Field Notice: FN - 63621 - RF38 - GainMaker 4 Port Node with a DOCSIS Transponder Might Cause Transponder Communication Problems when Reverse Signals are Combined at Output of Rx - Utilize the New OIB

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Updated:May 10, 2013
Document ID:FN63621

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Field Notice: FN - 63621 - RF38 - GainMaker 4 Port Node with a DOCSIS Transponder Might Cause Transponder Communication Problems when Reverse Signals are Combined at Output of Rx - Utilize the New OIB

May 10, 2013

NOTICE:

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.

Revision History

Revision Date Comment
1.0
10-MAY-2013
Initial Public Release

Products Affected

Products Affected Comments
ON38 - 4043083 
GainMaker 4 Port OIB Kit 
ON38 - 447G213211115XXD  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G213211117AX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G213211117AXD  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G213211117BX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G213211117BXD  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G213211117MX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G213211117NX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G213211117OX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G213211117PX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G213211117QX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G213211117RX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G213211117SX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G213211117TX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G213211117XX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G213211127MX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G213211127PX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G213211137BX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G213211137MX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G213211137NX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G213211137OX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G213211137PX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G213211137RX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G213211137SX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G213211137TX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211117BB1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211117MT1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118201  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118211  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118221  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118231  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118241  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118251  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118261  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118271  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118281  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118291  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118301  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118311  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118321  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118331  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118341  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118351  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118371  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118391  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118411  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118431  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118451  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118471  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118481  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118501  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118571  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118591  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G223211118XXD  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G22321111AFX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G233211117AX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G233211117BX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G233211117OX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G233211117QX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G233211117RX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G233211127TO1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G233211127TX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G243211117BB1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G243211117OQ1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G243211118B01  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G243211118BX1  GainMaker 4 Port Node 42/54 MHz 
ON38 - 447G4132111151X1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211115AX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211115BX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211115CX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211115DX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211115EX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211115FX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211115GX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211115HX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211115JX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211115KX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211115LX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211115MX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211115NX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211115OX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211115PX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211115QX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211115RX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211115SX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211115TX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211115UX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211115VX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211115WX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211117BX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211117MX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211118411  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G413211127BX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211117BB1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211117PB1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211117PO1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211117RQ1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211118201  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211118211  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211118221  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211118231  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211118241  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211118251  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211118261  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211118271  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211118281  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211118291  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211118301  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211118311  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211118321  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211118331  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211118341  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211118351  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211118361  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211118371  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211118381  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211118391  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211118401  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211118BX1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G423211119PB1  GainMaker 4 Port Node 40/52 MHz 
ON38 - 447G6132111151X1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G6132111152X1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G6132111153X1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G6132111154X1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G6132111155X1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G6132111156X1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G6132111157X1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115AX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115BX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115CX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115DX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115EX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115FX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115GX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115HX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115IX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115JX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115KX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115LX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115MX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115NX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115OX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115PX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115QX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115RX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115SX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115TX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115UX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115VX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115WX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115XX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115YX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211115ZX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211117AX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211117BX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211117MX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211117NX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211117OX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211117PX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211117QX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211117RX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211117SX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211117TX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211117XX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211137AX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211137BX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211137MX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211137NX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211137OX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211137PX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211137QX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211137RX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211137SX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G613211137TX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G623211117BB1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G623211117BP1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G623211117BX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G623211117MN1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G623211117MT1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G623211117NS1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G623211117OR1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G623211117PQ1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G623211137BX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G633211115AX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G633211115BX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G633211115CX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G633211115DX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G633211115EX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G633211115FX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G633211115GX1  GainMaker 4 Port Node 65/86 MHz 
ON38 - 447G633211115HX1  GainMaker 4 Port Node 65/86 MHz 

Problem Description

The signal from a Data Over Cable System Interface Specification (DOCSIS) transponder installed in a GainMaker 4-Port Node with an optical interface board (OIB) (part number of 4027985) could be cancelled or distorted when combined at the output of the Rx.  

Three examples of how the DOCSIS transponder signal can be combined at the output of the Rx are shown here: 

Figure 1. EDR 2:1 Tx when Rx is in Single Dual 2:1 Mode

Figure 2. EDR or bdr 2:1 Tx when Rx Outputs are Combined

Figure 3. Dual Analog Txs when Rx Outputs are Combined

Background

Introduction of the DOCSIS transponder as an option for the GainMaker 4-Port Node identified a configuration limitation not present with Hybrid Management Sub-layer (HMS) transponders. HMS transponders split off the transponder signal and feed it into the Phoenix before a combined signal at the output of the Rx. The DOCSIS transponder signal feeds directly into Cable Modem Termination System (CMTS).

Problem Symptoms

The GainMaker 4-Port Node functions properly with either the old printed circuit board (PCB) or the new PCB. There is the possibility that a DOCSIS transponder will not communicate with the CMTS when the reverse signals are combined at the output of the reverse receiver (refer to Figures 2 and 3). This possible loss of communication is due to a corrupted transponder signal that prevents recognition of the transponder by the CMTS. 

If the GainMaker 4-Port Node has a manufacture date code earlier than May 1, 2013, the OIB is the 'old' version. 

If the GainMaker 4-Port Node has a manufacture date code of May 1, 2013 or later, the OIB is the 'new' version. 

Workaround/Solution

The new OIB PCB has an attenuator pad that enables termination of one of the paths from the DOCSIS transponder to the reverse Tx. This allows only one transponder signal to be sent back to the CMTS when the node is configured for reverse segmentation and the signals are combined at the output of the reverse receiver.  

Customers have four options available to them to ensure communication between the DOCSIS transponder and the CMTS: 

  1. If the date range on the GainMaker 4-Port Node is May 1, 2013 or later, no action is required. The new OIB part is already installed.
  2. Do not combine the signal that comes out of the Prisma II Receiver (as noted in Figures 2 and 3).
  3. When DOCSIS transponders are installed in the GainMaker 4-Port Nodes prior to May 1, 2013, install the new OIB kit (partnumber 4056143) also. Customers can utilize the GainMaker 4-Port Node Installation and Operation Guide (partnumber 4031676) to update their units.
  4. Return the GainMaker 4-Port Node via a Return Material Authorization (RMA).

New OIBs can be identified by a 75 Ohm yellow pad. Refer to Figure 4 for an example and correct placement of the OIB within the node.

Figure 4. Placement of the OIB Within the Node

Refer to the GainMaker 1 GHz High Output 4-Port Node Installation and Operation Guide for more information.

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

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