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參數資料
型號: W6691
廠商: WINBOND ELECTRONICS CORP
英文描述: ISDN S/T Interface Transceiver
中文描述: 綜合業務數字網的S / T接口收發器
文件頁數: 42/106頁
文件大小: 428K
代理商: W6691
Preliminary W6691
Publication Release Date: Sep 2001
42 Revision 1.1
PXC
Connection
0
PCM1
B1, PCM2
B2
1
PCM1
B2, PCM2
B1
4. B2SW1 / B2SW0 B2 channel Switch
These two bits determine B2 channel switch among PCM port , Layer1/GCI and Layer2.
00: Select B2 channel switch between Layer2 and Layer1/GCI.
01: Select B2 channel switch between Layer1/GCI and PCM.
10: Select B2 channel switch between PCM and Layer2.
5. B1SW1 / B1SW0 B1 channel Switch
These two bits determine B1 channel switch among PCM port , Layer1/GCI and Layer2.
00: Select B1 channel switch between Layer2 and Layer1/GCI.
01: Select B1 channel switch between Layer1/GCI and PCM.
10: Select B1 channel switch between PCM and Layer2.
7.4 PCM Port
There are two PCM ports in W6691. Data is valid when respective PFCK is HIGH. The frame
synchronization clocks (PFCK1-2) are 8 kHz and the bit synchronization clock (PBCK) is 1.536 MHz.
7.5 D Channel HDLC Controller
There are two HDLC protocols that are used for ISDN layer 2 functions : LAPD and LAPB. Their frame
formats are shown below.
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