Release 1.0
Digium, Inc.
Page 35
Chapter 3: Configuration
Timing:
Determines whether the card provides timing (0), takes timing (1),
takes backup span timing (2), provides backup span timing (3), and so
on. Only one span can be defined to take timing and it defines timing
for the rest of the card spans.
Line Build Out
For most setups the line build out is 0.
0: 0 db (CSU) / 0-133 feet (DSX-1)
1: 133-266 feet (DSX-1)
2: 266-399 feet (DSX-1)
3: 399-533 feet (DSX-1)
4: 533-655 feet (DSX-1)
5: -7.5db (CSU)
6: -15db (CSU)
7: -22.5db (CSU)
Framing
T1 utilizes framing set for D4 (SF) or ESF. E1 utilizes CAS or CCS.
Coding
T1 coding can be AMI or B8ZS. E1 coding can be AMI or HDB3. E1
can also have the extra flag CRC4 at the end for CRC4 checking.
Yellow flag can also be added at the end for transmitting a yellow
alarm when all channels are in use.
