CN1219261C

CN1219261C - Method and apparatus for plugging optical transcreceiving module internal E2 PROM for read broadband network device

Info

Publication number: CN1219261C
Application number: CNB031480837A
Authority: CN
Inventors: 宋禹
Original assignee: Harbour Networks Holdings Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2003-06-30
Filing date: 2003-06-30
Publication date: 2005-09-14
Anticipated expiration: 2023-06-30
Also published as: CN1471245A

Abstract

The present invention provides an E2PROM reading method in inserting and pulling optical receiving and transmitting modules of a broadband network device and a device thereof, and belongs to the field of computer network communication. The method comprises: clock signals of an I2C controller is connected with I2C interfaces of the inserting and pulling optical receiving and transmitting modules by a logic device; when E2PROM in one optical receiving and transmitting module need to be read by CPU, the CPU writes port numbers which need to be read to a register in the logic device; the I2C controller sends out operational instruction, the logic device sends the clock signals which are sent by the I2C controller to the corresponding optical receiving and transmitting modules, and therefore, the information of E2PROM in the inserting and pulling optical receiving and transmitting modules is read. The present invention conveniently connects the I2C interfaces of the inserting and pulling optical receiving and transmitting modules of the CPU, GBIC, or SFP, etc., and realizes that the information of the E2PROM in the optical receiving and transmitting modules is read by the I2C controller, and the hardware cost of the system is saved.

Description

Read the method and apparatus of the inner E2PROM of plug optical transceiver module of broadband network equipment

Affiliated technical field

The invention belongs to computer network communication field, be specifically related to a kind of method and apparatus that the inside E2PROM of plug type optical modules such as realization SFP and GBIC reads on the broadband device of high density port.

Background technology

In having the broadband network equipment of optical fiber interface, the optical transceiver module of emerging plug type obtains increasing the application.The optical transceiver module of plug type mainly contains two kinds of packing forms, comprises gigabit interface modular converter (GBIC, G-igabit Interface Converter) and Small Form-Factor Pluggable module (SFP, SmallForm-Factor Pluggable).With respect to traditional fixed optical transceiver module, the optical transceiver module of plug type have can hot plug advantage, thereby make the user of the network equipment reduce cost and obtain greater flexibility.

Multilateral accord (MSA at GBIC and SFP, Multi-source Agreement) in, the optical transceiver module inside of having stipulated GBIC and SFP has a slice electricallyerasable ROM (EEROM) (E2PROM, ElectricallyErasable Programmable Read Only Memory), the information such as manufacturer, sequence number, transfer rate, wavelength, transmission range that wherein has optical module.An I2C interface is provided in the external interface of GBIC and SFP module, and system reads the information among the E2PROM of optical transceiver module inside by this I2C interface.When the user changed optical transceiver module, system is the configuration information of update system at any time like this.

I2C interface in GBIC and the SFP standard and the I2C interface of general serial E2PROM are basic identical, and difference is that the I2C address of the E2PROM in the optical transceiver module can not be set to " 000 " in optical transceiver module inside by external setting-up.The I2C universal serial bus of standard is to distinguish different equipment by the address of equipment, the corresponding unique address of each equipment on the I2C bus, like this when the address of all GBIC and SFP optical transceiver module all is " 000 ", if the structure according to the I2C bus of standard connects all GBIC or SFP module, can't distinguish each equipment.Therefore need new connected mode be proposed at the I2C interface of GBIC and SFP optical module.At present, a kind of mode is to provide an independent I2C interface at each module, when system controller or CPU read the E2PROM of each optical transceiver module inside, respectively each interface is operated.Such way shortcoming is that occupying system resources is more.Especially now the port density of broadband device is increasing, and interface module of the equipment that has has and surpasses 20 optical fiber interfaces, adopts this mode can take a large amount of system hardware resources.

Summary of the invention

The object of the invention: overcome the deficiency of the read method of the inner E2PROM of above-mentioned existing plug type optical module, provide a kind of on the broadband network equipment of high fiber port density the read method of the inner E2PROM of plug type optical module.

Technology contents of the present invention: the read method of the inner E2PROM of a kind of pluggable light transceiving module of broadband network equipment may further comprise the steps:

1, the clock signal of I2C controller is connected with the I2C interface of several pluggable light transceiving modules by logical device;

2, when CPU need read the E2PROM of some optical transceiver modules inside, write the port numbering that need read to the register of logical device;

3, send operational order by the I2C controller, the clock signal that logical device sends the I2C controller is issued corresponding optical transceiver module;

4, read the information of the inner E2PROM of pluggable light transceiving module.

