Motorola T1/E1 ユーザーズマニュアル

Canopy  T1/E1 Multiplexer 

 

 

 

 

 

 

September 2004 

 

 

 

 

 

 

     

      T1/E1 Multiplexer FPGA Version 3.4 

 
 

 

Page 24 of 73 

 

 

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 

 

 

 

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