Four steps to find the failure of the optical network

Look at Indicator of fiber-optic transceiver or optical module and the twisted pair port indicator is bright or not?

a ，such as the optical transceiver port (FX) indicator does not light, make sure that the fiber link is cross-linked? Fiber jumper is a parallel connection; the other end of the cross-connect.

b, A transceiver optical port (FX) light, B transceiver optical port (FX) indicator is not lit, the fault in the transceiver A-side: One possibility is that: the optical transmitter of the transceiver (TX)the mouth is bad, because the receiving optical signals B transceiver optical port (RX); Another possibility is: A transceiver (TX) port optical transmitter fiber link problems (cable or light jumper may off).

c,twisted pair (TP) indicator is not lit, make sure the twisted pair connection is wrong or connected wrong? Off tester checks; (However, some twisted pair transceiver indicator shall be fiber link connected after the bright)

d, the transceiver has two RJ45 ports: (To HUB) cable connected to the switch is a direct line; (To Node) connected to the switch of the cable is a crossover cable;

e, some hair side of the MPR switch: switch connection cable is a straight-line; DTE switch: switch connection cable is a cross-line.

(2) fiber optic cable, fiber patch cable is off?

a fiber optic cable through the off detection: laser flashlight, the sun, the luminous body facing the cable connector or a coupling according to the light; at the other end to see if there are visible?If visible light indicates that the fiber optic cable is not broken.

b, optical fiber connection off detection: laser flashlight, the sun, facing the fiber jumper, a phototherapy; see if there are visible at the other end? If visible light indicates that the fiber jumper is not broken.

Half / full duplex way is wrong?

Some transceiver side of the FDX switch: indicates full-duplex; HDX switch: that half-duplex.

With Optical Power Meter instrumentation

Under normal circumstances, the luminous power of fiber-optic transceiver or optical module: Multi-mode:-10db-18db between; 20 km single-mode:-8dB between-15db; 60 km single-mode:-5db-12db between; the luminous power of the fiber optic transceiver:-30db-5db between, you can determine this transceiver.

Growth and use of 40G and 100G optical communication module

40G dense wavelength division general optical module market is so far the first limited to 1000 km above the core long-distance optical network. Because of its good optical signal-to-noise ratio and optical nonlinear characteristics, the differential phase shift keying (DPSK) modulation and coding format is more appropriate in this application and become the primary selection of suppliers. Several different differential phase shift keying module in order to meet the different needs of the core network has been put on the market, such as partial differential phase shift keying (P-DPSK) and free spectral range (FSR) to switch the differential phase shift keying modules (Switchable of FSR DPSK).

The primary purpose of the different modules of the transmission performance of its channel spacing of 50GHz and 100GHz with different types and number of reconfigurable optical add-drop multiplexer (ROADM) dense wavelength spectral transmission system optimization . Recently, there is a new type of continuous optimization of differential phase shift keying module (CO-DPSK) market quickly by the system integrator attaches great importance to. Compared to other differential phase shift keying module, it can provide real-time and continuous optimization of the transmission performance under a variety of optical network cascade filter conditions. So it can not only maintain excellent transmission performance, but also greatly simplifies the optical transmission system with a reconfigurable optical add-drop multiplexer network maintenance. Continuous optimization of the filter shape of the differential phase shift keying module to run in real-time optimization process does not need the equivalent of the optical network, the number of cascaded filters and the effective bandwidth of the optical transmission channel pre-understand.Moreover, it is also light on the transmission channel residual dispersion, group delay ripple and nonlinear effects of signal distortion, which sparked the operative part of compensation.

CWDM SFP+

The following figure shows the CO-DPSK with a number of different other types of spectral range (FSR) DPSK module performance simulation and experimental results (Bw indicate optical channel filter based on second order Gaussian distribution pattern (SG2), the effective bandwidth ; the Exp indicate the experimental results for different FSR; the vertical axis to indicate the required optical signal-to-noise ratio) set the BER. The figure shows the effective bandwidth of a normal optical transmission channel fell from 25GHz to 65GHz within the scope of the overall CO-DPSK transmission performance than several other differential phase shift keying module has the superiority. Precisely because of this, continuous optimization module of differential phase shift keying (CO-DPSK) is considered to be a common module is especially suitable for long-distance and regional networks. Generally speaking, in these networks, the transmission quality of fiber is often good, is not simple fiber polarization mode dispersion (PMD) values ​​too much doubt.

