Pcm Interface Description; Pcm Signal Description - Fibocom NL668-LA Series Hardware Manual

5.7.3 PCM Interface Description

Table 5-15 PCM interface description
Pin Name Frequency
PCM_CLK 2.048MHz
PCM_OUT -
PCM_IN -
PCM_SYNC 8KHz
NL668-LA series module adopts the above configuration by default, any adjustment please contact
Fibocom Wireless technical support.

5.7.4 PCM Signal Description

The PCM signal of NL668-LA series module adopts domestic mainstream Europe E1 standard.
PCM_CLK frequency is 2.048MHz clock in 16bit linear format encoding. PCM_SYNC is an 8kHz burst
(488nS).
Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FIBOCOM NL668-LA Series Hardware Guide
Coded
Duty Cycle
Format
50%
-
-
16bit
mono
Short pulse
Figure 5-14 PCM_SYNC timing
Figure 5-15 PCM_CODEC to NL668-LA timing
Operating Mode
Liner
Module serves
as master
Description
PCM CLK
PCM Output
PCM Input
PCM Synchronous
Signal (Falling
edge sampling)
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