S/UNI-IMA-4 Telecom Standard Product Data Sheet
Released
E1
The E1 frame structure select bit (E1) configures link #N for channelized E1 operation
when CEN is set high. RSCLK[N] is held low during the FAS and NFAS framing bytes.
The data bit on RSDATA[N] that is associated with the first rising edge of RSCLK[N] after
an extended low period is considered to be the most significant bit of time-slot 1. Link data
is present at time-slots 1 to 31. When E1 is set low and CEN is set high, link #N is
configured for channelized T1 operation. RSCLK[N] is held low during the framing bit.
The data bit on RSDATA[N] that is associated with the first rising edge of RSCLK[N] after
an extended low period is considered to be the most significant bit of time-slot 1. Link data
is present at time-slots 1 to 24. E1 is ignored when CEN is set low.
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2020889, Issue 2
141
PMC [ PMC-SIERRA, INC ]
