cx29503 Mindspeed Technologies, cx29503 Datasheet - Page 119

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

5.1
Figure 5-1. DS3/E3 Loopback Definitions
29503-DSH-002-B
Rx
Type 6
Type 5
B3ZS/
HDB3
DS3/E3 Framer and M13 MUX Loopbacks
5.0 Loopbacks
The CX29503 supports a full set of line and system side loopbacks.
The loopbacks available in the DS3/DS2/DS1 block are shown in
loopbacks operate on a per tributary basis. All line loopback features defined for DS3/
DS2/DS1 will also apply for E3/E2/E1 signals.
Type 8
Type 1 Loopback (DS3 Payload Loopback)—Supports the DS3 FEAC-based DS3
loopback. FEAC patterns are reported in status registers. The software is capable
of activating/deactivating the DS3 loopback based on this status bit and optionally
inserting Alarm Indication Signals (AIS) to downstream components. The
software is capable of inserting this code into transmitted DS3 overhead bits.
Type 2 Loopback (DS3-Activated DS2 Line Loopback)—DS3-C bit stream is
examined for a DS2 loopback sequence. The software is capable of enabling/
disabling this feature and optionally inserting AISs to downstream components. If
this feature is enabled by the software, the hardware shall autonomously enable
loopback when a loopback command is received.
If the software has requested AIS insertion, the hardware inserts the AIS to the
downstream components for the duration of the loopback. The hardware will
indicate via a status bit that a loopback is in process. The hardware will
autonomously terminate the loopback after receiving the appropriate command in
the C-bit stream and update the status register. The software is capable of inserting
this DS2 loopback code into transmitted DS3 overhead bits.
This loopback requires M13 multiplexing and, therefore, is not applicable in C-bit
parity mode.
DS3/E3
Framer
Mindspeed Technologies™
Type 1
Preliminary Information
M23/E23
MUX
Type 2
DS2/E2
Framer
M12/E12
MUX
Table
Type 4
5-1. All
Tx
100702_037
5
-
1