XRT72L56 Datasheet, PDF (438/486 Pages) Exar Corporation – SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

XRT72L56
SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.2
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PRELIMINARY
tion of the Local Transmit E3 Framer block, which will
transmit an E3 frame to the Remote Terminal, with
the FEBE bit-field set to “0” . This signaling indicates
that the Local Receive E3 Framer has received an er-
ror-free E3 frame.
FIGURE 196. ILLUSTRATION OF THE LOCAL RECEIVE E3 FRAMER BLOCK, RECEIVING AN E3 FRAME (FROM THE
REMOTE TERMINAL) WITH A CORRECT EM BYTE.
Local Terminal
Transmit E3
Framer
Receive E3
Framer
EM Byte
0x5A
0x5A
Locally Calculated
EM Byte
Remote
Terminal
FIGURE 197. ILLUSTRATION OF THE LOCAL RECEIVE E3 FRAMER BLOCK, TRANSMITTING AN E3 FRAME (TO THE
REMOTE TERMINAL) WITH THE FEBE BIT (WITHIN THE MA BYTE-FIELD) SET TO “0”
Local Terminal
FEBE bit
x0xxxxxx
Transmit E3
Framer
Receive E3
Framer
MA Byte
Remote
Terminal
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