RELEASED
PM73123 AAL1GATOR-8
DATASHEET
PMC-2000097
ISSUE 2
8 LINK CES/DBCES AAL1 SAR
The AAL1gator-8 reads the signaling nibble for each channel when it reads the
last nibble of each channel’s data unless the SHIFT_CAS bit in the
LIN_STR_MODE register is set. If the SHIFT_CAS bit is set then the AAL1gator-
8 reads the signaling nibble for each channel when it reads the first nibble of
each channel’s data. See Figure 7 for an example of a T1 frame. See Figure 8
for an example of an E1 frame.
Figure 7 Capture of T1 Signaling Bits (SHIFT_CAS=0)
Line Signals During the Last Frame of a Multiframe
RL_SER
...
0
1
2
21
22
23
ABCD ABCD
XXXX Channel 21 XXXX Channel22 XXXX
Channel 23
(t imeslots
)
ABCD
XXXX
Channel 1
ABCD
ABCD
XXXX
Channel 2
ABCD
XXXX
...
RL_SIG
...
Channel 0
XXXX - indicates signaling is ignored
Figure 8 Capture of E1 Signaling Bits (SHIFT_CAS=0)
Line Signals During the Last Frame of a Multiframe
RL_SER
...
0
1
2
29
30
31
ABCD ABCD
XXXX Channel 29 XXXX Channel30 XXXX
Channel 31
(t imeslots
)
ABCD
Channel 0
ABCD ABCD
XXXX
Channel 1 Channel 2
ABCD
XXXX
XXXX
...
...
RL_SIG
XXXX - indicates signaling is ignored
Note:
• AAL1gator-8 treats all 32 timeslots identically. Although E1 data streams
contain 30 timeslots of channel data and 2 timeslots of control (timeslots 0
and 16), data and signaling for all 32 timeslots are stored in memory and can
be sent and received in cells.
Unstructured data is received without regard to the byte alignment of data within
a frame and is placed in the frame buffer in the order in which it arrives. Figure 9
shows the basic components of the TFTC.
Figure 9 Transmit Frame Transfer Controller
PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL
76
PMC [ PMC-SIERRA, INC ]
