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CX28398

Quad/x16/Octal—T1/E1/J1 Framers

Conexant Systems 

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1.0 Product Description

1.1 Overview

The CX2839x devices each contain multiple T1/E1 framers which provide the

data access and framing portion of T1 and E1 physical layer interfaces:

Device

Number of Framers

CX28394

4

CX28398

8

CX28395

16

While the framers are identical, there are minor differences among the devices

due to the pins provided. These differences are summarized below.

1.1.1 External Datalink

The CX28394 and CX28398 devices include an External Datalink (DL3) which

provides signal access to any bit(s) in any time slot of all frames, odd frames, or

even frames, including T1 framing bits. Refer to Section 2.2.8, External Receive

Data Link (CX28394 and CX28398 Only), and 2.4.1, External Transmit Data

Link (CX28394 and CX28398 Only). The DL3 signals are not available on the

CX28395 device.

1.1.2 RINDO/TINDO

Receive and Transmit Time Slot Indicator signals are provided by each framer to

mark selected (programmable) receive and transmit system bus time slots. On the

CX28394 and CX28398 devices, these signals appear on different pins depending

on whether Multiplexed System Bus mode or Non-Multiplexed System Bus mode

is selected. On the CX28395, they are available only in Multiplexed Bus mode.

100054E

Conexant

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