Engineering Guidelines - Nortel Optical Multiservice Edge 6130 Planning Manual

Engineering guidelines

The following are DCN engineering guidelines:
For configurations that exceed the following guidelines, contact Nortel for
assistance.
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STM-1/4 DCC
— Maximum of 10 DCCs per network element
— Maximum of 1 Regenerator section (RS) or Multiplex section (MS)
DCC per optical interface
— Regenerator section (RS) DCC using D1-D3 bytes at 192 kbps
— Multiplex section (MS) DCC using D4-D12 bytes at 576 kbps
LAPD
— MTU frame size of 240 to 512 bytes (default is 512)
— Metric: The DCC default metric is set to 4. When interworking with
legacy network elements, use the following DCC metrics:
– MS DCC: 5
– RS DCC: 6
— CLNP supported over LAPD (Default MTU frame size of 512 bytes
when presented to CLNP. The MTU size is user configurable and
should be in the range [240-512] bytes).
PPP
— MTU frame size of 1518 bytes
— Non-configurable default parameters:
– Maximum receive unit: no limitation
Note: Does not perform negotiation for MRU and accepts packets of any
size
– Authentication protocol: disabled
– Quality protocol: None
– Protocol field compressed: Disabled
– Address and control field compressed: Disabled
– FCS alternatives: 16 bit FCS
— Configurable default parameter:
– Magic number: <Disable>
Planning Guide NT6Q92MA Rel 1.0 Iss 1 Standard September 2006
Appendix A: Data communications planning 10-23
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