4a Sonet Reach Specifiers, Encoding | Finisar AN-2030 specs

Table 3.5: Encoding codes

AN-2030: Digital Diagnostic Monitoring Interface for Optical Transceivers

F i n i s a r

1The SONET compliance code bits allow the host to determine with which specifications

2a SONET transceiver complies. For each bit rate defined in Table 3.5 (OC-3, OC-12,

3OC-48), SONET specifies short reach (SR), intermediate reach (IR), and long reach

4 (LR) requirements. For each of the three bit rates, a single short reach (SR)

5specification is defined. Two variations of intermediate reach (IR-1, IR-2) and three

6variations of long reach (LR-1, LR-2, and LR-3) are also defined for each bit rate. Byte

74, bits 0-2, and byte 5, bits 0-7 allow the user to determine which of the three reaches

8has been implemented – short, intermediate, or long. Two additional bits (byte 4, bits 3-

94) are necessary to discriminate between different intermediate or long reach variations.

10These codes are defined in Table 3.4a.

11		Table 3.4a: SONET Reach Specifiers

	Speed	Reach	Specifier bit 1	Specifier bit 2	Description

	OC-3/OC-12/OC-48	Short	0	0	SONET SR compliant

	OC-3/OC-12/OC-48	Intermediate	1	0	SONET IR-1 compliant

	OC-3/OC-12/OC-48	Intermediate	0	1	SONET IR-2 compliant

	OC-3/OC-12/OC-48	Long	1	0	SONET LR-1 compliant

	OC-3/OC-12/OC-48	Long	0	1	SONET LR-2 compliant

	OC-3/OC-12/OC-48	Long	1	1	SONET LR-3 compliant
12
12

13Encoding

14The encoding value indicates the serial encoding mechanism that is the nominal design

15target of the particular SFP. The value shall be contained in the serial data. The defined

16 encoding values are shown in table 3.5. Finisar Gigabit Ethernet/Fibre Channel

17transceivers have this byte set to 01h (8B/10B encoding), and SONET transceivers

18(including all SONET multi-rate transceivers) are set to 05h (SONET Scrambled).

Code	Description of encoding mechanism

00h	Unspecified
01h	8B10B
02h	4B5B
03h	NRZ
04h	Manchester
05h	SONET Scrambled
06h -FFh	Reserved

9/26/02 Revision D

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