ZL50015GAC ZARLINK [Zarlink Semiconductor Inc], ZL50015GAC Datasheet - Page 48

• Manufacturer Part Number: ZL50015GAC
• Description: Enhanced 1 K Digital Switch with Stratum 4E DPLL
• Manufacturer: ZARLINK [Zarlink Semiconductor Inc]

19.0
The ZL50015 provides per-channel code translation to be used to adapt pulse code modulation (PCM) voice or
data traffic between networks which use different encoding laws. Code translation is valid in both Connection Mode
and Message Mode.
In order to use this feature the Connection Memory High (CM_H) entry for the output channel must be
programmed. V/D (bit 4) defines if the traffic in the channel is voice or data. Setting ICL1 - 0 (bits 3 - 2) programs the
input coding law and OCL1 - 0 (bits 1- 0) programs the output coding law as shown in Table 13.
The different code options are:
For voice coding options, the ITU-T G.711 A-law and ITU-T G.711 µ-law are the standard rules for encoding. A-law
without Alternate Bit Inversion (ABI) is an alternative code that does not invert the even bits (6, 4, 2, 0). µ-law
without Magnitude Inversion (MI) is an alternative code that does not perform inversion of magnitude bits (6, 5, 4, 3,
2, 1, 0).
When transferring data code, the option “no code” does not invert the bits. The Alternate Bit Inversion (ABI) option
inverts the even bits (6, 4, 2, 0) while the Inverted Alternate Bit Inversion (ABI) inverts the odd bits (7, 5, 3, 1). When
the “All bits inverted” option is selected, all of the bits (7, 6, 5, 4, 3, 2, 1, 0) are inverted.
The input channel and output channel encoding law are configured independently. If the output channel coding is
set to be different from the input channel, the ZL50015 performs translation between the two standards. If the input
and output encoding laws are set to the same standard, no translation occurs. As the V/D (bit 4) of the Connection
Memory High (CM_H) must be set on a per-channel basis, it is not possible to translate between voice and data
encoding laws.
Input Coding
(ICL1- 0)
PCM A-law/
00
01
10
11
µ
-law Translation
Table 13 - Input and Output Voice and Data Coding
Output Coding
(OCL1 - 0)
00
01
10
11
Zarlink Semiconductor Inc.
ZL50015
ITU-T G.711 A-law
ITU-T G.711 µ-law
A-law without Alternate Bit
Inversion (ABI)
µ-law without Magnitude
Inversion (MI)
48
Voice Coding
(V/D bit = 0)
No code
Alternate Bit Inversion (ABI)
Inverted Alternate Bit
Inversion (ABI)
All bits inverted
Data Coding
(V/D bit = 1)
Data Sheet