cx29503 Mindspeed Technologies, cx29503 Datasheet - Page 67

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

CX29503 Data Sheet
2.7
29503-DSH-002-B
DS3/E3 Framer Block
The DS3/E3 framing function operates in DS3-mapped STS-1, DS3/E3-mapped VC-
3, or external DS3/E3 access mode. In this operating mode, either the embedded DS1/
E1 can be derived from M13 block or the entire DS3/E3 payload data is terminated at
the TSB module. The DS3/E3 framing detection/insertion, performance monitoring,
alarm generation, overhead bit drop/insert function, and loopback capability are
supported within this block. Additionally, the embedded Terminal Data Link (TDL) is
also terminated at the embedded HDLC controller.
A framer core block diagram is shown in
The CX29503 has three DS3/E3 Framer Blocks, one per multiplexing /mapping
module. The DS3/E3 framers operate when the device is configured to one of the
following modes:
The DS3/E3 framing detection/insertion, performance monitoring, alarm generation,
overhead bit processing, and loopback capability are supported within this block. An
internal HDLC controller terminates the embedded TDL.
A DS3/E3 framer core is compatible with Mindspeed’s CX28342/3/4/6/8 DS3/E3
framer device, and software and functionality compatibility is maintained.
The following functions are provided within this block:
Access Control:
Dual Rail and NRZ Interface:
channelized DS3/E3 where the output is routed to the M13/E13 block
unchannelized DS3/E3
DS3/E3 mapped STS-1/VC-3
Selection of receiver data/clock path either from STS/SDH desynchronizer or
external I/O. STS/SDH desynchronizer data path is selected in the default mode.
Selection of transmit data path either from M13 or TSB Module. M13 data path is
selected in the default mode.
Dual-rail mode supports B3ZS, HDB3 and AMI line code.
In the NRZ mode, negative rail I/O can be used to carry the Line Code Violation
(LCV) information.
E3—G.751 framing is supported, G.832 framing is not.
The maximum frame-up time for DS3 is 1.5 ms.
The maximum frame-up time for E3 is 1.0 ms.
Supports Auto-reframe and Forced-reframe modes.
Supports the following in frame criteria:
DS3—Frame error-free for 3 consecutive frames
E3—Frame word error-free for 3 consecutive frames
Mindspeed Technologies™
Preliminary Information
Figure 2-9
Functional Description
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