Some of the considerations in the use of optical modules

1.10km single-mode optical module can support multi-mode fiber transmission, the transmission distance and the correspondingmulti-mode optical module is the same as in the multi-mode fiber,its transmission distance is not attenuated but the dispersion;

2.Transmission over 10km single-mode optical module in the multi-mode fiber need to pay attention to the receiving end of theoptical power can not exceed the saturation power value,otherwise it may damage the receiving device; also need to payattention to this problem on a single-mode fiber; can receivingside of the optical power before connecting test to determinewhether you can connect, if the optical power is too strong, may consider using the appropriate attenuator to increase theadditional attenuation to meet the connectivity requirements;

3. multi-mode optical module can not be transmitted on asingle-mode fiber, the major impact of the transmission distancebecause of multimode fiber attenuation is too large;

4. ceramic parts inside the optical module, pick up the optical module to be careful, if accidentally fall or hard bump, the lightmodule does not recommend re-shelves to avoid subsequentfailure;

5.To insert a fiber-optic lines in the optical module requirements movements gently insert the port facing the light, too much forceor diagonally inserted, may damage the optical module;

6. The optical port of the optical module can not be long-termexposed for long periods of time, you need to assemble on thedust cover to protect;

7.Most of the optical module index support hot-swappable, but is not recommended recurrent hot-swappable, easy to cause electrical damage;

8.Confirm swappable optical module action norms: Goldfingerpart of a light extraction module, do not touch the optical module,in order to avoid damage to optical module; b, the optical moduleis inserted to confirm the optical module handle is attached to thelight optical port on the module and then insert, just remove thelight module, do not unplug the optical port dust plugs directly into the. pull out the optical module, the first fiber optic cable pulled out, the handle pulled and light a population of about 90 degreesand slowly pull out, pull out can not be too hard or handle not in place on the pull out, there may be optical modules shielddamage.

Cisco GLC-T

Cisco GLC-T optical module SFP package electrical port optical modules. 
Cisco GLC-T optical module basic description
Module Type: SFP
Transmission distance: 100M
Transmission media: twisted pair
Interface type: RJ45
Transfer rate: 1.25Gb / s
Operating voltage: 3.3 / 5 V

Product Model: GLC-T

Product manufacturers: Fiberstore

Cisco GLC-T optical module product characteristics

◆ fully comply with the SFP and SFF-8472 standard module;
◆ Comply FE/GBE/2GBE/FC/2FC/4FC/SDH/SONET;
◆ Comply with Telcordia (Bellcore) GR-468-CORE reliability requirements;
◆ Comply with industry standard RFT Electrical Connectorand Cage
◆ the Class1 specification products, in line with IEC60825-1 and IEC 60825-2 requirements;
◆ a single +3.3 V power supply and TTL logic interface;
◆ EEPROM and serial ID card;
◆ Working temperature: 0 ~ +70 ° C (commercial grade), -40 to+85 ° C (industrial grade);
◆ Low EMI (electromagnetic interference);
◆ hot-swappable, dual-LC connector
◆ 850nm VCSELs / FP / DFB, SM / MM;
◆ RoHS-compliant products;

Cisco GLC-T optical modules range of applications: Cisco switches with SFP interfaces, routers, firewalls, …

FiberStoe is the professional Cisco Compatible GLC-T optical modules manufacturers and distributors,Please sign in : www.fiberstore.com

Best seller of Cisco SFP transceivers

SFP transceiver is capable of supporting SONET, Gigabit Ethernet, Fibre Channel, and several other communications standards. In the near future, it is going to expand to SFP+ .Then, data rates of 10 Gbits/s will be possible, including 8 gigabit Fire Channel. SFP+ modules have some of their circuitry on the outside, as compared to Xenpak or XFP type modules which have everything inside. There is a great variety of SFP transceivers available each with different transmitter or receivers. This allows the user to configure and customize the transceiver to get the proper optical reach with either multi-mode fiber or single-node optic fiber type.

