Specifications

4-4
Cisco ONS 15216 EDFA2 Operations Guide
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Chapter 4 Provisioning
Set Gain
Example 4-5 snmp table display local cerent15216EdfaOverallStatusGroup
Cisco15216Edfa:ONS15216 EDFA2> snmp table display local cerent15216EdfaOverallStatusGroup
CLASS CERENT-15216-EDFA-MIB.cerent15216EdfaOverallStatusGroup ::=
{
cerent15216EdfaInPoweruW = 316
cerent15216EdfaInPowerdBm = -5;
cerent15216EdfaOutPowermW = 50;
cerent15216EdfaOutPowerdBm = 17;
};
The input power should be consistent with the input power measured during the optical connection
procedure. See the “Optical Connection Procedure” section on page 3-6 for more information. The
output power value should be 22 dB greater than the input, assuming that the default gain setting is 22
dB.
Note An input power higher than –5 dBm will return a Gain Out of Range alarm that can be cleared by
correctly setting the gain value. For more information, refer to Table 2-2.
Set Gain
To ensure that the ONS 15216 EDFA2 output signal is received by the transceiver in the network
element, it is important that the gain is set correctly.
The desired output power per channel is dependent on the number of channels traversed in the amplifier.
The user sets the gain of the amplifier depending on the input power level, the network application, and
the required receiver specifications necessary for error-free operation. Gain range is provided in
Table 3-3.
To set the amplifier gain, enter the snmp attribute set local cerent15216EdfaConstGainOverallGain
{<gain #>}, where <gain #> is the gain value multiplied by ten. For example, if the gain value is 20 dB,
the gain # would be set to 200.
Note Prior to changing or implementing gain changes, consult with a Cisco Systems Engineer to ensure proper
network operation.
Set Alarm Thresholds
Alarm thresholds are set so that the network operator can be notified when valid alarms occur via the
RJ-45 ALARM OUT and RJ-45 LAN ports on the front panel of the ONS 15216 EDFA2. (See
Figure 4-1.)