linecode/framing in E1

[spremkumar]

hi

whts the diff between linecode :

ami AMI encoding

hdb3 HDB3 encoding

whts the purpose of mentioing the same ?

framing Selects the frame type for the T1 or E1 data line.but in the framing option ther r only 2 options like crc4/no crc4 .how we can define the frame type for T1 and E1 ??

thx

prem

[bbranch]

For T1 you have two options for framing - Super Frame (SF) or Extended Frame (ESF). For E1 you have three options for framing - CRC4, No-CRC4 or Autralia:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/finter_r/irfdelay.htm#1028980

[Dargraham]

AMI is Alternate Mark Inversion which means that each pulse has to be different from the last, -3v or +3v. The HDB3 is a means to keep excessive zeros from crossing the E1, similar to B8ZS if you know what that does HDB3 has the same affect only different.