Here are four categories of optical SFP modules: SX, which is 850nm, LX, which is 1310 nm, ZX, which is 1550 nm and DWDM. They all have an interface of copper cable, which allows a host device to communicate via USTP (unshielded twisted-pair) network cable. CWDM and single-optic cables also exist, and they are 1310/1490 up upstream and downstream.

GLC-SX-MM Specifications
Product Number: GLC-SX-MM
Product Name: Cisco 1000Base-SX SFP
Form Factor: Plug-in module
Device Type: Transceiver module
Product Type: SFP
Data Rate: 1Gbps
Wavelength: 850nm
Data range: 550m
Connector Type: LC Duplex
Cable Type: Multi-Mode Fiber (MMF)

GLC-LH-SM Specifications
Product Number: GLC-LH-SM
Product Name: Cisco 1000Base-LX/LH SFP
Form Factor: Plug-in module
Device Type: Transceiver module
Product Type: SFP
Data Rate: 1Gbps
Wavelength: 1310nm
Data range: 10km
Connector Type: LC Duplex
Cable Type: Single-Mode Fiber (SMF)

GLC-ZX-SM Specifications
Product Number: GLC-ZX-SM
Product Name: Cisco 1000Base-ZX 70KM SFP
Form Factor: Plug-in module
Device Type: Transceiver module
Product Type: SFP
Data Rate: 1Gbps
Wavelength: 1550nm
Data range: 70km (43.5 miles)
Connector Type: LC Duplex
Cable Type: Single-Mode Fiber (SMF)

SFP-OC3-MM Specifications
Product Number: SFP OC3-MM
Product Name: Cisco OC3 MM SFP
Form Factor: Plug-in module
Device Type: Transceiver module
Product Type: SFP
Data Rate: 155Mbps
Wavelength: 1310nm
Data range: 2km (1.2 miles)
Connector Type: LC Duplex
Cable Type: Multi-Mode Fiber (MMF)
GLC-BX-U Specifications
Product Number: GLC-BX-U
Product Name: Cisco 1000Base-BX-U BiDi TX1310/RX1490nm 10km
Form Factor: Plug-in module
Device Type: Transceiver module
Product Type: SFP
Data Rate: 1.25Gbps
Wavelength: Tx1310nm/Rx1490nm
Data range: 10km (6.2 miles)
Connector Type: LC Simplex
Cable Type: Single-Mode Fiber (SMF)

Fiber patch cord in Fiber-optic Link

Fiber Jumper Profile:

Fiber patch cord also is called fiber jumper and fiber patch cable .That is the fiber directly connected with the desktop computer or device , to facilitate device connectivity and management.Tt is used as jumper cables from the device to the optical fiber cabling link.

Structure of the fiber pach cord:

Fiber patch cord is similar with coaxial cable,just have not Mesh shield.In the Center of the fiber jumper is the  glass core of light propagation .In multimode fiber,the core ‘s diameter is  15μm ~ 50μm, broadly in line with the thickness of a human hair.Single-mode fiber core diameter is 8μm ~ 10μm. Outside the coresurrounded by a layer of lower refractive index than the core of theglass envelope, so that the fiber remained at the core. And then the outside is a thin plastic coat used to protect the envelope.

Fiber jumper Category

Fiber jumpers according to the different transmission media can be divided into common silicon-based optical fiber single-mode,multimode jumpers, as well as other fiber jumpers such as plastic,such as the transmission medium; connector structure can be divided into: FC jumpers, SC jumper, ST jumpers, LC jumpers, MTRJjumpers, jumper of MPO, MU jumper, the SMA jumper, FDDI, jumper,the E2000 jumper, the DIN4 jumper, the D4 jumper and sovariousform. The more common fiber jumper can also be divided intothe FC-FC, ​​FC-SC, FC-LC, FC-ST, SC-SC, the SC-ST.