The equipment that the inner E2PROM of a kind of pluggable light transceiving module of realizing broadband network equipment reads, the I2C interface that comprises an I2C controller and several pluggable light transceiving modules, the clock signal of I2C interface is connected to the I2C controller by logical device, the inner port numbering with a register holds optical transceiver module of logical device, the data-signal of the I2C controller then data-signal of direct and all optical transceiver modules couples together.

Technique effect of the present invention: the clock signal of the I2C interface of several optical transceiver modules is connected on the interface logic device of CPU, be connected on the I2C controller of CPU by logical device again, can realize the I2C interface of optical transceiver module and being connected of I2C controller easily, when CPU need read the E2PROM of some optical transceiver modules inside, CPU at first writes the port numbering that need read to the register of logical device inside, send operational order by the I2C controller then, the clock signal that logical device sends the I2C controller is issued corresponding optical transceiver module, thereby realize reading the information of the inner E2PROM of optical transceiver module that needs, and make system's economize on hardware cost by the I2C controller.

Description of drawings

Electrical block diagram of the present invention.

Embodiment

The module board with optical fiber interface with BigHammer 6808/6802 series of products of Harbor Network is an example, BigHammer 6808/6802 serial wide-band exchange unit is by some business boards with optical fiber interface, such as the BH-24GE-SFP module board, have 24 Gibabit Ethernet SFP interfaces, this veneer utilization the present invention has realized reading the E2PROM information of 24 SFP inside modules.A used integrated I2C controller of master cpu on the veneer, serial clock (the SCL of the I2C interface of 24 SFP modules, serial clock) signal is connected on the interface logic chip of CPU, be connected to by logic chip on the I2C controller of CPU, when having detected the SFP module, system is inserted on the veneer, CPU at first writes the port numbering that need read to the port numbers register of logic chip inside, reads the information of the inner E2PROM of SFP that needs then by the I2C controller.With reference to figure 1, realize that the equipment that the inner E2PROM of pluggable light transceiving module of broadband network equipment of the present invention reads is, the SCL of I2C controller inserts in the logic chip, drawing the SCL signal by logic chip receives respectively on the SCL signal of GBIC or 8FP module, the port numbering of the inner optical transceiver module with register holds CPU appointment of logical device, and the serial data of I2C controller (SDA, serial data) signal then directly and all GBIC and the SDA signal of SFP module couple together.When CPU need read the E2PROM of some GBIC or SFP inside modules, at first the register to logical device inside writes the port numbering that need read, send operational order by the I2C controller then, because the response of I2C slave unit is to lean on the negative edge of clock signal to activate, so the clock signal that the I2C controller sends is only issued corresponding optical transceiver module, other optical transceiver module then is subjected to less than clock signal, guarantees that CPU can read correct information.When the optical transceiver module in the system is many, consider the driving force of I2C controller, the SDA signal of all SFP modules is divided into three groups, and every group of 8 signals are connected together, and are switched by analog switch by logical device.Now many general CPU are integrated I2C controller, PowerPC series as Motorola, use being connected of I2C interface that the present invention can realize CPU and GBIC or SFP module very easily, realization reads the information of the inner E2PROM of optical transceiver module that needs by the I2C controller, and makes system's economize on hardware cost.

Claims

1, the read method of the inner E2PROM of a kind of pluggable light transceiving module of broadband network equipment, for it is characterized in that may further comprise the steps:

(1) serial clock signal of I2C controller is connected with the I2C interface of several pluggable light transceiving modules by logical device;

(2) when CPU need read the E2PROM of some optical transceiver modules inside, write the port numbering that need read to the register of logical device;

(3) send operational order by the I2C controller, the serial clock signal that logical device sends the I2C controller is issued corresponding optical transceiver module;

(4) read the information of the inner E2PROM of pluggable light transceiving module.

2, a kind of device that reads the inner E2PROM of pluggable light transceiving module of broadband network equipment, the I2C interface that comprises an I2C controller and several pluggable light transceiving modules, it is characterized in that: the serial clock signal of described I2C interface is connected to the I2C controller by logical device, the inner port numbering with a register holds optical transceiver module of logical device, the serial data signal of the optical transceiver module that the serial data signal of I2C controller is direct and all couples together.

3, the device that reads the inner E2PROM of pluggable light transceiving module of broadband network equipment as claimed in claim 2, it is characterized in that: the serial data signal of described optical transceiver module is divided into some groups, by the serial data signal between analog switch connection group and the group.