Hello dear Asim.
The MD1 is a packet board it changes 32E1 into packet and then to the crossconnect that forward it to the line board which is a packet NNI port.
The MD1 uses CES (circuit emulation ) to transmit TDM over packet .
So it is a packet board .
Also when you make configuration for an E1 on the MD1 you create a PW Eline not juat as TDM-E1 that needs VC12 when configuring .
Thanks