Preliminary Data Sheet
October 2000
T7630 Dual T1/E1 5.0 V Short-Haul Terminator (Terminator II)
58
L Lucent Technologies Inc.
Frame Formats
(continued)
T1 Frame Recovery Alignment Algorithms
When in a loss of frame alignment state, the receive framer searches for a new frame alignment and forces its inter-
nal circuitry to this new alignment. The receive framer’s synchronization circuit inhibits realignment in T1 framing
formats when repetitive data patterns emulate the T1 frame alignment patterns. T1 frame synchronization will not
occur until all frame sequence emulating patterns disappear and only one valid pattern exists. The loss of frame
alignment state will always force a loss of superframe alignment state. Superframe alignment is established only
after frame alignment has been determined in the D4 and SLC-96 frame format. Table 27 gives the requirements
for establishing T1 frame and superframe alignment.
Table 27. T1 Frame Alignment Procedures
Frame Format
D4: Frame
Alignment Procedure
Using the F
T
frame position as the starting point, frame alignment is established
when 24 consecutive F
T
and F
S
frame bits, excluding the twelfth F
S
bit, (48 total
frames) are received error-free. Once frame alignment is established, then super-
frame alignment is determined.
After frame alignment is determined, two valid superframe bit sequences using the
F
S
bits must be received error-free to establish superframe alignment.
Using the F
T
frame position as the starting point, frame alignment is established
when 24 consecutive F
T
frame bits (48 total frames) are received error-free. Once
frame alignment is established, then superframe alignment is determined.
After frame alignment is determined, superframe alignment is established on the
first valid superframe bit sequence 000111000111.
Using the F
T
frame position as the starting point, frame alignment is established
when six consecutive F
T
/F
S
frame bits and the DDS FAS in time slot 24 are received
error-free. In the DDS format, there is no search for a superframe structure.
Frame and superframe alignment is established simultaneously using the F
E
fram-
ing bit. Alignment is established when 24 consecutive F
E
bits are received error-
free. Once frame/superframe alignment is established, the CRC-6 receive monitor is
enabled.
D4: Superframe
SLC-96: Frame
SLC-96: Superframe
DDS: Frame
ESF