Alcatel-Lucent 7705 - United States Regulations; Federal Communications Commission

7705 SAR Interfaces
7705 SAR OS Interface Configuration Guide Page 33
MP introduces a new protocol type with a protocol ID (PID) of 0x003d. Figure 1 and
Figure 2 show the MLPPP fragment frame structure. Framing to indicate the beginning and
end of the encapsulation is the same as that used by PPP and described in RFC 1662, PPP in
HDLC-like framing.
MP frames use the same HDLC address and control pair value as PPP: Address – 0xFF and
Control – 0x03. The 2-octet protocol field is also structured the same way as in PPP
encapsulation.
The required and default format for MP is the 24-bit format. During the LCP state, the 12-bit
format can be negotiated. The 7705 SAR is capable of supporting and negotiating the
alternate 12-bit frame format.
The maximum differential delay supported for MLPPP is 25 ms.
Figure 1: MLPPP 24-bit Fragment Format
Figure 2: MLPPP 12-bit Fragment Format
01234567890123456789012345678901
1111111111222222222233
Address 0xff
BE
Control 0x03 PID 0x003d
Sequence
Fragment Data...
Fragment Data... FCS
19487
01234567890123456789012345678901
1111111111222222222233
Address 0xff
BE
Control 0x03 PID 0x003d
Sequence Fragment Data
Fragment Data...
Fragment Data... FCS
19488