Stm-1/4 Dcc Operation Mode - Nortel Optical Multiservice Edge 6130 Planning Manual

10-8 Appendix A: Data communications planning
PPP, HDLC framing
High-Level Data Link Control (HDLC) is a data link layer 2 protocol used to
pass data between two systems on behalf of the network layer 3 protocol such
as TCP/IP Internet Protocol (IP).

STM-1/4 DCC operation mode

The DCC operation depends on the implemented protection scheme.
1+1 MSP system
The route diversity is provisionable and can either be Route-Diversity-Enabled
(ON) or Route-Diversity-Disabled (OFF) while configuring 1+1 MSP for the
STM-1/4 ports of the 2x622M aggregate circuit pack. The route diversity must
be set to Route-Diversity-Enabled (ON) while configuring 1+1 MSP for the
STM-1 ports of the 2x155M tributary circuit pack. On the OME6130 network
element, the route diversity is disabled by default.
In the Route-Diversity-Disabled option, the DCN operation bridges transmit
and select receiver based on the MSP state machine. The layer 2 and above are
presented with only one network interface:
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Optical Multiservice Edge 6130
Note 3: Operates in an un-numbered IP mode, using the Router ID (refer
to as circuitless IP for Nortel routers and loopback address for Cisco
routers).
Note 4: The DCN interface that is configured to operate on IP over
Standard PPP does not support configuration of the interface IP address
through IP Control Protocol (IP CP) negotiation. The OME6130 network
element while sending IPCP IP Address Configure-Ack packet (which is
sent in response to the IPCP IP Address Configure-Req packet) will send
the Router-ID as its IP address.
Note 1: The OME6130 uses the proprietary cHDLC encapsulation and
will not interwork with any Nortel equipment.
Note 2: Operates in an un-numbered IP mode, using the Router ID (refer
to as circuitless IP for Nortel routers and loopback address for Cisco
routers).
Note 3: Use for interworking with other cHDLC DCC network element.
Note 4: When iISIS is selected as the routing protocol, PPP with HDLC
framing cannot be selected as a Layer 2 Protocol.
In the receiver direction, only one of the two layer 1 interfaces (from
among the configured working and configured protected belonging to the
MSP pair) will be presented to the layer 2 termination protocol. The
presented interface shall follow the active path as defined by the MSP state
machine.
In the transmit direction, both layer 1 interfaces (configured working and
configured protected port of the MSP pair) transmit the same information
sent from the layer 2 protocol (bridge).
NT6Q92MA Rel 1.0 Iss 1 Standard September 2006