HP ProCurve Secure 7000dl Series Basic Management And Configuration Manual page 193

Router (DTE)
LAN
Figure 4-3. Router Connects Directly to an External CSU/DSU.
If your public carrier does not provide the DSU, the router must include a built-
in DSU. You will then use UTP cable with RJ-48C connectors to connect the
router to the external CSU. (See Figure 4-4.)
UTP cable with
RJ-48C connectors
Router w/
internal DSU
LAN
Figure 4-4. Router with a Built-in DSU Connects Directly to the External CSU.
If your public carrier does not provide the CSU/DSU, the router must include
a built-in CSU/DSU. In this case, the public carrier provides a wall jack on your
premises to connect your router to the local loop, and you use UTP cable with
RJ-48C connectors to connect the router to the wall jack. (See Figure 4-5.)
Configuring E1 and T1 Interfaces
Overview of E1 and T1 WAN Connections
Network
CSU/
Interface Unit
DSU
(Smart Jack)
Demarc
Network
Interface Unit
CSU
(Smart Jack)
Demarc
Wire span
Repeater
OCU
Public
Carrier's CO
Office Channel Unit
(public carrier's CSU)
Wire span
Repeater
OCU
Public
Carrier's CO
Office Channel Unit
(Public carrier's CSU)
4-7