Datasheet

DS2155
52 of 238
9.4 T1 Receive-Side Digital-Milliwatt Code Generation
Receive-side digital-milliwatt code generation involves using the receive digital-milliwatt registers
(T1RDMR1/2/3) to determine which of the 24 T1 channels of the T1 line going to the backplane should
be overwritten with a digital-milliwatt pattern. The digital-milliwatt code is an 8-byte repeating pattern
that represents a 1kHz sine wave (1E/0B/0B/1E/9E/8B/8B/9E). Each bit in the T1RDMRx registers
represents a particular channel. If a bit is set to a 1, then the receive data in that channel is replaced with
the digital-milliwatt code. If a bit is set to 0, no replacement occurs.
Register Name:
T1RDMR1
Register Description:
T1 Receive Digital-Milliwatt Enable Register 1
Register Address:
0Ch
Bit # 7 6 5 4 3 2 1 0
Name CH8 CH7 CH6 CH5 CH4 CH3 CH2 CH1
Default 0 0 0 0 0 0 0 0
Bits 0 to 7/Receive Digital-Milliwatt Enable for Channels 1 to 8 (CH1 to CH8)
0 = do not affect the receive data associated with this channel
1 = replace the receive data associated with this channel with digital-milliwatt code
Register Name:
T1RDMR2
Register Description:
T1 Receive Digital-Milliwatt Enable Register 2
Register Address:
0Dh
Bit # 7 6 5 4 3 2 1 0
Name CH16 CH15 CH14 CH13 CH12 CH11 CH10 CH9
Default 0 0 0 0 0 0 0 0
Bits 0 to 7/Receive Digital-Milliwatt Enable for Channels 9 to 16 (CH9 to CH16)
0 = do not affect the receive data associated with this channel
1 = replace the receive data associated with this channel with digital-milliwatt code
Register Name:
T1RDMR3
Register Description:
T1 Receive Digital-Milliwatt Enable Register 3
Register Address:
0Eh
Bit # 7 6 5 4 3 2 1 0
Name CH24 CH23 CH22 CH21 CH20 CH19 CH18 CH17
Default 0 0 0 0 0 0 0 0
Bits 0 to 7/Receive Digital-Milliwatt Enable for Channels 17 to 24 (CH17 to CH24)
0 = do not affect the receive data associated with this channel
1 = replace the receive data associated with this channel with digital-milliwatt code