Connect SFP Modules
Before you begin this task, ensure that you have read and understood the safety warnings in the
Safety
Precautions for Module Installation and Removal
section of the
Safety Warnings
chapter.
Use only Cisco SFP modules on a Cisco device. Each SFP module has an internal serial EEPROM that is
encoded with security information. This encoding provides a way for Cisco to identify and validate that the
SFP modules meet the requirements of the device.
We recommend that you wait for 30 seconds between the removal and insertion of an SFP module from the
device. The wait period allows the transceiver software to initialize and synchronize with the device. Changing
an SFP before this wait period could result in transceiver initialization issues that disable the SFP.
Caution
This section provides procedures for installing and connecting SFP modules. Also, it provides the procedure
for removing SFP modules.
Install SFP Modules
We strongly recommend that you do not install (or remove) an SFP module with its cables connected because
of the potential damage that may be caused to the cables, the cable connector, or the optical interfaces in the
SFP modules. Disconnect all cables before removing or installing an SFP module.
Removing and installing an SFP module can shorten its useful life. Do not remove and insert SFP modules
unless necessary.
Caution
The following figure shows an SFP module that has a bale-clasp latch.
Figure 29: SFP Module with Bale-Clasp Latch
Some SFP modules identify the top side of the module with send (TX) and receive (RX) has markings or
arrows that show the direction of the connection. If the SFP module that you are using has such markings,
use them to identify the top of the module.
Step 1
Attach an ESD-preventive wrist strap to your wrist and to a bare metal surface on the chassis.
Step 2
Align the SFP module at the front of the slot opening.
Step 3
Insert the SFP module into the slot until the connector on the module snaps into place at the rear of the slot.
Do not remove the dust plugs from the fiber-optic SFP module port or the rubber caps from the fiber-optic
cable until you are ready to connect the cable. The plugs and caps protect the SFP module ports and cables
from contamination and ambient light. Store the dust plugs for later use.
Caution
Cisco ASR-920-12SZ-A and Cisco ASR-920-12SZ-D Aggregation Services Router Hardware Installation Guide
48
Install the Router
Connect SFP Modules
