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. TSCLK[N] is held low during the FAS and NFAS framing bytes. The
most significant bit of time-slot 1 is placed on TSDATA[N] on the last falling edge of
TSCLK[N] ahead of the extended low period. 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. TSCLK[N] is held low during the framing bit. The MSB of time-slot 1 is placed
on TSDATA[N] on the last falling edge of TSCLK[N] ahead of the extended low period.
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
148
PMC [ PMC-SIERRA, INC ]
