cx29503 Mindspeed Technologies, cx29503 Datasheet - Page 87

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

CX29503 Data Sheet
29503-DSH-002-B
Unframed DS1/E1 Mode
In unframed DS1/E1 mode, the DS1/E1 framer is configured to operate in
'transparent' mode. The frame sync signal and overhead data link clocks from the
framer are disabled.
For unframed DS1/E1 link mode in the Rx direction, TSB receives DS1/E1 clocks and
unframed DS1/E1 data streams from the DS1/E1 framer. Any DS1/E1 Frame Sync
signals received from the DS1/E1 framer are ignored by TSB. An unframed DS1/E1
data stream contains only payload data. TSB does not pass any overhead data, so
overhead TSBUS timeslots corresponding to Unframed DS1/E1 links are filled with
the value 0xFF.
For unframed DS1/E1 link mode in the Tx direction, TSB receives DS1/E1 clocks and
transmits unframed DS1/E1 data streams to the DS1/E1 framer. The data link clocks
from the DS1/E1 framer are disabled. When a link is configured for unframed DS1/
E1, TSB does not transmit a frame sync pulse to the DS1/E1 framer, nor receives a
DS1/E1 frame sync from a system side device.
Unframed DS1/E1 Mode is selected by setting bits at the Unframed Link Control
Registers 1-4, at addresses 0x1ED-0x1F0.
Mapping of Unchannelized STS-1 Signals
Table 2-9
unchannelized STS-1 is a single data path. All of the unchannelized STS-1 bytes (756
bytes) are mapped into VSP 1, which is comprised of 84 concatenated TSB time slots.
For a given data path, the transmit direction and the receive direction use all 84 time
slots and VSP 1. The host software selects the unchannelized STS-1 operation by
setting the CLEAR_STS-1 bit in the TSB Module Operation register [TSB block,
addr: 0xFC].
Table 2-9. Mapping of Unchannelized STS-1 To and From TSB Time Slots
Mapping of Unchannelized DS3 Signals
Table 2-10
interface on the CX29503 is configured as a DS3 serial channel. The unchannelized
DS3 is a single data path. All of the unchannelized DS3 payload data is mapped
sequentially into VSP 1, which is comprised of 84 concatenated TSB time slots. For a
given data path, the transmit receive directions use all 84 time slots and VSP 1.
Table 2-10. Mapping of Unchannelized DS3 To and From TSB Time Slots in SI-Bus Mode
Synchronous Payload Envelope (SPE)
Unchannelized DS3 Data Rate
defines the mapping of the unchannelized STS-1 data path. The
defines the mapping of the unchannelized DS3 data path when the line
Mindspeed Technologies™
(Approximate)
Byte Numbers
44.210 Mbps
1–756
Preliminary Information
Time Slot Numbers
Time Slot Nos.
Concatenated
Concatenated
1–84
1–84
Functional Description
VSP No.
VSP No.
1
1
2
-
39