參數(shù)資料
型號(hào): TNETA1600
廠商: Texas Instruments, Inc.
英文描述: SONET/SDH ATM Receiver/Transmitter for 622.08-Mit/s or 155.52-Mbit/s Operation(SONET/SDH ATM接收器/傳送器)
中文描述: SONET / SDH的自動(dòng)柜員機(jī)接收器/發(fā)送器為622.08,麻省理工學(xué)院/ s或155.52 - Mbit / s的操作(SONET / SDH的自動(dòng)柜員機(jī)接收器/傳送器)
文件頁(yè)數(shù): 35/54頁(yè)
文件大小: 1120K
代理商: TNETA1600
TNETA1600
SONET/SDH ATM RECEIVER/TRANSMITTER
FOR 622.08-MBIT/s OR 155.52-MBIT/s OPERATION
SDNS036 – FEBRUARY 1996
35
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
transmit-overhead RAM
The TNETA1600 retrieves the transmit-overhead bytes from the transmit-overhead RAM beginning at hex
address 400. During normal operation, the device calculates or sets the values of many of the transmit-overhead
bytes. However, the user can program the values of many overhead bytes through the controller interface. The
device also provides a serial-transmit data-communications port through which the data-communications
(D1– 12) and orderwire (E1 and E2) bytes can be input. When the device is placed in program mode, the user
can set the values of all the transport- and path-overhead bytes. When the device is returned to normal
operation, the device calculates or sets those bytes necessary to ensure the proper transmission of the frame.
Table 10 shows the transmit-overhead bytes and their addresses in the transmit-overhead RAM. If EN155 is
high, only every fourth address of the transport and path overhead is used (the three A1s are extracted from
addresses 400, 404, and 408).
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