Number of ADPCM channels in E1 ??

Started by August 25, 2005
Hi fellow
Im new comer . could anyone please help me out .

1 . how many channels are transmitted if we have compressed the voice channels in E1 with ADPCM with 40kbps, 32kbps, 24kbps, 16kbps bitrate.

2. Is their any specific frame structure like that for Pcm channels transmitted in E1 .

3. If possible please refer me some site or document.

With Regards