Acquired Electronics360

Broadband

Cisco CP7960-G IP Phone Teardown

30 November 2012
The following is an overview of a teardown analysis conducted by IHS Technology Teardown Services.

Main Features / Overview

IP Phone - because of the nature of the product it is very customizable and can be updated and administrated via LAN. The Cisco 7960 IP phone has been around for some time. In fact the model we have torn down seems essentially identical to those used at iSuppli, which were purchased mid 2000. Although design revisions may have been made over time - from the outside, it appears virtually identical. It seems that this phone has a rather lengthy lifecycle.

Cisco CP7960-G IP Phone - Main PCB Top - Shielding RemovedCisco CP7960-G IP Phone - Main PCB Top - Shielding Removed
Production Volume Assumptions

For the purposes of this cost analysis, we have made an assumption that the lifetime production volume for this particular model would be 2.5M units. This figure cannot be considered to be necessarily "market accurate" but an estimate used only for the purposes of calculating certain costs which are modeled (ASICs, PCBs, plastics and custom mechanical components). Volume assumptions can have a minor affect on our cost analysis, however for the most part, for products where production volumes are at this level, fixed costs such as non-recurring engineering (NRE), tooling and other set-up costs which must be amortized over the assumed production volume. In other words, if the volume assumption is 2.5M or 5M, this typically only changes the sum total of the analysis by pennies. The volume assumption only becomes more critical in the case of very low volume productions.

Cisco CP7960-G IP Phone - Main PCB Top - Shielding RemovedCisco CP7960-G IP Phone - Main PCB Top - Shielding Removed
Cost Notes

This phone has a lot of mechanical components - and specifically a lot of discrete plastic parts and assemblies. In fact at a high level, plastics and other mechanical components and hardware are the largest single cost driver in the phone and weigh in at about $15. Most of the mechanical components are custom elements, and are therefore modeled using our proprietary plastics and metals models.

Mechanical components aside, however, from an electronic perspective the whole deisgn is relatively integrated with almost all of the cost and the bulk of the processing occurring in two key ASICs from Texas Instruments (private labeled as Cisco parts). In fact the main PCB represents all of the functional electronics in the phone and itself represents a total materials cost of about $35 of which the core TI/Cisco Asics are about $11, representing nearly one third of the BOM cost of the main PCB. Most other components, on an individual basis, are obviously cost contributors, but no one component really stands out past the first few lineitems. All of the electronic costs used here do not represent the "bleeding-edge" of market price as we see it, but rather represent a competitive high volume cost. That we would expect for Cisco.

Cisco CP7960-G IP Phone - Main PCB TopCisco CP7960-G IP Phone - Main PCB Top
Al;though we often tend, in the absence of other proof to err on the side of absolute bottom of the market pricing, in this analysis, we have taken a more conservative approach and are generally assuming that pricing is more mid-market and that there may even be room for downward cost improvement. The display module on the other hand may be a bit aggressive, only because while the monochrome segment is extremely competitive, volumes high and compeititors numerous, this display is not a size that is in the volume sweet spot for manufacturers, and may be a Cisco specific or custom model, which might add some additional cost to the display.

Cisco CP7960-G IP Phone - Main PCB BottomCisco CP7960-G IP Phone - Main PCB Bottom
Main Cost Drivers (Representing over 90% of total materials costs):

Main PCB ~$35

Texas Instruments / Cisco ASIC

Chipset $11.00

PCB substrate - 4 layer FR-4~$4.50

Memory (Flash/SRAM)~$4.50

Analog Front End Chip<~$2

Display Module (5.3" Diagonal Monochrome)~$14

Enclosures - Plastics, Metals, Hardware, Etc.~$19

Subtotal Main Cost Drivers~$68

Total Materials Costs~$75

Manufacturing and Materials*~$84



* - The total materials and manufacturing costs reported in this analysis reflect only the direct materials cost (from component vendors and assorted EMS providers), manufacturing and test. Not included in this analysis are costs above and beyond the manufacture of the core device itself - cost of shipping, logistics, marketing and other channel costs including not only the EMS provider's and OEM's margin, but that of other resellers. Our cost analysis is meant to focus on those costs incurred in the manufacture of the core device, and any literature, packaging, and accessories supplied with the phone itself.

Manufacturing Notes

Country of Origin / EMS provider

The phone was labeled as made in Malaysia, and the handset / receiver came bagged as a finished unit labeled "Made In China". Both locations have been used, applying local loaded labor rates to calculate manufacturing of the PCBA and final assembly (both assumed to be Malaysia), and used China for the manufacture of the receiver and all of the custom plastics and mechanicals.

Cisco CP7960-G IP Phone - Display Module and Mounting PlateCisco CP7960-G IP Phone - Display Module and Mounting Plate
Design for Manufacturing / Complexity

Overall - coming in at a component count of 671, the Cisco CP7960-G phone is relatively complex but falls in line with devices such as mid-range handsets (portable phones). It is hard to find a directly comparable point of comparison considering that we have not specifically torn down other IP phones.

Cisco CP7960-G IP Phone - Ethernet Connect PCB Mounted to Main PCBCisco CP7960-G IP Phone - Ethernet Connect PCB Mounted to Main PCB

From a mechanical perspective, at 135 components this model could probably stand a few improvements to lower the assembly cost. For example we were a little surprised to find out that every single rubber pushbutton in this desin was it's own discrete part. It is more common in cell phones, or even other designs such as the user interface of set-top boxes, to connect such buttons together on a sheet or interconnected using molded fingers or links to keep a cluster of related buttons together and oriented properly. This facilitates manufacturing greatly, but Cisco's EMS provider may have found some clever assembly techniques that make this a minor adder.

Design Notes

Core Processors

  • Texas Instruments - F731891PDV - ASIC
  • Texas Instruments - F731532APGE - ASIC

Other Major Chips

  • Broadcom - BCM5912KQM - Ethernet Transceiver - Dual
  • Analog Devices - AD73311L - Analog Front End - General Purpose, Single Channel, 3V

Memory

  • Cypress - CY7C1041CV33-10ZC - SRAM - 4Mb (256K x 16)
  • AMD - AM29LV800DB-70EC - Flash - 8Mb, 3V, 0.23um, Bottom Boot

Display

  • Primary: 5.3 Inch, STN Monochrome

Cisco CP7960-G IP Phone - Ethernet Connect PCB Mounted to Main PCBCisco CP7960-G IP Phone - Ethernet Connect PCB Mounted to Main PCB



Powered by CR4, the Engineering Community

Discussion – 0 comments

By posting a comment you confirm that you have read and accept our Posting Rules and Terms of Use.
Engineering Newsletter Signup
Get the Engineering360
Stay up to date on:
Features the top stories, latest news, charts, insights and more on the end-to-end electronics value chain.
Advertisement
Weekly Newsletter
Get news, research, and analysis
on the Electronics industry in your
inbox every week - for FREE
Sign up for our FREE eNewsletter
Advertisement

CALENDAR OF EVENTS

Date Event Location
30 Nov-01 Dec 2017 Helsinki, Finland
23-27 Apr 2018 Oklahoma City, Oklahoma
18-22 Jun 2018 Honolulu, Hawaii
Find Free Electronics Datasheets
Advertisement