DLL card

Major features

There are 8/4/2 channel E1 interfaces and 4/2/1 digital loops on every digital loop line card
E1 cables support direct connection when power is down (1 directly connects to 2, 3 to 4, 5 to 6, and 7 to 8)
Provides 256/128/64 party conference, 64 parties for each loop
Clock extraction
Supports main/ standby roles
Supports online update of softwares
An 8-bit address dip switch is provided for each digital loop in the card. Look at the circuit card, there are 5 red dip switch sets, among which the set at the beginning of the right side is reserved for special use, and the rest four, from left to right, respectively represents the address of Loop1, Loop 2, Loop 3 and Loop 4 on this circuit card, and 0 stands for ‘up’, 1 stands for ‘down’; the left is at low position, and the right is higher.