Foundry Networks Switch and Router Installation And Configuration Manual page 187

Table 6.3: CLI Display of POS Interface Information (Continued)
This Field...
Frame
Scram
CRC
c2
j0
h1
To display detailed information for a POS port, enter a command such as the following at any level of the CLI:
December 2000
Displays...
The frame type used on the interface. The frame type can be one of
the following:
• sdh – Synchronous Digital Hierarchy.
• sonet – Synchronous Optical Network. This is the default.
To change this parameter, see "Changing the Frame Type" on page 6-
9.
The state of the ATM scramble mode, which can be one of the
following:
• no – Scrambling is disabled. This is the default.
• yes – Scrambling is enabled.
To change this parameter, see "Enabling or Disabling ATM
Scrambling" on page 6-9.
The length of the CRC field in packets transmitted on the interface.
The length can be one of the following:
• 16 – The field is 16 bits long.
• 32 – The field is 8 bits long. This is the default.
To change this parameter, see "Changing the CRC Length" on
page 6-7.
The value of the c2 flag in the SONET headers of packets transmitted
by the interface. The c2 flag identifies the payload type of the packets
transmitted on this interface. The c2 flag is set to 0xcf by default.
This value indicates that the payload is SONET or SDH.
To change this parameter, see "Changing the POS Flags" on page 6-
8.
The value of the j0 flag in the SONET headers of packets transmitted
by the interface. This flag sets the trace byte, which is used to trace
the origin of an STS-1 frame on a SONET network. This flag is set to
0xcc by default.
To change this parameter, see "Changing the POS Flags" on page 6-
8.
The value of the h1 flag in the SONET headers of packets transmitted
by the interface. This flag sets the H1 pointer, which is used to
indicate where the SPE (Synchronous Payload Envelope) starts
within the packet. The SPE contains the packet's payload.
This flag can have one of the following values:
• 0x00 – The pointer for SONET frames. This is the default.
• 0x02 – The pointer for SDH frames.
To change this parameter, see "Changing the POS Flags" on page 6-
8.
Using Packet Over SONET (POS) Modules
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