Canopy T1/E1 Multiplexer | September 2004 |
| T1/E1 Multiplexer FPGA Version 3.4 |
Figure 9: Slave timing set to Recovered mode
Network Timing Scenarios
Typically, when connecting two T1 devices, one end is set as the master clock source and the other end is set as the slave clock source. The slave device takes the timing information from the master clock source. The slave device then synchronizes its clocks with the master. This is shown in Figure 10.
Figure 10: Network timing scenarios
When a Canopy T1/E1 Multiplexer is inserted between two T1 devices, the clocking should be configured in the same manner as it would be without the Canopy T1/E1 Multiplexer. For example, when the Canopy T1/E1 Multiplexer is inserted between the two PBXs, the one PBX will remain as the master clock source and the other PBX will remain as the slave clock source. The Canopy T1/E1 Multiplexer should be configured in the following manner:
◦The Canopy T1/E1 Multiplexer connected to the master clock source should be configured in Loopback Timing Mode. The unit will take the clock signal from the PBX master clock source on the PBX transmit side, derive the clock and then send it back to the PBX on the receive side.
◦The Canopy T1/E1 Multiplexer connected to the slave clock source should be configured in Recovery Timing Mode. It will derive a clock signal from the incoming bit stream from the WAN side and pass it on to the slave PBX.
Issue 3 | Page 24 of 73 |