tmxf28155 ETC-unknow, tmxf28155 Datasheet - Page 369

• Manufacturer Part Number: tmxf28155
• Description: Tmxf28155 Super Mapper 155/51 Mbits/s Sonet/sdh X28/x21 Ds1/e1
• Manufacturer: ETC-unknow

Preliminary Data Sheet
May 2001
17 TMUX Functional Description
17.5.1 Input Clock and Loss-of-Signal Monitoring
The TMUX detects and reports the loss of the 155 MHz input clock for STS-3 mode and the loss of the
51.84 MHz clock for STS-1 mode with register bits TMUX_RHSILOC—state
TMUX_RHSILOCD—delta state
starting on page
microprocessor clock as its reference.
The TMUX will detect and report a loss-of-signal condition with register bits TMUX_RHSLOS—state
page
(Table 86 on page88
all-zeros/ones pattern for 51.44 ns to 105 µs in 51.44 ns steps before data is descrambled. The detection time is
determined by the value programmed in register bits, TMUX_LOSDETCNT[10:0]
state will clear after reception of two consecutive receive frames with the correct framing pattern spaced 125 µs
apart without an incoming LOS all-zeros/ones pattern. This recovery applies to both internal and external LOS fail-
ure causes.
17.5.2 High-Speed Loopback Select Logic
The device can be configured to loopback the transmit STS-3/STM-1 (AU-4) TMUX_THS2RHSLB = 1
page
17.5.3 Frame Alignment—STS-3/STM-1 (AU-4) Framing or STS-1 Framing
The device will frame on the incoming signal. The state of the framer, out of frame (OOF) (register bit
TMUX_RHSOOF, see
delta state, see
will be reported.
The 32-bit (A1-2, A1-3, A2-1, and A2-2) framing pattern will be used in the frame detection for the
STS-3/STM-1 case and a 16-bit pattern will be used for the STS-1 case. The device will be considered out of frame
until two successive framing patterns separated in time by 125 µs occur without framing byte errors.
The device will be considered in frame until five successive frames, separated in time by 125 µs, occur with errored
framing patterns. If the framer transitions to the out of frame state, the framer will remain synchronized to the last
known frame boundary or the latest detected unerrored framing pattern.
A loss of frame (LOF) (register bit TMUX_RHSLOF; see
this state (register bits TMUX_RHSLOFD—delta state, see
interrupt mask; see
both types of input data, STS-3/STM-1 or STS-1.
The device will be considered in the LOF state when an OOF condition persists for 24 consecutive frames (3 ms).
The device will transition out of the LOF state after receiving 24 consecutive frames with the correct framing pat-
terns spaced 125 µs apart and the OOF condition is clear.
17.5.4 B1 BIP-8 Check
A BIP-8 even parity will be computed over all the incoming bits of the STS-3/STM-1 frame (STS-1 frame in STS-1
mode), which are scrambled (except for the bits in the A1, A2, and J0/Z0 bytes) and compared to the B1 byte
received in the next frame.
The total number of B1 BIP-8 bit errors (raw count), or block errors (as determined by register bit
TMUX_BITBLKB1; see
signal as configured in the microprocessor interface block, the raw count will be reset to zero and the value trans-
ferred to a 16-bit counter for B1 error counts B1ECNT[15:0]
Agere Systems Inc.
92), TMUX_RHSLOSD—delta state
94) or accept the local STS-3/STM-1 (AU-4) signal TMUX_THS2RHSLB = 0.
Table 91, starting on pag e92
92). LOC is determined by a stuck high or stuck low for a time greater than 10 µs and uses the
Table 86 on page88
), by monitoring the external input signal pin, LOSEXT (pin AE5), or detecting a continuous
Table 91 on page92
Table 95 on page
(Table 91, starting on page
) will be reported. These state and mask and delta bits are the same for
95), are counted. Upon the assertion of the performance monitor control
(Table 91, starting on pag
) as well as any changes to this state (register bits TMUX_RHSOOFD—
and TMUX_RHSOOFM—interrupt mask; see
(continued)
Table 91 on page
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
Table 91, starting on page92
(Table 124 on pag
92), TMUX_RHSILOCM—interrupt mask
e92), TMUX_RHSLOSM—interrupt mask
92) state bit as well as any changes to
(Table 91, starting on page92
TMXF28155/51 Super Mapper
e118).
(Table 97 on pag
, TMUX_RHSLOFM—
Table 86 on page88
e97). The LOS
(Table 91 on
(Table 93 on
(Table 91,
),
369
)