Cisco 2600 Series Operation Manual page 49

Figure 5-12
FE-PR I
1FE- 1CE1 -B/U
CE1/PRI-U Port
Use the appropriate cable to connect a CE1/PRI-U (75-ohm) port to an E1 CSU.
Figure 5-13 shows a CSU with BNC connectors.
Connecting Fast Ethernet Channelized E1 Modules to the Network
Connecting a CE1/PRI-B Port to an E1 CSU (DB-15-to-RJ-45
Connectors)
CTRLR 0
CE1/PRI port (DB-15)
E1 cable for 120-ohm
balanced connections
with an RJ-45 connector
at the network end
Connecting Fast Ethernet PRI Network Modules to a Network 5-11
10/100B aseT
EN
RJ-45 jack