Single-mode fiber (Single-mode Fiber): Fiber Jumper with yellowconnector and protective sleeve blue; longer transmission distance.
Multimode fiber (Multi-mode Fiber): The general fiber jumpers with orange and some gray fittings and protection apply beige or black;transmission distance is short.

 The Note for Fiber using:

Fiber jumpers at both ends of the optical module transceiverwavelength must be consistent, that is the two ends of the fiber mustbe the same wavelengths of light module, a simple distinction is thecolor of the optical module to be consistent. Under normal circumstances, the short-wave optical module using multimode fiber (orange fiber), and long wavelength modules use single-mode fiber (yellow fibers), in order to ensure the accuracy of the data transmission.
Fiber do not use excessive bending and circling, this will increasethe attenuation of light during transmission.
Must use the protective cover after the use of fiber optic jumperfiber connector protected from dust and oil will damage the optical fiber coupling.
If fiber optic connectors are dirty, then you can use a cotton swab dipped in alcohol to clean, otherwise it will affect the communication quality.

Characteristics of fiber jumpers:

(1) low insertion loss
(2) and good repeatability
(3) Return Loss
(4)Mutual insert performance
(5) good temperature stability

Application of fiber optic jumper:

Fiber Jumpers products are widely applied to: the communications room, fiber to the home, local area networks, fiber optic sensors, optical fiber communication systems, fiber optic connectorstransmission equipment, and defense readiness. Applicable tocable television and telecommunications networks, computer andfiber-optic network, and optical test equipment. Subdivision down is mainly used in several ways.
An optical fiber communication system
(2) optical access network
3 fiber-optic data transmission
(4) fiber optic CATV
(5) a local area network (LAN)
6. Test equipment
7 fiber optic sensors

Cisco GLC-SX-MM

Cisco GLC-SX-MM Overview

The Cisco GLC-SX-MM SFP transceiver is a 1000BASE-SX SFP transceiver module for MMF, 850-nm wavelength, with a dual LC/PC connector. Normally, it operates up to 550 meters in length on regular multi-mode fiber optic link spans. This GBIC is a hot-swappable input/output module that plugs into a Gigabit Ethernet slot or port.

GLC-SX-MM Compatible Cisco Routers and Switches

Catalyst Express 500 and 520 Switches
ME 2400, 3400, 3600X, 3800X, 4900X, and 6500X Switches
Catalyst 2350 and 2350 Switches
Catalyst 3000 and 3100 Switches
Catalyst 3750 Metro Switches
Catalyst 2900, 2940, 2950, 2960, 2970, and 2975 Switches
Catalyst 3500XL, 3550, and 3560 Switches
Catalyst 3750 Switches
Catalyst 4500 and 4900 Switches
Catalyst 6500 Switches
IE 3000 and 3010 Series
Cisco 2500 Connected Grid Switches
Cisco 2000 Connected Grid Routers
Nexus 2000, 3000, 4000, 5000, and 7000 Switches
CSS 11500 Switches
Cisco 892F Routers
Cisco 1921 and 1941 Routers
Cisco 2600, 2800, and 2900 Routers
Cisco 3200, 3600, 3700, 3800, and 3900 Routers
Cisco 6400 Routers
Cisco 7200, ubr7200, 7300, 7400, and 7600 Routers
Cisco 10000, ubr10000, 10700, and 12000 Routers
Cisco CRS-1 and CRS-3 Routers
Cisco ASR 1000 and ASR 9000 Routers

There are many manufacturers that produce Cisco transceivers, but you may be one of “those people” who prefer to stick with an original product. There is absolutely nothing wrong with this approach. However, the price of a Cisco GLC-SX-MM will vary greatly depending if you choose a compatible or original version.

Now, here is the fun part of promoting a product for the best company I have ever worked.FS transceiver are exclusively manufacturer-ed by FiberStore that will save you that extra money to spend in other areas of your business. The quality is the same as original, but the price is more attractive.