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40 Chapter 2: Installation
E1 interface to DSU/CSU
Introduction to the E1 interface E1 interface, which stands for
channelized CE1/PRI interface, is responsible for forwarding and
processing E1 data flow, delivering CE1 access and implementing ISDN
PRI function. Its attributes are listed in the following table:
E1 interface cable E1 interface cable, which is G.703-compatible, may
be 75Ω unbalanced coax cable or 120Ω balanced twisted pair cable.
■ 75Ω unbalanced coax cable
Figure 27 E1 75Ω unbalanced coax cable
You can also choose to attach both ends with BNC connectors, for
extending two 75
Ω unbalanced coax cables.
■ 120Ω balanced twisted pair cable
Table 17 E1 interface attributes
Attribute Description
Connector type DB15
Interface standard G.703, G.704
Maximum baud rate 2.048Mbps
Matching cable E1 75Ω unbalanced coax cable
E1 120Ω balanced coax cable
Coax connector, network interface connector,
75Ω−120Ω converter (with BNC connector)
Operating mode E1, CE1, ISDN PRI
Function Backup
Terminal access
ISDN PRI