ISDN is a synchronous network, meaning that all endpoints on the network need to synchronize on
the same clock signal. Typically, one endpoint acts as the clock MASTER, generating the clock
signal, and the other endpoints act as clock SLAVE, synchronizing on the clock signal received
from the MASTER.
By default, a NT type endpoint acts as clock MASTER, and a TE type endpoint acts as clock
SLAVE. This default behaviour can be changed by using the web interface of the Mediatrix units.
The clock mode of the ISDN endpoints can be set to either clock MASTER or clock SLAVE.
The following is a description of the endpoints behaviour with regards to clock signal
- In transmission, all endpoints, regardless of their type, send a clock signal along with the
data they send.
- In reception, all endpoints, regardless of endpoint type, use the clock they receive from
the other end to synchronize the received data.
- In transmission, a clock SLAVE adjusts the clock it sends, based on the clock received from
the other end in reception.
- In transmission, a clock MASTER sends an absolute clock signal that does not depend on the
clock received from the other end.