PRELIMINARY
PM4318 OCTLIU
DATASHEET
PMC- 2001578
ISSUE 3
OCTAL E1/T1/J1 LINE INTERFACE DEVICE
Figure 17 – Transmit Timing Options
1
0
Transmit data out
Transmit data in
TJA TBY P
Transmit line clock
TJAT
FIFO
OCLKSEL OR TJATBYP
0
TCLK[n] / SBI transmit clock
0
FIFO input
data clock
FIFO output
data clock
1
LINELB
1
"Jitter-free" line rate clock
00
(1.544MHz or 2.048MHz)
Receive recovered clock
CSU transmit clock
01
1X
TJAT
PLL
24x line rate clock
for pulse generation
PLLREF
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
75