
About Line Protocols
114078 Rev. A 2-15
Overview of WAN Protocols
There are several types of router circuits that support communication between two
points on a WAN. This section provides information on these WAN circuits:
• E1 Overview
• HSSI Overview
• ISDN Overview
•
Link Access Procedure Balanced (LAPB) Protocol Overview
• MCE1 and MCT1 Overview
• Synchronous Overview
•
T1 Overview
E1 Overview
E1 services use digital signals to allow two pairs of wires to carry 30 voice or data
transmissions.
Table 2-3 shows the specification for an E1 line.
E1 services (2.048 CEPT) are the European equivalent of T1 services, and operate
in a similar fashion. See “T1 Overview” for more information.
Note: For information on ATM ARE or FRE-2 circuits, see the Configuring
ATM Services guide. For information on ATM Data Exchange Interface (DXI),
see Configuring ATM DXI Services. ATM DXI operates over HSSI or
synchronous interfaces.
Table 2-2. Specification for E1 Line
Attribute Value
Framing rate 8000 frames/s
Channels per frame 32
Line speed 2.048 Mb/s
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