3Com 3C13751 Getting Started Manual page 40

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:
Table 17 E1 interface attributes
Attribute
Connector type
Interface standard
Maximum baud rate
Matching cable
Operating mode
Function
E1 interface cable E1 interface cable, which is G.703-compatible, may
be 75Ω unbalanced coax cable or 120Ω balanced twisted pair cable.
unbalanced coax cable
75Ω
■
Figure 27 E1 75Ω unbalanced coax cable
You can also choose to attach both ends with BNC connectors, for
Ω
extending two 75 unbalanced coax cables.
120Ω balanced twisted pair cable
■
Description
DB15
G.703, G.704
2.048Mbps
E1 75Ω unbalanced coax cable
E1 120Ω balanced coax cable
Coax connector, network interface connector,
75Ω−120Ω converter (with BNC connector)
E1, CE1, ISDN PRI
Backup
Terminal access
ISDN PRI