
XRT79L71
PRELIMINARY
507
1-CHANNEL DS3/E3 CLEAR-CHANNEL FRAMERLIU COMBO - CC/HDLC ARCHITECTURE
REV. P2.0.0
In response to this erred condition, the Transmit DS3/E3 Framer block within the Near-End Terminal will
respond by setting the FEBE/REI bit, within the very next outbound E3 frame, to the value "1" in order to
denote a FEBE/REI event. More specifically, the Transmit DS3/E3 Framer block within the Near-End Terminal
will transmit an E3 frame with the FEBE/REI bit-field set to "1" each time the corresponding Receive DS3/E3
Framer block also within the Near-End Terminal detects an EM byte error within an E3 frame. Figure 240 presents an illustration of the Transmit DS3/E3 Framer block sending the FEBE/REI indicator to the remote
terminal equipment.
For information on how the Receive DS3/E3 Framer block processes the FEBE bit-fields, within each incoming
The Transmit DS3/E3 Framer block provides the user with two options associated with transmitting the FEBE
indicator.
Forced transmission of the FEBE/REI indicator (e.g., under Software Control)
Automatic transmission of the FEBE/REI indicator in response to the Receive DS3/E3 Framer block
detecting EM byte errors
6.2.6.4.1
Forced Transmission of the FEBE/REI Indicator
FIGURE 239. A SIMPLE ILLUSTRATION OF A NEAR-END TERMINAL DETECTING EM BYTE ERRORS WITHIN ITS INCOM-
ING
E3 SIGNAL
FIGURE 240. A SIMPLE ILLUSTRATION OF THE NEAR-END TERMINAL EQUIPMENT TRANSMITTING THE FEBE/REI
INDICATOR TO THE REMOTE TERMINAL EQUIPMENT
Transmit E3
Framer
Receive E3
Framer
Near-End Terminal
Remote
Terminal
Equipment
Remote
Terminal
Equipment
EM Byte
Locally Calculated
EM Byte
0x5A
0x5B
Transmit E3
Framer
Receive E3
Framer
Near-End Terminal
Remote
Terminal
Equipment
Remote
Terminal
Equipment
MA Byte
x1xxxxxx
FEBE bit