Overhead Transparency; Stm-1/4 Dcc Implementation Rules - Nortel Optical Multiservice Edge 6130 Planning Manual

10-10 Appendix A: Data communications planning
•

Overhead transparency

OME6130 supports overhead bytes transparency via overhead tunnel
provisioning, by specifying the source and destination optical port, and
selecting the passthrough RS or MS overhead byte(s). This feature provides
the following capabilities:
•
•
•
•
The following are the overhead bytes which are allowed to pass transparently:
•
•

STM-1/4 DCC implementation rules

You must observe the following rules when you implement the DCC:
•
•
•
Optical Multiservice Edge 6130
STM port with LAPD/CLNP (OSI)
Designated byte(s) from the interworking or subtending networking
elements are passed transparently through the OME6130 network
elements.
Allows interoperability with other vendors' equipment that do not support
a standard-based OSI communication stack.
Using transparent DCC to forward OSI packets.
The same overhead bytes cannot be used for provisioning overhead
transparency and a DCC channel.
Regenerator Section overhead:
— E1: 64 kbps orderwire channels
— F1: 64 kbps user channel
— D1-D3: 192 kbps OA&M data
Multiplexer Section overhead
— E2: 64 kbps orderwire channels
— D4-D12: 576 kbps OA&M data
Only one regenerator section (RS) or multiplex section (MS) DCC can be
enabled per optical port.
Each DCC can support HDLC, PPP or LAPD. The default is PPP.
— When using DCC to connect to an OME6130 (or any network element
that supports IP based DCC datalink layer), select PPP as the protocol.
— When using DCC to connect to an OSI-based DCC datalink layer,
select LAPD as the protocol.
Set the LAPD IP MTU size to 446 when interworking with Optical Cross
Connect DX/ HDXc/ HDX, and Optical Multiservice Edge 6500. The user
has to manually configure the connected SDH interfaces to 512 bytes for
the LAPD MTU. The OME6130 LAPD MTU is set to 512 by default.
NT6Q92MA Rel 1.0 Iss 1 Standard September 2006