TMXF28155 Datasheet, PDF (296/606 Pages) Agere Systems – TMXF28155 Super Mapper 155/51 Mbits/s SONET/SDH x28/x21 DS1/E1

TMXF28155/51 Super Mapper
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
Preliminary Data Sheet
May 2001
12 28-Channel Framer Registers (continued)
Table 422. FRM_ARLR2, Arbiter Link Register 2 (R/W)
Address* Bit
Name
Function
0x8LPF1 15 FRM_ESF_CRC_EN CRC Framing Enable.
Reset
Default
0
DS1 Modes: ESF CRC framing algorithm enable:
0 = ESF CRC framing disabled.
1 = ESF CRC framing enabled. (Enables inclusion of CRC
in the frame search algorithm.)
CEPT Modes: CRC-4 Multiframe:
0 = Multiframe reframe disabled.
1 = Multiframe reframe enabled. (Enables the inclusion of
the following criteria to the CEPT loss of multiframe crite-
ria. Three consecutive multiframe alignment pattern bit
errors will cause a search for a new multiframe alignment.
Basic frame alignment is not lost.)
14
FRM_FAST
Fast Frame Mode.
0
DS1 Modes:
0 = Disable quick frame recovery.
1 = Enable quick frame recovery as follows:
D4 and J-D4: 36 fewer frame bits are checked.
SLC-96: Eighteen fewer FT bits are checked during the
search for FT framing.
DDS: No change.
CEPT Modes:
0 = Disable quick frame recovery.
1 = This bit enables the (n + 2) framing research algorithm
as defined in the note in Recommendation G.706 section
4.1.2. When an FAS is found in frame n, frame (n + 1) is
checked to ensure that it is a non-FAS frame and frame
(n + 2) is checked for FAS. Failure to meet either of these
conditions results in a new search in frame (n + 2).
* See Table 417 for values of L and P.
296
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