STANDARD PRODUCT
PM4351 COMET
DATA SHEET
PMC-1970624
ISSUE 10
COMBINED E1/T1 TRANSCEIVER
Input Transmit Data
Bit Settings
OCLKSEL1=0
OCLKSEL0=0
PLLREF1=1
PLLREF0=0
LINELB=0
Effect on Output Transmit Data
Synchronous to BTCLK output.
Jitter attenuated looptiming. TCLKO is a smooth
1.544 MHz or 2.048 MHz.
Transmit Backplane Configuration
register CMODE =0.
Loop timed to the receive recovered clock. TX-ELST
bypassed.
TXELSTBYP=1
OCLKSEL1=0
OCLKSEL0=0
PLLREF1=1
PLLREF0=0
LINELB=0
Synchronous to BTCLK input.
Jitter attenuated looptiming. TCLKO is a smooth
1.544 MHz or 2.048 MHz.
Transmit Backplane Configuration
register CMODE =1.
Loop timed to the receive recovered clock. TX-ELST
allows BTCLK to be plesiochronous.
TXELSTBYP=0
OCLKSEL1=0
OCLKSEL0=0
PLLREF1=1
PLLREF0=1
LINELB=0
Synchronous to BTCLK output.
Jitter attenuated. TCLKO is a smooth 1.544 MHz or
2.048 MHz. TCLKO and BTCLK referenced to TCLKI
input. TX-ELST bypassed.
Transmit Backplane Configuration
register CMODE =0.
TXELSTBYP=1
OCLKSEL1=0
OCLKSEL0=0
PLLREF1=1
PLLREF0=1
LINELB=0
Synchronous to BTCLK input.
Jitter attenuated. TCLKO is a smooth 1.544 MHz or
2.048 MHz. TCLKO referenced to TCLKI input. TX-
ELST allows BTCLK to be plesiochronous.
Transmit Backplane Configuration
register CMODE =1.
TXELSTBYP=0
OCLKSEL1=1
OCLKSEL0=X
PLLREF1=1
PLLREF0=1
LINELB=0
Synchronous to BTCLK input.
Transmit Backplane Configuration
register CMODE =1.
No jitter attenuation. TCLKO is equivalent to BTCLK.
TX-ELST bypassed.
TXELSTBYP=1
PROPRIETARY AND CONFIDENTIAL
92
PMC [ PMC-SIERRA, INC ]
