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Testing with Bourns Primary Protection with Cisco xDSL interfaces

1. Surge and Power Cross tests

Summary:

Surge and Power Cross tests were done on Cisco xDSL interfaces: CISCO877, CISCO877W, CISCO877M,

HWIC-1VDSL, and EHWIC-VA-DSL-x

All tested units pass 6000 Volts Surge testing with all variations of Bourns 7040-01 NID (Network

Interface Devices) devices.

The CISCO877 router passes Power Cross without Bourns NID devices. However the CISCO877M fails

due to oscillatory behavior when a standard voltage GDT-only device is used as Primary Protection. The

CISCO877M passes Power Cross when used with a GDT with TBU device because the TBU limits

circulating current.

The HWIC-1VDSL and EHWIC-VA-DSL-x interfaces pass power cross with GDT devices, with or without

TBU support.

Cisco CISCO888E and CISCO888EW, and HWIC-4SHDSL-E , G.SHDSL interfaces were tested per standard

K.21 testing. This G.SHDSL interface passed Power Cross with an external GDT network with no issues

during normal compliance testing. This includes the HWIC and the fixed version of this port.

Passing was determined by link up with Broadcom multimode CO simulator without loss of rate. Failure

was loss of link or lowered data rate indicating damage.

Currently the Cisco877 family is announced as EOS with last sale date of Dec 2011. HWIC-1VDSL and

EHWIC-VA-DSL-x are new products.

Conclusions:

All of the tested Cisco DSL products pass 6000 Volts Surge tests with any Bourns GDT Primary Protection

NID Device. The Cisco CISCO877M fails Power Cross due to the voltage rating of the Primary Protection

GDT versus the voltage rating of the Sidactor in the Secondary/in-circuit protection. The Bourns GDT

with the TBU allows the CISCO877M to pass Power Cross testing with transient current blocking,

damping the circulating current in the transformer.

Therefore for full coverage of Surge and Power Cross we recommend the Bourns GDT with TBU, 7040-

01-, containing a 2377-45-BC-TBU Station Protector. If Power Cross in the field is not an issue, then any

of the Bourns GDT three-pin devices, 2377-45-BC, will work. Other low capacitance three pin GDT NID

devices should work as well.

Summary of content (9 pages)

PAGE 1
Testing with Bourns Primary Protection with Cisco xDSL interfaces 1. Surge and Power Cross tests Summary: Surge and Power Cross tests were done on Cisco xDSL interfaces: CISCO877, CISCO877W, CISCO877M, HWIC-1VDSL, and EHWIC-VA-DSL-x All tested units pass 6000 Volts Surge testing with all variations of Bourns 7040-01 NID (Network Interface Devices) devices. The CISCO877 router passes Power Cross without Bourns NID devices.
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. Surge Tests Surge testing was done with three versions o f Bourns 7040 NID (Network Interface Devices) family, each containing a Station Protector module. Two of these modules are Gas Discharge Tubes without TBU® sneak current blocking and one with a TBU®. The Surge Test is a standard 10/700 us waveform based on the ITU-T K.44 generator and applied in accordance with ITU-T K.21. The test voltages were 4000 Volts and 6000 Volts. Each voltage was applied 5 times each in the positive and negative polarity.
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Data Sheet for 7040 series NID boxes with 1 or 2 Station Protector modules
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2.2.CPE Equipment Tested The CPE equipment tested was the CISCO800 series ADSL2+ routers, CISCO877M and CISCO877, and VDSL2 modular HWICs and fixed cards. All are Annex A or M (over POTS) routers with a RJ11 Tip and Ring Interface. The NID device was connected between Tip and Ring and the NID Ground connector was connected to Test Ground. Previous testing indicates that the failure voltage on the DSL isolation transformers is approximately 4000 Volts.
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2.4.10/700uS Surge Generation The Surge generator was attached to Tip and/or Ring and Ground depending on the test configuration. Both Longitudinal (earth/ground to Tip and Ring) and Metallic (signal between Tip or Ring with Ring or Tip connected to Surge Return and ground). The peak voltage and peak current were monitored at the surge generator. 3. Surge Test Results All three NID packages operated about the same when tested in either Longitudinal or Metallic configuration.
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278 678 282 684 281 700 293 687 282 1 2 1 2 0 0 0 0 1 -672 -283 -689 -286 -693 -286 -774 -285 -699 -76 -78 -78 -77 -76 -78 -68 -78 -78 Differential/Metal R-Gnd/T with Ethernet F3 and Shield Grounded V A V A 759 1 -285 -71 266 0 -763 -79 771 1 -282 -78 247 2 -762 -70 782 1 -283 -79 281 0 -828 -76 779 2 -585 -78 276 1 -750 -77 769 1 -285 -79 278 1 -767 -79 -6KV 6KV -6KV 6KV -6KV 6KV -6KV 6KV -6KV Polarity 6KV -6KV 6KV -6KV 6KV -6KV 6KV -6KV 6KV -6KV Surge tests were also done using the Bourns NID boxes
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CISCO877M. EHWIC-VA-DSL-x 4.2.
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Cisco877M failed with GDT Primary Protection 7040-01-Z or -W, but passes without GDT only Primary Protection, and passes with GDT-TBU Primary Protection. Cisco877 Passed with all NIDs. HWIC-1VDSL Passed with all NIDs. EHWIC-VA-DSL-x Passed with all NIDs. CISCO877 passed with no loss of performance. The CISCO877M with either the 7040-01-W or 7040-01-Z NID failed with either loss of performance leading to failure or failed with full loss of performance after one or two pulses.