3/23/2012

EnGenius SN920ULTRA 900 MHz DSS Expandable Cordless Phone Review

EnGenius SN920ULTRA 900 MHz DSS Expandable Cordless Phone
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(More customer reviews)
My principal reasons for purchasing the EnGenius SN920 Ultra were:
1) supported multiple remote handsets
2) could be expanded to support multiple incoming lines
3) operated in the 900MHz band
The 900MHz band was a key issue, since I planned to install an IEEE 802.11b RF LAN, which operates in the 2.4GHz band. This ruled out any of the 2.4GHz phone systems, since they would interfere with the phone and vice-versa.
The EnGenius SN920 works fine from a technical standpoint, but there are numerous quirks about the phone, especially with regards to 'human factors' issues:
1) Voice quality is good, but not as good as a Motorola STARtac. This is surprising since the SN920 uses ADPCM digital encoding. Also, the speaker has very poor low frequency response, likely due to the small size of the phone, and is nowhere as good as a traditional corded phone.
2) A very annoying trait is that when you pick up the phone from its cradle, the caller ID info disappears! This forces you to crouch down to view the caller ID, which is inconvenient.
3) When the phone is not in its cradle, you answer it by pressing 'TALK', which is fine. Unfortunately there is no way to configure the phone to require 'TALK' to be pressed when it is picked up from its cradle, so picking up the phone that is already in a cradle versus not in a cradle is *different* and annoying. Half the time, we have to press 'TALK' twice, since you shouldn't press 'TALK' after you pick it up from a cradle. Although this sounds like a trivial nit, it really is a hassle.
4) I would not recommend this phone for older people, especially those who have arthritis. The phone is smaller and heavier than most, but it is too heavy for a moderately infirm person to hold for a long time. The buttons are also harder to push. The phone was designed this way for heavy-duty industrial environments, but it does make it difficult to use if you are 80 years old and have arthritis.
So, keep these issues in mind if you are considering this phone. From a system design standpoint, the ability to add multiple lines and handset is great, and the fact that it operates in the 900MHz is a major plus if you are planning to install a 802.11b RF LAN. (I'm surprised that cordless phone system vendors are not considering this issue more; I've talked to Apple and Siemens and they have confirmed that 2.4GHz phones and 802.11b RF LANs can and do interfere with each other.)

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Create your own cordless network with the EnGenius industrial cordlessphone system. This phone combines the flexibility and features of a cordlessphone with the power of a two-way radio. Plus, the EnGenius transmits at up to900 milliwatts--about four times the power of most cordless phones--for a rangein excess of 8.8 miles and the ability to penetrate up to 12 floors inside abuilding. This phone is ideal for communication throughout a warehouse, officebuilding, or farm.
This EnGenius system consists of a base unit, one handset, a NiMH battery packwith 80-minute fast charger, and two AC/DC adapters. Each base unit can supportup to nine handsets (sold separately), and each handset can be registered withup to four base units. The system is expandable to up to four lines with fourbase units and 36 handsets. Network features include hold, call transfer, callmanager, and a programmable ring feature that allows you to select each handsetto ring with every incoming call or only ring for transferred/intercom calls.
The EnGenius system features full-duplex capability that allows handsets tocommunicate with each other as two-way radios. A long antenna is included witheach handset to maximize range in open areas. Independent of the base, full-duplexcapability lets you talk and listen at the same time with no groupchatter and with the convenience and comfort of a phone handset. Digital spreadspectrum technology means the phone hops frequencies more than 200 times persecond, ensuring privacy.
Other phone features include call waiting and caller ID compatibility, 30presets for speed dialing, selectable three-level ringer volume, and six-levelvoice volume. The handset operates on a NiMH rechargeable battery for threehours of talk time and 40 hours of standby time. A trickle charger is included,and you can even charge the battery while a caller is on hold at the baseunit.
This phone comes with a one-year warranty.

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