cx29503 Mindspeed Technologies, cx29503 Datasheet - Page 192

• Manufacturer Part Number: cx29503
• Description: Cx29503 Broadband Access Multiplexer Data Sheet
• Manufacturer: Mindspeed Technologies

Register Description
0x75—Transmit Alarm Signal Configuration (TALM)
Unused and reserved bits should be written to 0.
AUTO_MYEL and
TMYEL
AUTO_US_AIS and
US_TAIS
8-62
—
7
RESERVED
Manual and Automatic Transmit Multiframe Yellow Alarm—Manual mode sends the alarm
for as long as TMYEL is active. Automatic mode sends the alarm for the duration of a receive
loss of multiframe alignment [MRED; addr: 049].
Manual and Automatic Upstream Transmit Alarm Indication Signal—When activated
manually (US_TAIS) or automatically (AUTO_US_AIS), the alarm formatter replaces all data
with an unchannelized, all-1s signal (AIS). This includes replacing data from the receiver
during Line Loopback [LLOOP; addr: 014]. Automatic mode sends the AIS for the duration of
Receive Loss Of Signal [RLOS; addr: 047].
Because the US_TAIS and AUTO_US_AIS bits effect the upstream data, these bits are only
applicable during a loopback condition. In normal operation, the AIS transmission is
automatically performed in the downstream direction using the AUTO_AIS bit in the Receive
Alarm Signal Condition register [addr: 045].
AIS transmission [TAIS, AUTO_AIS; addr: 075] does not affect transmit data that is looped
back to the receiver during Framer Loopback [FLOOP; addr: 014]. This allows both FLOOP
and LLOOP to be active simultaneously, during an LOS, without disrupting data in the framer
loopback path.
6
Table 8-27. Transmit Multiframe Yellow Alarm Options
Table 8-28. Transmit Upstream Alarm Indication Signal
GENERAL NOTE:
[TLB; addr: 077] to send all 1s in payload only.
AUTO_MYEL
5
INS_MYEL
US_TAIS
0
0
1
0
1
1
1
Mindspeed Technologies™
Systems that transmit framed all 1s can utilize the inband loopback code generator
—
Preliminary Information
4
TMYEL
X
0
0
1
US_AUTO_AIS
AUTO_US_AIS
X
0
1
3
AUTO_MYEL
X
X
0
1
TMYEL
Normal, no AIS
AIS during RLOS
Manual AIS
2
Inactive
Inactive
Follows SRED status
Active
Transmit Multiframe Yellow Alarm
Transmit Data
—
1
CX29503 Data Sheet
29503-DSH-002-B
US_TAIS
0