SignaMax 065-7931 User's Guide Page 37
- Page / 109
- Table of contents
- BOOKMARKS
Rated. / 5. Based on customer reviews
Signamax 065-7931 16-Port 10/100/1000BaseT/TX WebSmart Switch
29
How does a MAC work?
The MAC sub-layer has two primary jobs to do:
1. Receiving and transmitting data. When receiving data, it parses frames to
detect errors; when transmitting data, it performs frame assembly.
2. Performing Media access control. It prepares the initiation jobs for a
frame transmission and facilitates recovery from transmission failure.
Frame transmission
As Ethernet adopted Carrier Sense Multiple Access with Collision Detect
(CSMA/CD) as its operating protocol, it detects if there is any carrier signal from
another network device running over the physical medium when a frame is ready for
transmission. This is referred to as sensing carrier, also “Listen”. If there is signal on
the medium, the MAC defers the traffic to avoid a transmission collision and waits
for a random period of time, called backoff time, then sends the traffic again.
After the frame is assembled, when transmitting the frame, the preamble
(PRE) bytes are inserted and sent first, then the next, Start of Frame Delimiter
(SFD), DA, SA and through the data field and FCS field in turn. The following
summarizes what a MAC does before transmitting a frame.
1. MAC will assemble the frame. First, the preamble and Start-of-
Frame delimiter will be put in the fields of PRE and SFD, followed
DA, SA, tag ID if tagged VLAN is applied, either type or the value
of the data length, and payload data field, and finally put the FCS
data in order into the responded fields.
2. Listen if there is any traffic running over the medium. If yes, wait.
3. If the medium is quiet, and no longer senses any carrier, the
MAC waits for a period of time, i.e. inter-frame gap time to have
the MAC ready with enough time and then start transmitting the
frame.
4. During the transmission, MAC keeps monitoring the status of the
medium. If no collision happens until the end of the frame, it
transmits successfully. If there is a collision happened, the MAC
will send the patterned jamming bit to guarantee the collision
event is propagated to all involved network devices, and then
wait for a random period of time, i.e. backoff time. When backoff
time expires, the MAC goes back to the beginning state and
attempts to transmit again. After a collision happens, MAC
increases the transmission attempts. If the count of the
transmission attempt reaches 16 times, the frame in the MAC’s
queue will be discarded.
- U s e r’s G u i d e 1
- Table of Contents 4
- Revision History 6
- About this user’s manual 9
- 1. Introduction 10
- 1-2. Checklist 11
- 1-3. Features 11
- 2. Installation 16
- 2-1-2. Cabling Requirements 17
- 18
- Ethernet LAN 23
- 2-1-4. IP Address Assignment 24
- 1 0000000 26
- 1 1111111 26
- Fig. 2-9 28
- 2-2. Typical Applications 29
- 3. Basic Concept and 31
- Management 31
- Table 3-2 33
- Table 3-1 LLC Format 33
- Fig. 3-2 SAP Format 34
- How does a MAC work? 37
- 64 bytes 38
- 3-3. Flow Control 40
- Table 3-5 42
- Fig.3-5 Collision Domain 44
- Fig. 3-6 45
- 3-5. Virtual LAN 47
- Fig. 3-8 48
- Fig.3-9 Tag Format 49
- Table 3-6 52
- Table 3-7 52
- 3-6. Link Aggregation 53
- 4. Operation of 55
- Web-based Management 55
- Page Layout Information 57
- 4-2. Configuration 58
- 4-2-1. System Configuration 59
- 4-2-2. Ports Configuration 62
- Fig. 4-4 63
- Fig. 4-5 65
- Fig. 4-7 68
- Fig. 4-8 68
- Fig. 4-9 69
- ;). Untag means the outgoing 70
- Fig. 4-10 71
- Fig. 4-11 72
- ;) under the 73
- Fig. 4-13 74
- Fig. 4-14 75
- Fig. 4-15 77
- Fig. 4-16 Advanced Mode 81
- Fig. 4-17 Simple Mode 81
- Fig. 4-18 82
- 4-2-9. Bandwidth Management 83
- Fig. 4-20 85
- 4-2-11. Max. Packet Length 86
- 4-3. Monitoring 87
- 4-3-2. Detailed Statistics 88
- Fig. 4-23 90
- 4-4-1. Status 91
- Fig. 4-25 94
- Fig. 4-27 Tag-based VLAN 97
- Fig. 4-31 100
- Fig. 4-32 101
- 4-4-2. Warm Restart 102
- 4-4-3. Factory Default 103
- 4-4-4. Logout 104
- 5. Maintenance 105
- Technical Specifications 106
- Appendix A 106
- Hardware Specifications 107
Related products and manuals for Network switches SignaMax 065-7931
Network switches SignaMax 065-7434 User Manual
(120 pages)
(120 pages)
Network switches SignaMax 065-7727S User's Guide
(287 pages)
(287 pages)
Network switches SignaMax 065-7861 User Manual
(284 pages)
(284 pages)
Network switches SignaMax 065-7841 User's Guide
(303 pages)
(303 pages)
© 2020, manymanuals.com. All rights reserved. | 0.276 s |
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comments to this Manuals