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參數(shù)資料
| 型號： | T7121 |
| 英文描述： | T7121 HDLC Interface for ISDN |
| 中文描述： | T7121的HDLC接口用于ISDN |
| 文件頁數(shù)： | 16/68頁 |
| 文件大?。?/td> | 685K |
| 代理商： | T7121 |
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16
Lucent Technologies Inc.
Data Sheet
April 1997
T7121 HDLC Interface for ISDN (HIFI-64)
Functional Description
(continued)
Bit Masking
When in the TDM highway mode (HWYEN, R0—B7 = 1), the HIFI-64 can be programmed to mask any combina-
tion of bits in a byte. As an example, this feature is used to process 16 kbits/s D-channel data where only 2 bits in
each byte are looked at when receiving, and where only 2 bits are transmitted during an 8-bit time slot. Using this
option, the HIFI-64 is able to support effective intermediate data rates of 8, 16, 24, 32, 40, 48, and 56 kbits/s.
The receiver ignores bit positions that are masked (cleared to 0) in the receiver bit mask register (R12). The trans-
mitter outputs high impedance (3-state) during the bit times specified (cleared to 0) in the transmitter bit mask reg-
ister (R13). The user can program any combination of bits to be masked in the receiver and transmitter
independently.
Upon chip reset, the default is as follows:
1. The receiver defaults to recognize all incoming data as valid (i.e., no masking).
2. The transmitter defaults to a state where all bits are masked.
The user must unmask the bits to be transmitted. This eliminates the problem of the HIFI-64 transmitting before the
time slot has been programmed in registers 7, 9, and 10.
Figures 8 and 9 show how 16 kbits/s operation is achieved by using the bit-masking option.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| T7121-EL2 | T7121 HDLC Interface for ISDN |
| T7121-PL2 | T7121 HDLC Interface for ISDN |
| T7121 | HDLC Interface for ISDN (HIFI-64)(應(yīng)用于ISDN的HDLC（高階數(shù)據(jù)鏈路）接口) |
| T7502 | T7502 Dual PCM Codec with Filters |
| T7503 | T7503 Dual PCM Codec with Filters |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| T7-121A1 | 制造商:OTTO 功能描述:Toggle Switches ON NONE OFF 1 Pole Standard Bat Handle 制造商:OTTO Engineering Inc 功能描述:Switch Toggle ON None OFF SPST Bat Toggle Screw 16A 115VAC 28VDC Panel Mount with Threads |
| T7-121A2D | 制造商:OTTO 功能描述:Toggle Switches ON NONE OFF 1 Pole Standard LeverLock 制造商:OTTO Engineering Inc 功能描述:1 POLE, SCREW, STD, |
| T7-121A2G | 功能描述:撥動開關(guān) ON NONE OFF 1 Pole Standard LeverLock RoHS:否 制造商:OTTO 觸點(diǎn)形式: 開關(guān)功能: 電流額定值: 電壓額定值 AC: 電壓額定值 DC: 功率額定值: 端接類型: 安裝風(fēng)格: 端子密封: 觸點(diǎn)電鍍: 照明: |
| T7-121A5 | 制造商:OTTO 功能描述:Toggle Switches ON NONE OFF 1 Pole Standard Bat Handle 制造商:OTTO Engineering Inc 功能描述:Switch Toggle ON None OFF SPST Bat Toggle Screw 16A 115VAC 28VDC Panel Mount with Threads |
| T7-121B1 | 功能描述:撥動開關(guān) ON NONE ON 1 Pole Standard Bat Handle RoHS:否 制造商:OTTO 觸點(diǎn)形式: 開關(guān)功能: 電流額定值: 電壓額定值 AC: 電壓額定值 DC: 功率額定值: 端接類型: 安裝風(fēng)格: 端子密封: 觸點(diǎn)電鍍: 照明: |
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