这个已经被验证的驱动是一个面向比特的保护电脑和数据终端
之间的数据传输安全的同步传输协议。它同时支持点对点和多
点操作。有两个可用的版本:
HDLC UNC-2
HDLC UNC-2工作在NRM(normal-response-mode),符合
DIN 66221 part 3,并且具有一下特征:半双工主从操作。在主站操作,多于30个的从站可以被定址。主站和从站的站点地址可任意配置。
HDLC UNC-2参数
Baud Rate |
1.200 Bit/s - 1 MBit/s (clock pulse controlled)
1.200 Bit/s - 38.400 Bit/s (clock pulse retrieval from receive data stream) |
Modem Operation |
on/off (leased line) |
Modem Watchdog |
1 - 255 ms |
Operating Mode |
master/slave |
Data Coding |
NRZ/NRZI |
Clock Pulse |
external/internal clock pulse |
Receiving/Sending Clock Pulse |
can be selected separately |
Coding |
NRZ/NRZI |
Clock Pulse Supply |
internal baud rate generator, external clock, pulse of remote
station or clock pulse, retrieval from receive data stream |
Frame Size |
128 - 1024 Bytes |
Window Size |
1 - 7 Frames |
HDLC BAC 2.8
HDLC BAC 2.8工作在符合DIN 66222的ABM(asynchronous balanced mode)模式。它以全双工的方式支持两个相似站点之间的点对点连接。该协议版本对应于符合ITU的LAP-B,并且支持在第二层中直接访问包交换网络。这个驱动已经通过了符合NET2的认证。
HDLC BAC 2.8参数
Data Coding |
NRZ/NRZI |
Baud Rate |
up to 1 MBit/s (clock pulse controlled) |
Clock Pulse Supply |
internal baud rate generator or external clock pulse of remote station |
Frame Size |
64 - 1024 Bytes |
Window Size |
1 - 7 Frames |
|