cx28224 Mindspeed Technologies, cx28224 Datasheet - Page 90

• Manufacturer Part Number: cx28224
• Description: Cx28224/5/9 Inverse Multiplexing For The Atm Ima Family
• Manufacturer: Mindspeed Technologies

Transmission Convergence Block
5.2.5
5.2.5.1
5-8
Framing Modes (UTOPIA-to-Serial Configuration)
The CX2822x’s eight serial ports can be individually configured for the major
framing modes to a maximum of 10 Mbps: T1/E1 and DSL. A general purpose
framing mode provides an interface to customized framers at a maximum of 10 Mbps.
Each of the eight ports can be configured for a different mode.
T1/E1 Interface
This describes the timing requirements of the CX28229 when operating in T1 or E1
mode. Connection to a CN8370 T1/E1 framer is used as an example, as illustrated in
Figure
ignores the T1/E1 overhead, extracts the ATM cells, and passes the ATM cells to the
ATM layer device. In the transmit direction, the CX28229 inserts 0’s in the overhead
bit locations and fills the rest of the frame with ATM cells from the UTOPIA bus.
For the E1 mode, the ATM cells are mapped into time slots 1–15 and 17–31 as
described in Recommendation G.804. For the T1 mode, the ATM cells are mapped
into time slots 1–24.
5-4. The CX28229 receives a T1/E1 data stream from the external framer,
Mindspeed Technologies
™
CX28224/5/9 Data Sheet
28229-DSH-001-D