PM7347 Datasheet, PDF (270/341 Pages) PMC-Sierra, Inc – SATURN USER NETWORK INTERFACE for J2/E3/T3

S/UNI®-JET Data Sheet
Released
13.6
Control Bit
Jk: Tributary
Justification Bits
Transmit Operation
When the device is
configured as a E3 G.751
framer, the Tributary
Justification Bits can be
inserted on the TDATI input
pin the same way as normal
payload data.
When the device is
configured for ATM
application, the Tributary
Justification Bits are used a
payload bits.
G.832 E3 Frame Format
Receive Operation
Extracts the Tributary Justification Bits on the
ROH output pin when the Jk bits are
configured as overhead.
The S/UNI-JET provides support for the G.832 E3 frame format. This format can be extended to
allow for direct byte mapping of ATM cells. The G.832 E3 frame format is shown in Figure 14.
Figure 14 G.832 E3 Frame Structure
59 colum ns
FA1 FA2
EM
TR
MA
NR
GC
530 octet payload
The processing of the overhead bits in the G.832 E3 frame is described in Table 40. In the
transmit direction, the overhead bits can be inserted on a bit-by-bit basis from a user supplied data
stream using the TOH, TOHINS, TOHFP, and TOHCLK signals. In the receive direction, the
overhead bits are brought out serially on the ROH data stream.
Table 40 G.832 E3 Frame Overhead Operation
Control
FA1, FA2:
Frame Alignment Pattern
Transmit Operation
Inserts the G.832 E3 frame
alignment pattern (F628H).
Receive Operation
Searches the receive stream for the G.832 E3
frame alignment pattern. When the pattern is
detected for two consecutive frames, an in-
frame condition is declared. Note: There is no
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Document ID: PMC-1990267, Issue 3