtering Database) is filled out

I would like to understand what is used as a VLAN column in the FDB. For ACCESS port it is PVID if frame untagged or frame VID if frame is tagged, for TRUNK it is allowed VLANs? We can represent the ...
Manticore's user avatar
  • 131
1 vote
1 answer
732 views

Turning Off SPC card on Juniper SRX5800 series Firewall

We are running SRX5800 in a cluster. Each Node has FPCs as well as SPCs installed. Due to some maintenance downtime , we were required to power off FPCs as well as SPCs on a backup node , not in a ...
Nabeel's user avatar
  • 1,120
2 votes
1 answer
132 views

If one of hub is damaged,will it cause others hub damage too?why can't i enable the rapid dual homing

There is a multi-ring topology, combined with 8 Hubs and 2 switches, i want to ask two questions 1. If H3 is damaged,but the fiber is still ok, will H2 damage too in the future? i have thinking to ...
user16266657's user avatar
0 votes
1 answer
119 views

How do internet backbones (and their terminations) work? [closed]

If I establish a TCP connection between a web browser in an Australian household laptop, and a web server in a US data centre, what chain of physical hardware will the signal be sent through? For ...
benjimin's user avatar
  • 103
2 votes
2 answers
1k views

Can I backup config of an EdgeRouter Lite 3 to an EdgeRouter 4? [closed]

After having worked 6 years and 24/7, my EdgeRouter Lite 3 have definitely died. I want to replace it by a new EdgeRouter 4. Can I easily use my EdgeRouter Lite 3 backup files and import it to a new ...
Loraga's user avatar
  • 41
16 votes
2 answers
3k views

What is this device used by a networking technology company?

I recently saw two men open up the sidewalk in a major German city. It seemed they dug out this device Both men worked for a networking technology company, so I hope this is on topic here. What is ...
Stefan's user avatar
  • 271
1 vote
1 answer
694 views

CB fabric links require upgrade/training after adding New FPC in Juniper MX480

We are running a Juniper MX480 router is a production environment. Due to increase in traffic trend , it was required to installed new FPC 'MPC-3D-16XGE-SFPP' into slot 5 of MX480. Before the addition ...
Nabeel's user avatar
  • 1,120
1 vote
3 answers
1k views

How can twinaxial cables be faster than CAT cables

I've recently discovered that twinaxial cables can have very high transfer speeds of 100gbps. Even the ancient technology of RG-6 can get gigabit speeds with moca. The thing I don't understand is why ...
mberna's user avatar
  • 113
1 vote
1 answer
289 views

PHY, SFPs and NBASE-T

I see 10G SFP+ modules (RJ45 port) popping up claiming to be able to also run 1G and foremost 2.5G/5G (NBASE-T). What if the switch itself only refers to the following standards? IEEE 802.3ab ...
Marki's user avatar
  • 1,211
1 vote
2 answers
919 views

Are optical Gigabit SFP modules backwards compatible with 100Base-Fx?

My FTTH connection is using an old CareLink CL-MC-W2B-20-100 optical converter. It is labelled: 10/100 Base-T to 100Base-Fx bi-direction/single fiber media converter 10/100M Single mode WDM 20Km ...
Vasfed's user avatar
  • 111
2 votes
1 answer
830 views

How does a switch port connect to any other port?

According to Data Communications and Networking by Behrouz Forouzan, a packet switch has four components: input ports, output ports, routing processor, and switching fabric. The basic architecture ...
Noob_Guy's user avatar
  • 481
1 vote
1 answer
211 views

Port mirroring question

I've got some questions about my port mirroring configuration. I'm working with alcatel omniswitch. After configuring port mirroring my destination port is loosing network connection and it can't ...
luqson7's user avatar
  • 13
2 votes
1 answer
881 views

What is a "gearbox"?

What is a "gearbox" in the context of networking chips? The term often comes up in conjunction with SERDES (serializer / de-serializer).
Bruno Rijsman's user avatar
6 votes
1 answer
424 views

How to use an optical tap? Which fiber should I use?

