Can E1 transfer cables on one U1900 model apply to other U1900 models?

On U1900 devices, not all E1 interfaces support the same E1 transfer cables. The differences are as follows:
1. The digital trunk interfaces of the U1910 and U1930 are integrated into the CVP board and support the DB26 connector. The U1910 provides one E1/T1 interface and the U1930 provides two E1/T1 interfaces.
2. The media resource boards of the U1911, U1960, and U1981 are all MTU boards whose interfaces support the DB9 connector. One MTU board provides two E1/T1 interfaces and each interface supports two trunks.
Note: On the old MTU board (there are only two LOS indicators and two RFA indicators on the panel), the trunk port numbers provided by the E1/T1-0 interface are 0 and 2, and the trunk port numbers provided by the E1/T1-1 interface are 1 and 3.
3. The U1980 has two types of digital trunk interface boards, DTU-4 and DTU-8. On the DTU-4 board, the interface supports the DB50 connector and 4 E1/T1 interfaces are provided. On the DTU-8 board, the interface supports the DB50 connector and 8 E1 interfaces are provided.

In conclusion, the E1 lines of one device can apply to other devices only when all corresponding interfaces support the same connector.