參數(shù)資料
型號: T7121-PL2
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): 26/68頁
文件大小: 685K
代理商: T7121-PL2
26
Lucent Technologies Inc.
Data Sheet
April 1997
T7121 HDLC Interface for ISDN (HIFI-64)
Functional Description
(continued)
In the local loopback mode:
I
CLKRI (R9—B0) must equal CLKXI (R9—B4). We recommend changing CLKRI to match CLKXI (other highway
parameters need not be altered).
I
CLKX clocks both the transmitter and the receiver.
I
The transmitter and receiver must both be enabled. The transmitter output is internally connected to the receiver
input.
I
The DXA and DXB outputs are active, depending on DXAC and DXBC.
I
The DRA or DRB input is ignored.
I
The communication between the transmit and receive FIFO buffers and the microprocessor continues normally.
5-5036
Figure 10. Local Loopback Mode
HDLC
CHI
DATA TO BE
TRANSMITTED
TRANSMITTER
DXA
DXB
(USER-SELECTED)
FIFO
HDLC
CHI
DRA
OR
DRB
(IGNORED)
FIFO
RECEIVER
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