We have an optical tap (https://www.fs.com/products/73675.html) that provides an LC connector providing two TX instead of RX/TX. As you can see, there is a conflict. What I think I need: A splitter ...
None's user avatar
  • 396
1 vote
1 answer
313 views

Can't install OS on S6000-ON

I have a Dell Networking S6000-ON. I'm trying to install an OS with ONIE but am running into an issue with the EEROM TLV info. Using some of the onie-syseeprom commands came back with this: ONIE-...
JimE's user avatar
  • 11
0 votes
1 answer
107 views

Is there a MTBF related to port linking?

During a firmware upgrade, I've noticed one problem: An equipment keeps linking/unlinking on a specific port of a PowerConnect 3548(stp portfast, switchport access mode). I've contacted the local ...
user avatar
47 votes
5 answers
21k views

Is Ethernet port blinking really useful?

This question may not look as an important one and in fact it is just out of curiosity. But to the point: Is Ethernet port blinking really useful? Ethernet ports usually have two light indicators ...
Stanowczo's user avatar
  • 581
7 votes
3 answers
23k views

Does it make sense to generally "Disable TCP Checksum Offload"?

In a work sheet for PCs that we deliver to customers, I found instructions to always "Disable TCP Checksum Offload" on the NICs. Via those NICs, the PCs are connected to the customer's LAN, and it is ...
doppelfish's user avatar
3 votes
1 answer
210 views

Is temperature sensor on zero enough to prove PoE Control Module is failed?

I'm probing an issue where 4 PoE cameras can't get powered on. Switch model Dell N2048P Series. The "P" at the end of the model stands for "PoE Enabled" so, this feature is/should be available. The ...
user avatar
1 vote
1 answer
134 views

Cisco router boot error

When I start my Cisco router it shows me the attached error. What is the problem with the NVRAM of the router and how do I fix it? Thanks.
Tahree khan's user avatar
1 vote
1 answer
2k views

SG500 powers on, but won't boot, won't reset

I have a Cisco SG500-52 switch. On boot the Fan light comes on green, and the System light starts blinking green. No other lights show (no port lights at all). I tried rebooting or resetting the ...
Daniel's user avatar
  • 111
2 votes
1 answer
1k views

Load-balancing one VPN-connection over multiple WANs

My internet connection will be provided by 4 different WANs (each 250 Mbit down, 100 Mbit up), which should be load-balanced to one 1 Gbit connection (full duplex, most likely ethernet (should be ...
Tobseb's user avatar
  • 21
0 votes
1 answer
116 views

What are the major factors influencing the variance in time packets need to be transferred? [closed]

It's pretty easy to see that packets transferred via internet take not a constant amount of time, even if the two communication partners don't change the location and the route in between likely doesn'...
Martin Thoma's user avatar
7 votes
3 answers
6k views

Is there any reason to use a hub over a switch?

Given that hubs are essentially the same as switches, as far as I know, except they share bandwidth between all connected devices, while switches do not, resulting in faster connections. I am simply ...
Ashtin Blanchard's user avatar
3 votes
2 answers
3k views

What advances in hardware allowed DPDK to increase performance on packet processing? [closed]

I've heard that DPDK library will allow us to use more Software-switches/routers (and maybe even to replace them completely), because somehow it helps dramatically increase performance on processing ...
Евгений Артеменко's user avatar
2 votes
2 answers
230 views

How to debug an unstable connection in a P2P configuration

I have a setup where I have two computers connected to each other (C1 and C2). Both have a static IP and they know each others IP. C2 sends UDP packets to C1 and C1 receives and logs them. Seems ...
Steven's user avatar
  • 23
4 votes
1 answer
93 views

Cisco 6500 chassis modules color edge

The modules for the Cisco 6500-series switches have a color band on the right edge. The most common I've seen are magenta (or an occasional purple) on Ethernet modules and aqua on supervisors. Are ...
melds's user avatar
  • 141
4 votes
0 answers
461 views

HP 5500 JD374A Port naming convention

Hi to all :) To most of you it'll prolly sound like a very silly question to ask, however to me as a fresh network trainee the answer is unfortunately not so obvious. So, the question is whether the ...
Martin Ledermann's user avatar
0 votes
1 answer
52 views

Is the auto-correlation of a frame transient based on the physical characteristics of a device?

