Hayes-microcomputer-products PC Card Instrukcja Użytkownika Strona 6
- Strona / 57
- Spis treści
- BOOKMARKI
Oceniono. / 5. Na podstawie oceny klientów
DIVA T/A PC Card Reference Guide 6
ISDN Communication Channels
In the ISDN interface, a number of communication channels are
carried over a digital line. These communication channels can vary by
the type of information they transmit and by the transmission speed
they support. The number and type of channels used may vary.
The communication channels can be of the following types:
B-Channel - 64 Kbps
D-Channel - 16 or 64 Kbps
H-Channel - 384, 1536, or 1920 Kbps (not yet commercially
available)
Different combinations of these channels are used to support different
types of usage (e.g., basic, primary and broadband).
B-Channel
The B-channel is a user (bearer) channel which carries a subscriber’s
digital traffic (e.g. digitized video, voice, audio, or digital data, or
perhaps a mixture). The bandwidth of this channel is 64 Kbps. The
control signals used to set up the connection, however, are not sent
over the B-channel. The call establishment is done on the D-channel
using common-channel signaling. This concept will be discussed
shortly.
Two kinds of connections can be established over a B-channel:
Circuit-Switched
Packet-Switched
Circuit-switched connections are ideal for voice traffic for several
reasons. Voice data is “delay-sensitive”, meaning that it must not be
delayed, and that it must be received in the order in which it was
transmitted. There is a call set-up time that is characteristic of circuit-
switched connections. This time lag is quite acceptable when
measured against the length of a typical telephone call.
In a packet-switched data network or PSDN, data to be transmitted is
broken up into individual units called packets that are then routed
from sender to receiver. The sender/receiver can be any type of
terminal, printer, computer or other device that supports an interface
to the network.
- DIVA T/A PC Card 1
- Reference Guide 1
- Table of Contents 3
- What is ISDN? 4
- Benefits 5
- ISDN Communication Channels 6
- D-Channel 7
- H-Channel 7
- Basic Rate Access 7
- Primary Rate Access 7
- What is EZ-ISDN/IOC? 8
- What is AutoSPID? 9
- What is Multilink PPP? 11
- What is BACP/BOD? 12
- What is Data Compression? 13
- AT Commands 14
- AT Command Groups 15
- Commands 16
- General AT Commands 25
- General AT Commands—Continued 26
- ISDN Configuration Commands 29
- Command Description 30
- COM Port Configuration 34
- Call Control Commands 39
- V.120 Configuration Commands 42
- V.110 Configuration Commands 45
- Profile Commands 46
- Profile Commands—Continued 47
- Multilink PPP Commands 48
- Utility Commands 51
- Mini-monitor Commands 53
- AT Command Result Codes 54
- Word Message Description 56
Powiązane produkty i podręczniki dla Sprzęt komputerowy Hayes-microcomputer-products PC Card
(93 strony)Samsung CM1039 manuals
Owner’s manuals and user’s guides for DVD players Samsung CM1039.
We providing pdf manuals Samsung CM1039 for download free by document types:
Komentarze do niniejszej Instrukcji