class modem card A Law question??? - PBX Info :: Your Free PBX, PABX and Telephone Information Resource

justzikle · 08-29-2006, 06:13 AM

Hi all system is 61c RLS 4.5. I have programmed system configuration with MU Law(PCML=MU), No i also got XCMC (CLI card). I am wondering about A Law mentioned on card face plate.XCMC NT5D81BA A Law, Shud it work with 61c RLS4.5 configured with MU law???? or do i have to change something while programming this class modem card???
regards

XCMC NT5D81BA A Law

shankar · 08-29-2006, 11:52 AM

does this companding law has got something to do with the class card?

justzikle · 08-29-2006, 12:25 PM

thats wat i m fearing off.

justzikle · 08-31-2006, 09:17 AM

Any more help????? How does Asia Pacific PBX are programmed, i mean A-LAW or MU LAW???

anil · 09-02-2006, 03:31 PM

Pulse Code Modulation
PCM is a Time-Domain Waveform coding method and is defined within CCITT G.711, and AT&T 43801. Basically, an analog signal is sampled at a rate of 8000 times per second. In each sample, the amplitude of the signal is assigned (quantized) a digital value.

For a true linear system, the value of each "step" is uniform, requiring anywhere from 11 to 14 bits to transmit. However, PCM, as defined and standardized, utilizes a logarithmic scale in the weighting of each step.

There are two PCM algorithms defined within CCITT G.711, called "A-Law" and "Mu-Law". Mu-Law PCM is used in North America and Japan, and A-Law used in most other countries. In both A-Law and Mu-Law PCM, the values used to represent the amplitude is a number between 0 and +/- 127; therefore, 8 bits are required to represent each sample (2 to the eigth power = 256).

It can be seen then that PCM operates at a rate of: 8 bits/sample * 8000 samples/sec = 64000 (64K) Bits Per Second

More Details
http://telecom.tbi.net/pcm1.html

sengong · 09-05-2006, 09:40 PM

The system has to program as A law and the analog card must be flexible analog cards. I have tested many XCMC A-law cards with NT5K02KB FALC and it works.

justzikle · 09-09-2006, 12:54 AM

What type of LAW u guys recommend for ASIA PACIFIC??? i mean A-Law or MU Law, what shud i put in LD 97, INTN=?? for asia pacific

anil · 09-09-2006, 07:13 AM

use alaw
intn yes
code 2
also you have to change
xctp
dtmf value

value of dial tone will be change

dial tone 129

justzikle · 09-10-2006, 01:39 PM

Anil, where do i have to change xctp dtmf value?? i mean how??

value of dial tone will be change

where do i put dial tone 129?
Regards

anil · 09-10-2006, 01:47 PM

Ld 97
prt
xctp
Dtmf I dont Know the real Value

Ld 56
Tone and cadence

Dial tone value you can Change here

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Companion Controller Card Question	morpheus	Meridian Systems	1	06-09-2006 03:45 PM
CallPilot SMDI Modem Replacement	gei_spot	Meridian Systems	1	01-30-2004 07:32 PM
Replace analog line card	thephoneguy	Meridian Systems	2	08-04-2003 11:42 AM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)