I am currently studying ways to fingerprint Wi-Fi devices based on their physical characteristics and I was struck by a question after reading Section B of this paper http://www.ccs-labs.org/bib/...
Daniele's user avatar
0 votes
2 answers
384 views

Hardware Implementation of Ports

What is the hardware implementation of a port and/or network socket? I understand that, at the lowest level, x86 uses opcodes such as IN and OUT when the data resulting from the instruction execution ...
Michael Kennedy's user avatar
11 votes
1 answer
6k views

Why does 10Gbps ethernet claim PAM16 encoding then use a squared DSQ128 constellation?

I've been looking into the way that 10 Gbps Ethernet encodes its data and I'm a little confused by the nomenclature. I have gathered, e.g. from here http://www.ikn.no/download/Whitepaper-10G-...
CharlieB's user avatar
  • 213
1 vote
1 answer
1k views

Cisco 3850 Model Naming Convention?

I am having some trouble identifying a switch model via the CLI, and also understanding the differences between a few different models. The models in question are : 3850-48P-S 3850-48P-L 3850-48P-E ...
stets's user avatar
  • 1,010
1 vote
5 answers
115 views

Is it possible to create a collaborative network?

My problem, I have a hotel in a remote area, with many guests and a lot of Internet use. Is there a way to use Internet from different sources and combine it to increase the total network speed? ...
user9219312's user avatar
4 votes
2 answers
3k views

Software Switches vs Hardware Switches [closed]

My main question is why service providers don't move to all software switches? I know the answer must be the rates, capacity and port density of the hardware switches. So what are the difference ...
Human's user avatar
  • 141
7 votes
2 answers
749 views

What certifications are there for Fiber Optic termination and splicing?

As a knowledgeable person in computer networks I have always had an itch for learning how to create custom-length fiber optic cables. So, as a personal goal, I want to get trained and certified in ...
angelcool.net's user avatar
2 votes
1 answer
4k views

How to determine if a port is physically(hardware) bad

We are using a 48 port 3com baseline switch and recently ports have started dropping, completely shutting off(no connection light) and have switched to another open port and moved on our merry way. ...
zerodoc's user avatar
  • 123
2 votes
2 answers
58 views

Is it possible to design a network switch that could work only with combinational or sequential logic circuits without a software?

And if it is possible are there any companies that are building these type of switches ? Are they/would they be much more expensive than a regular switch which has a more 'standard' processor and is ...
yoyo_fun's user avatar
  • 1,531
1 vote
1 answer
1k views

How "show inventory" displays SX SFP?

I've a Cisco 3925 and it's not quite clear why an "1000BASE-SX SFP" entry is visible in the inventory. Is it only visible when the SX SFP is in use? (I've no chance to modify it.) NAME: "CISCO3925-...
human374's user avatar
  • 383
-2 votes
1 answer
51 views

Hard drive array usage [closed]

I recently bought this EMC server rack, it's got a bunch of hard drive arrays which came with it. How do I use these? Seems a shame to throw them away. Are these just a sort of NAS that I could ...
Kilisi's user avatar
  • 99
2 votes
1 answer
4k views

How to hard reset an Allied Telesis x510?

I have a newly opened from the box Allied Telesis Port. After some configuration, I was locked out due to timed out. I have already setup the Login with correct login and managed to login before. ...
Mohd Nasrul Iwan Fajaruddin's user avatar
15 votes
3 answers
40k views

What is the purpose of an Ethernet magnetic transformer, and how are they used?

I have been told that Ethernet magnetic transformers are used for base-t Ethernet when transmission is sent over a lengthy cable. What is the purpose of the transformer? (is it for signal filtering or ...
Benjamin's user avatar
  • 151
5 votes
1 answer
281 views

What happens at the hardware level of a router when a packet is received and eventually triggers a process like ARP?

Please let me know where the gaps in my understanding are. There are many gaps, so please do not hesitate to fill them in or correct them. To my knowledge, what happens on the hardware level when ...
beckah's user avatar
  • 303
5 votes
1 answer
19k views

How do hardware timestamps (hardstamps) work

I am currently diving into topics like PTP (IEEE 1588) and precise timestamping for capturing network traffic. Many resources on the Internet name hardstamps as a feature of network cards, allowing ...
Netzdoktor's user avatar