Connecting an E1 interface cable
The E1 interface cables for the MSR20-12 are E1 G.703-compliant 75-ohm unbalanced coaxial cables.
A 75-ohm unbalanced coaxial cable connects MSR20-12 with the DB-15 connector and the network end
with the BNC connector.
To connect an E1 interface cable:
1.
Connect the DB-15 connector of the E1 cable to the E1 port on the router.
2.
Connect the other end of the E1 cable to the corresponding network device:
{
Directly connect the BNC connectors of the cable to the remote equipment if there is no need for
extension.
{
Connect the BNC connectors of the cable to coaxial connectors and the other end of the
coaxial connectors to the remote network equipment through 75-ohm E1 trunk cables, if cable
extension is needed.
CAUTION:
Connect the wire marked TX in the E1 cable to the peer wire marked RX and the wire marked RX to the
peer wire marked TX.
Figure 35
Connect an E1 interface cable
Figure 36
Extending an E1 75-ohm unbalanced coaxial cable
Router
Network
devices
such as DDN
DB-15
Coaxial connector
BNC
BNC
75-ohm non-balanced coaxial cable
75-ohm E1 trunk cable
Connecting a T1 interface cable
An MSR20-12 T1 interface cable is a 100-ohm standard shielded Ethernet cable that has RJ-45
connectors at both ends.
To connect a T1 interface cable:
1.
Connect one end of the T1 cable to the RJ-45 connector on the T1 port of the router.
2.
Connect the other end of the T1 cable to the corresponding device.
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