
Configuring WAN Line Services
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Select the line rate adaptation for this logical line.
Setting the Interframe Time Fill Pattern
The router transmits an interframe time fill (IFTF) pattern when there is no data
to transmit on a channel. You can select the IFTF pattern for transmission across
this logical line:
• Flags selects an 0x7E pattern (0 1 1 1 1 1 1 0).
• Idles selects an 0xFF pattern (1 1 1 1 1 1 1 1).
The router uses Flags by default.
Setting the CRC Size
By default, the routers uses the 16-bit CRC type. With 16-bit CRC, the router
appends a 16-bit CRC to the transmitted frames and performs a 16-bit CRC on
received frames. You can change to 32-bit CRC, where the router appends a 32-bit
CRC to transmitted frames and performs a 32-bit CRC on received frames.
You can set CRC size for the logical line.
Setting the MTU Size
The router uses the transmit/receive buffer size (MTU) to configure the largest
frame that the router can transmit or receive across this MCE1 port. The router
discards frames larger than this value. The MTU is 1600 bytes by default. You can
change it to any size from 3 to 4608 bytes for the logical line.
Site Manager: Rate Adaption parameter: page A-37
Site Manager: Interframe Time Fill Character parameter: page A-37
Site Manager: CRC Size parameter: page A-38
Site Manager: MTU Size (bytes) parameter: page A-38
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