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參數(shù)資料
| 型號(hào)： | 73D2348A |
| 廠商： | TDK Corporation |
| 英文描述： | MNP5, V.42bis Datacom Modem Device Set |
| 中文描述： | MNP5，V.42bis壓縮數(shù)據(jù)通信調(diào)制解調(diào)器設(shè)備集 |
| 文件頁數(shù)： | 3/9頁 |
| 文件大?。?/td> | 66K |
| 代理商： | 73D2348A |
73D2248A/2348A
MNP5, V.42bis Datacom
Modem Device Set
3
PROTOCOLS
Microcom Networking Protocol (MNP)
MNP4 is a protocol offering error control while MNP5
offers data compression. Data to be transmitted is
broken into blocks of varying sizes, depending on
line conditions, and sent to the remote modem along
with a 16-bit Cyclic Redundancy Check (CRC) word.
If the algorithm used to derive the CRC word at the
transmitter does not produce an identical word when
exercised on the received data, a line error is
assumed, and the block is repeated. Data
compression is obtained by transmitting a short set
of characters for a longer redundant set. At the
receiver, the short string is replaced with the longer
string that it represented, and the data stream is
returned to its original state.
CCITT V.42 AND V.42BIS
The CCITT has ratified a set of protocols which
operate in a manner similar to MNP. MNP4
corresponds to V.42 while MNP5 corresponds with
V.42bis. Greater efficiency is offered, but the
tradeoff is a larger memory space requirement.
MNP5 requires an 8K buffer, while V.42bis requires
32K. Data files which show compression ratios
approaching 2:1 with MNP5 may show ratios of
nearly 4:1 with V.42bis.
ADDITIONAL INFORMATION
The TDK Semiconductor Corporation 73D2248/2348
Design Manual defines the AT commands. Please
contact your local TDK Semiconductor Corporation's
sales office for a copy of the TDK Semiconductor
Corporation's Protocol Design Manual.
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