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Q. What power supply options do the Cisco 819 ISRs support?

A. The Cisco 819H(G) ISR supports both AC and DC power adapters. The DC power adapters include 12 and 24

VDC nominal vehicle power and 24, 52, and 72 VDC DC power adapters that meet railway standards. Railway

DC power adapters are referenced from Martek. They will maintain Cisco warranty and router support. The

power adapter itself is covered by Martek warranty. Please refer to Table 8 and Cisco 819 Integrated Service

Router Hardware Installation Guide for more details.

Table 8. Ordering Information for Cisco 819 ISRs with 3G Modems

Power Adapters

Nominal Input

Range

C819G+7-K9

C819G-B-K9

C819G-S-K9

C819G-U-K9

C819G-V-K9

C819HG+7-K9

C819HG-B-K9

C819HG-S-K9

C819HG-U-K9

C819HG-V-K9

C819HGW+7-E-K9

C819HGW+7-A-A -K9

C819HGW-S-A-K9

C819HGW-V-A-K9

C819HGW+7-N-K9

C819HWD-E-K9

C819HWD-A-K9

C819H-K9

PWR1-20W-AC

100-240 VAC

Yes

—

PWR2-20W-AC

100-240 VAC

—

Yes

PWR1-20W-12VDC

12 VDC

Yes

—

PWR2-20W-12VDC

12 VDC

—

Yes

PWR1-20W-24VDC

24 VDC

Q1CY13

—

PWR2-20W-24VDC

24 VDC

—

Q1CY13

Martek MBRH 0500-B/V1

24 VDC

Q1CY13

—

Martek MBRH 0500-C/V1

52 VDC

Q1CY13

—

Martek MBRH 0500-D/V1

72 VDC

Q1CY13

—

Martek MBRH 0500-B/V2

24 VDC

—

Q1CY13

Martek MBRH 0500-C/V2

52 VDC

—

Q1CY13

Martek MBRH 0500-D/V2

72 VDC

—

Q1CY13

Q. What is the 12 VDC vehicle power adapter operating range?

A. The 12 VDC vehicle power adapter has a 10 to 36 VDC operating range.

Q. What is the 24 VDC vehicle power adapter operating range?

A. The 24 VDC vehicle power adapter has an 18 to 75 VDC operating range.

Q. Can the 12 VDC vehicle power adapters be used in a 24 VDC environment?

A. Yes, you can use the 12V Nominal power supply with 24V, but only if the operating range of the 24V source is

within the 10V to 36V limits. The 12V adapter is intended to work with automotive applications that can have a

wide range of voltage under fault conditions. If your 24V source is regulated or even semi regulated, it should

have no problem powering the 12V Nominal adapter. One caution: the 12 VDC adapter does not have

electrical isolation from input to output; the input negative is connected to output negative, so the input

negative will be connected to the 819 router chassis ground.

Q. What is the IP41 rating?

A. The protection of enclosures against ingress of dirt or against the ingress of water is defined in IEC529. The

degrees of protection are most commonly expressed as "IP" followed by two numbers; for example, IP41,

where the numbers define the degree of protection. The first digit, foreign bodies protection, shows the extent

to which the equipment is protected against particles, and the second digit, water protection, indicates the

extent of protection against water. Number 4 in the first digit represents the protection against the foreign body