Datasheet

DS26303: 3.3V, T1/E1/J1, Short-Haul, Octal Line Interface Unit
12 of 101
NAME PIN TYPE FUNCTION
DIGITAL Tx/Rx
TPOS1/TDATA1 37
TPOS2/TDATA2 30
TPOS3/TDATA3 80
TPOS4/TDATA4 73
TPOS5/TDATA5 108
TPOS6/TDATA6 101
TPOS7/TDATA7 8
TPOS8/TDATA8 1
I
Transmit Positive-Data Input for Channel 1 to 8/Transmit Data
Input for Channel 1 to 8
TPOS[1:8]: When the DS26303 is configured in dual-rail mode, the
data input to TPOSn is output as a positive pulse on the line
(TTIPn and TRINGn) as follows:
TPOSn TNEGn Output Pulse
0 0 Space
0 1 Negative Pulse
1 0 Positive Pulse
1 1 Space
TDATA[1:8]: When the device is configured in single-rail mode,
NRZ data is input to TDATAn. The data is HDB3, B8ZS or AMI
encoded before being output to the line.
TNEG1 38
TNEG2 31
TNEG3 79
TNEG4 72
TNEG5 109
TNEG6 102
TNEG7 7
TNEG8 144
I
Transmit Negative Data for Channel 1 to 8. When the DS26303
is configured in dual-rail mode, the data input to TNEGn is output
as a negative pulse on the line (TTIPn and TRINGn) as follows:
TPOSn TNEGn Output Pulse
0 0 Space
0 1 Negative Pulse
1 0 Positive Pulse
1 1 Space
TCLK1 36
TCLK2 29
TCLK3 81
TCLK4 74
TCLK5 107
TCLK6 100
TCLK7 9
TCLK8 2
I
Transmit Clock for Channel 1 to 8. The transmit clock must be
1.544MHz for T1 or 2.048MHz for E1 mode. TCLKn is the clock
used to sample the data on TPOSn/TNEGn or TDATn on the
falling edge. TCLKn can be inverted.
If TCLKn is high for 16 or more MCLKs, then an all-ones signal is
transmitted on the corresponding line (TTIPn and TRINGn). When
TCLKn starts clocking again, normal operation will resume on the
corresponding line.
If TCLKn is low for 64 or more MCLKs, the corresponding
transmitter channel will power down and the line will be put into
high impedance. When TCLKn starts clocking again the
corresponding transmitter will power up, resume normal operation,
and the line will come out of high impedance.
RPOS1/RDATA1 40
RPOS2/RDATA2 33
RPOS3/RDATA3 77
RPOS4/RDATA4 70
RPOS5/RDATA5 111
RPOS6/RDATA6 104
RPOS7/RDATA7 5
RPOS8/RDATA8 142
O,
tri-state
Receive Positive-Data Output for Channel 1 to 8/Receive Data
Output for Channel 1 to 8
RPOS[1:8]: In dual-rail mode, this output indicates a positive pulse
on RTIPn/RRINGn. If a given receiver is in power-down mode, the
corresponding RPOSn pin is high impedance.
RDATA[1:8]: In single-rail mode, NRZ data is output to this pin.
Note: During an RLOS condition, the RPOSn/RDATAn output
remainactive.