Warning of Failed Cascading on the MA5616 Equipped with the JDSU GE Optical Module

Keywords: MA5616, H831CCUC, JDSU (optical module vendor), GE optical module,

GE optical port cascading, cascading failure

Summary: An MA5616 equipped with the H831CCUC control board uses the

JDSU-provided GE optical module with BOM number 34060286 for upstream cascading.

The cascading fails and the LINK indicator on the control board is not on.

Product Line: Access Network Product Line    Product Model: MA5616

[Problem Description]

Trigger conditions

Two MA5616s (equipped with H831CCUC control boards) use the GE optical port for

cascading. The GE optical module is provided by JDSU and the BOM number is 34060286.

Figure 1 JDSU-provided GE optical module

 

 

Symptom

The cascading fails and the LINK indicator on the control board is not on.

Identification method

1. Perform the following three steps to verify that the device, optical link, and optical module

are functional.

a Verify that the device is functional.

The device is powered on and displays information using the serial port. The system displays

the message “Press any key to get started.” Use the user name and password to log in to the device.

Query the board information. The system displays “normal”, indicating that the device and board

are functional.

MA5616(config)#display board 0

————————————————————————-

SlotID  BoardName  Status           SubType0 SubType1    Online/Offline

————————————————————————-

0       H831CCUC   Active_normal    UP2A

1

2

3

4

5       H831PDIA   Normal

————————————————————————-

 

MA5616(config)#display board 0/0

 

—————————————

Board Name          : H831CCUC

Board Status        : Active normal

—————————————

 

Subboard[0]: H831UP2A                        Status: Normal

—————————————————————————–

Port   Port   MAC              Register             Link    Role      Active

Type                    State                State             State

—————————————————————————–

0  GE optic    normal    –      auto       auto     off   active   offline

—————————————————————————–

——————————————————————————

Port Port COMBO    Optic    MDI    Speed      Duplex    Flow- Active   Link

Type Mode     Status          (Mbps)               Ctrl  State

——————————————————————————

1 GE   –        absence  –      auto       auto      off   active   offline

——————————————————————————

Note: For a 1000 M, electrical port in the full-duplex mode, setting MDI to

any value is invalid

b Verify that the optical link is functional.

Ensure that an orange multi-mode LC/PC optical fiber is used. After the optical link starts to work,

run the following command to query the transmit and receive optical power: (The range for the

transmit optical power is –9.5 dBm to –2.5 dBm, and the range for the receive optical power is –17

dBm to 0.)

MA5616(config-if-eth-0/0)#display port ddm-info 1

Command:

display port ddm-info 1

Temperature(C)                       : 32.550000

Supply voltage(V)                    : 3.300000

TX bias current(mA)                  : 4.550000

TX power(dBm)                        : -5.010000

RX power(dBm)                        : -6.160000

c Verify that the optical module is functional.

Verify that the optical module is free of any visible damage and is not removed. Insert the optical

module to the optical port and run the following commands to verify that the optical module is

functional:

MA5616(config)#interface eth 0/0

MA5616(config-if-eth-0/0)#display port opticstate 1

Note: The type of optical module does not fully support the SFF-8472

standard. The queried information may be incorrect or unspecified

Optics module information

Identifier                        : SFP

Ext.Identifier                    : GBIC/SFP function is defined by serial

ID only

Connector                         : LC

Transceiver

Infiniband compliance codes     : Invalid

SONET compliance codes          : Invalid

GE compliance codes             : 1000BASE-SX

Link length                     : short distance

Transmitter technology          : shortwave laser

Transmission media              : multi-mode, 62.5m

Speed                           : Invalid

Encoding                          : 8B10B

BR,Nominal                        : 2100 MBits/sec

Length(9um)-km                    : 0 km

Length(9um)                       : 0.0  km

Length(50um)                      : 500 m

Length(62.5um)                    : 300 m

Length(Copper)                    : 0 m

Vendor name                       : JDSU

Vendor OUI                        : 412

Vendor PN                         : PLRXPL-VI-S24-HW

Vendor rev                        : 1

Wavelength                        : 850 nm

Cc_base                           : 0x7f

Options                           : Invalid

BR,max                            : Unspecified

BR,min                            : Unspecified

Vendor SN                         : CC17QQ322

Date code                         : 12 04 18

Diagnostic Monitoring Type        : Internally Calibrated

Enhanced Options                  : Optional Alarm/warning flags implemented

for all monitored quantities

SFF-8472 Compliance               : Includes functionality described in Rev-

10.2 SFF-8472

CC_EXT                            : 0xec

Vendor specific                   :

20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20

20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20

2. Check whether the LINK indicator on the control board is on. If the indicator is not on,

the cascading fails.

3. Query the link status of the cascaded optical port. If the system displays “offline”, the

cascading fails.

MA5616(config-if-eth-0/0)#display  port  state all

——————————————————————————

Port Port COMBO    Optic    MDI    Speed      Duplex    Flow- Active   Link

Type Mode     Status          (Mbps)               Ctrl  State

——————————————————————————

0      GE optic    normal    –      auto       auto     off   active   offline

1      GE   –      normal    –      auto       auto     off   active   offline

——————————————————————————

Note: For a 1000 M, electrical port in the full-duplex mode, setting MDI to

any value is invalid

—-End

[Root Cause]

An error occurs when the JDSU-provided GE optical module is used with the H831CCUC

control board. The LOS decision mechanism of the JDSU-provided GE optical module conflicts

with that of the H831CCUC control board. As a result, the handshake fails, causing a cascading

failure.

[Impact and Risk]

The MA5616 equipped with the H831CCUC control board is delivered with the JDSU-provided GE

optical module (BOM number: 34060286). If the GE optical module is used for cascading, the

cascading fails, affecting deployment.

[Measures and Solutions]

Recovery measures

None

Preventive measure

Configure the MAC chip register in the software.

Solution

Upgrade the control board to V800R310C00SPC103 on new sites in which the cascading is used.

[Attachment]

None

[Rectification Scope and Time Requirements]

None

[Prewarning Expiration Condition]

None

Categories:

Tags:

Comments are closed