Cisco Systems OL-7396-01 Configuring the Channelized E1 Frame Relay Port Adapter

20-7
ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter20 Configuring Frame Relay to ATM Interworking Port Adapter Interfaces
Configuring the Channelized E1 Frame Relay Port Adapter
Configuring the Channelized E1 Frame Relay Port Adapter
The channelized E1 (CE1) Frame Relay port adapter provides four physical ports. Each port supports up
to 31 E1 serial interfaces, also referred to as channel groups, totalling 124 serial interfaces per port
adapter. The E1 line operates at 2.048 Mbps, which is equivalent to 31 time slots (DS0 channels). The
E1 time slot provides usable bandwidth of n x 64 kbps, where n is the time slot from 1 to 31.
Figure 20-2 illustrates how an E1 trunk (with four ports) provides single or multiple time slots mapped
across the ATM network. Each time slot represents a single n x 64 circuit that transmits data at a rate of
64 kbps. Multiple n x 64 circuits can be connected to a single p ort, using separate time slots.
Figure 20-2 E1 Time Slot Mapping
Default CE1 Frame Relay Port Adapter Interface Configuration
The following defaults are assigned to all CE1 Frame Relay port adapter interfaces:
•Framing—crc4
•Clock source—loop-timed
•Line coding—HDB3
E1 4 ports
E1 4 ports
E1 4 ports E1 4 ports
E1 4 ports E1 4 ports
(TS 9 x 64)
(TS 12 x 64)
(TS 5 x 64)
(TS 9 x 64) (TS 1 x 64)
(
TS 12 x 64) (TS 4 x 64)
(TS 1 x 64) (TS 4 x 64) (TS 5 x 64) (TS 8 x 64)
(TS 8 x 64)
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