�����w�Ȃ�
LAN
Local Area Network
LAN �̃g�|���W�[
- �o�X�^
- �����O�^
- ��(�X�^�[)�^
���ۂ�LAN(���m��w)
Ethernet (IEEE 802.3)
- CSMA/CD (Carrier Sense Multiple Access / Collosion Detect)
= �����̃A�N�Z�X�|�C���g���L�����A�g�����o�A�Փ˂����m����B
�ǂ��f�[�^�𑗂낤�Ƃ���Ƃ�
- �l�b�g���[�N�ɐM��������Ă��Ȃ����ǂ����u�����āv���ׂ�
- �M��������Ă���ꍇ�́u�ҋ@����v
- �M��������Ă��Ȃ��ꍇ�́u����v
- �����ɂQ�̋ǂ����낤�Ƃ���Ɓu�Փˁv���N����
- �Փ˂����m������ABackoff �A���S���Y���ɂ��ҋ@���Ԃ����肷��
- �ҋ@��u�đ��v�����݂�
�����^(broadcast)�l�b�g���[�N
- �S�Ắu�ǁv�̓l�b�g���[�N�ɗ����S�Ă̐M��������
- �������Ẵp�P�b�g�ł��邩�ǂ����ׂ�
- �������Ăł���A��ʂ̑w�փf�[�^���n�����
- Ethernet �� IEEE 802.3 �̈Ⴂ
| Ethernet | OSI Layer 1 & 2 |
| IEEE 802.3 | OSI Layer 1 + Channel Access |
- 10Mbps
- 10BASE-5, 10BASE-2, 10BASE-T
| preamble | SOF | �\�[�X | ���� | �^�C�v/���� | �E�E�E�f�[�^�E�E�E | FCS |
| 7 | 1 | 6 | 6 | 2 | 46 �` 1500 | 4 |
- Preamble ...
1 0 �����݂Ɍ����
- Start Of Frame ... 10101011
- 48�r�b�g(6�I�N�e�b�g)��Ethernet address
�A�h���X��(�����Ƃ���)�n�[�h�E�F�A�ɑg�ݍ��܂�� ...
���[�J�ɏ�ʃA�h���X���蓖��
�u���[�h�L���X�g = ���� FF:FF:FF:FF:FF:FF (�S��1)
- IP �̏ꍇ �^�C�v�� 0x0800 (RFC894)
- Frame Check Sequence ... Cyclic Redundancy Check
- Ref.1
Ref.2
FDDI
Fiber Distributed Data Interface
- Token Ring (IEEE 802.5) �̋Z�p�� 100Mbps ���t�@�C�o�[�ɉ��p
���[�v�^�̘_���g�|���W�[���������l�b�g���[�N
- �l�b�g���[�N�Ɍq������ node �� token (�D) ������ node �ɓ`����
- token �������� node �́u���M���v������
- ����ׂ����������Ȃ���� token �����ɓn��
- ������ token �̑���Ɏ��ɓn��
- �������ĂłȂ����͎��֓n��
- �������������Ăł���Ώ�ʂ̑w�֓n��
�܂������������Ď��� node �֓n��
- ���M�҂͎��������m�F���ď���j�����Atoken �����֓n��
- ���t�@�C�o�[�P�[�u�� Single mode / Multi mode
- FDDI �̎d�l
- Media Access Control
- Physical Layer Protocol
- Physical Layer Medium
- Station Management
- �Q�d�̃����O ... �݂��ɔ��Ή��B��E�������O
Single-attachment station (SAS) -- Concentrator �������
Double-attachment station (DAS) �Q�d�����O�ɑΉ�
- ��Q�ւ̑Ή�
�����O�� node ���̏Ⴕ���� ... �Q�d�����O��܂�Ԃ��ĂP�d�ɂ���
�������� node ���̏Ⴕ���� ... �l�b�g���[�N�̕���������
������h�����߂� ... ���o�C�p�X�X�C�b�`
- Frame format
| Preamble | Start Delimiter | Frame Control | ���� | ���M�� | Data | FCS | End Delimiter | Frame Status |
| 1 | 1 | 6 | 6 | > 0 | 4 | 1 | 1 |
- Ref
ATM
Ref
WAN
��{�I�ɂ� Point-to-Point �ڑ��B(Serial Line)
Modem/Telephone-Line
[PC]<- RS-232-C ->[Modem]<- �d�b��� ->[Modem]<- RS-232-C ->[WS]
RS-232-C
25 pin connector (DB-25) / 9pin connector (DOS/V)
�[�����m�̐ڑ��� cross cable
�[���ƃ��f���̐ڑ��� straight cable
| 1 | FG | �A�[�X |
| 2 | SD | ���M�f�[�^ |
| 3 | RD | ��M�f�[�^ |
| 4 | RS | ���M�v�� |
| 5 | CS | ���M�� |
| 6 | DR | DCE Ready |
| 7 | SG | �M���p�ڒn |
| 20 | DR | DTE Ready |
��������
start / �f�[�^(7/8bit) / (Parity) / stop(1/2bit)
�t���[����
JIS/ASCII ����
| | | | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 |
| | | | 0 | 0 | 1 | 1 | 0 | 0 | 1 | 1 |
| | | | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 |
| 0 | 0 | 0 | 0 | NUL | DLE | SP | 0 | @ | P | ` | p |
| 0 | 0 | 0 | 1 | SOH | DC1 | ! | 1 | A | Q | a | q |
| 0 | 0 | 1 | 0 | STX | DC2 | " | 2 | B | R | b | r |
| 0 | 0 | 1 | 1 | ETX | DC3 | # | 3 | C | S | c | s |
| 0 | 1 | 0 | 0 | EOT | DC4 | $ | 4 | D | T | d | t |
| 0 | 1 | 0 | 1 | ENQ | NAK | % | 5 | E | U | e | u |
| 0 | 1 | 1 | 0 | ACK | SYN | & | 6 | F | V | f | v |
| 0 | 1 | 1 | 1 | BEL | ETB | ' | 7 | G | W | g | w |
| 1 | 0 | 0 | 0 | BS | CAN | ( | 8 | H | X | h | x |
| 1 | 0 | 0 | 1 | HT | EM | ) | 8 | I | Y | i | y |
| 1 | 0 | 1 | 0 | LF | SUB | * | : | J | Z | j | z |
| 1 | 0 | 1 | 1 | VT | ESC | + | ; | K | [ | k | { |
| 1 | 1 | 0 | 0 | FF | IS4 | , | < | L | \ | l | | |
| 1 | 1 | 0 | 1 | CR | IS3 | - | = | M | ] | m | } |
| 1 | 1 | 1 | 0 | SO | IS2 | . | > | N | ^ | n | ~ |
| 1 | 1 | 1 | 1 | SI | IS1 | / | ? | O | _ | o | DEL |
Ref
