RELEASED
PM73123 AAL1GATOR-8
DATASHEET
PMC-2000097
ISSUE 2
8 LINK CES/DBCES AAL1 SAR
constant signaling for an entire multi-frame, then the multi-frame sync signal is
not required unless there is a desire to synchronize the multi-frame with the data
across the network. In general this is not necessary.
The AAL1gator-8 reads the signaling nibble for each channel when it reads the
last nibble of each channel’s data. See Figure 71 for an example of a T1 frame.
See Figure 72 for an example of an E1 frame.
Figure 71 Capture of T1 Signaling Bits
Line Signals During the Last Frame of a
RL_SER
1
2
3
...
22
23
ABCD
24
(timeslots
)
ABCD
XXXX
Channel 1
ABCD
ABCD
ABCD
ABCD
XXXX
XXXX
RL_SIG
XXXX
...
XXXX
XXXX
...
Channel 2
Channel 21
Channel 22
Channel 23
Channel 0
XXXX - indicates signaling is
Figure 72 Capture of E1 Signaling Bits
Line Signals During the Last Frame of a Multiframe
RL_SER
(t imeslots
...
0
1
2
29
30
ABCD
31
ABCD
XXXX
Channel 31
)
ABCD
Channel 0
ABCD ABCD
XXXX
Channel 1 Channel 2
ABCD
XXXX Channel 29 XXXX
XXXX
XXXX
...
...
RL_SIG
Channel30
XXXX - indicates signaling is ignored
Note:
AAL1gator-8 treats all 32 timeslots identically. Although E1 data streams contain
30 timeslots of channel data, 1 timeslot of framing (timeslot 0) and one time slot
that can either be signaling or data (time slot 16), data and signaling for all 32
timeslots are stored in memory and can be sent and received in cells.
9.6.3 Transmit Direction
In the line transmit direction, for structured data, the Line Interface Block may
take the TL_SYNC input signal and depending on the value of
MF_SYNC_MODE interpret the signal as either a frame pulse or multi-frame
pulse. Alternatively if GEN_SYNC in LIN_STR_MODE memory register is high
for that line, then the Line Interface Block will take the frame pulse or multi-
frame pulse generated by the A1SP Block for the local link and output that signal
to the TL_SYNC[n] pin on the external lines. Whether the Line Interface Block
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