Stm-1/4 Data Communication Channel; Data Link Layer Protocols - Nortel Optical Multiservice Edge 6130 Planning Manual

STM-1/4 Data Communication Channel

Each line optical port can support communications on the selected regenerator
section (RS) or the multiplexer section (MS) overhead byte(s).
Each DCC interface supports High-Level Data Link Control (HDLC),
Point-to-Point Protocol (PPP), or Link Access Procedure D-Channel (LAPD).
HDLC and PPP are IP-based datalink layer and LAPD is an OSI-based
datalink layer. PPP is the default datalink layer.
The OME6130 uses an IP-based data communications infrastructure for
network element management and interworking with IP-managed network
elements. OME6130 also supports Open Systems Interconnection (OSI) based
infrastructures for interoperability with OSI-managed network elements.

Data link layer protocols

The following are the supported data link layer 2 protocols used with
OME6130 network element through the DCC channels:
LAPD
Link Access Procedure D-Channel (LAPD) is a data link layer 2 protocol used
by OME6130 for interworking with OSI networks over DCC.
The OME6130 network element supports LAPD layer 2 protocol on all
STM-n/OC-n ports terminating the layer 1 channel using the over-head bytes.
The OME6130 network supports at least as many LAPD instances as the
number of STM-n ports in the OME6130 network element.
LAPD detects and reports to higher layers the up or down status of the physical
interface. An alarm to indicate link failure shall be supported.
Standard PPP, RFC1661
Point-to-point protocol (PPP) 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). OME6130 uses the standard PPP as per RFC1661.
Note 1: The OME6130 network element can support presentation of either
LAPD or PPP to the layer 1 interface. Each layer 1 interface can only
terminate either LAPD or PPP protocol, but not both simultaneously.
Note 2: It is possible to configure layer 2 protocol for each layer 1
interface independently, on a per layer 1 interface basis.
Note 1: PPP uses IP Control Protocol (IPCP) over OSI Network Layer
Control Protocol (OSINLCP) to pass data between layer 2 and layer 3
protocols. Recommended for standard implementation.
Note 2: Use this option for interworking with any Nortel equipment which
supports IP/PPP over DCC channel.
Planning Guide NT6Q92MA Rel 1.0 Iss 1 Standard September 2006
Appendix A: Data communications planning 10-7