If you have been working with ISDN Voice installations for any amount of time, you know that there are several different ways to send dial tone and power to ISDN telephones. Knowing which one is the most economical and practical for a particular installation is confusing sometimes. Your choices are:
Choosing the best option for your installation depends upon several things. First and foremost is generally the cost factor. Most clients want to install the most economical (read cheapest) equipment they can obtain. The second big consideration is the number of ISDN telephones to be deployed. Then you must decide where the NT1 and Power equipment will reside. Will it go in a closet or out by the telephones? You must also consider distance parameters as wiring bus arrangements sometimes have different distance limitations. The best way to ensure a successful installation of Lucent ISDN equipment is to consult two important documents:
These can be ordered by going to: Lucent Documentation Center
After you have ordered and reviewed the Lucent Documents listed above, or if you are already proficient in ISDN installation you then need to select the right NT1 and Power Equipment for the job.
The following options are suggested based upon the criteria listed above. Please keep in mind the power requirements of the ISDN telephones and NT1s you select. Power draw can run anywhere between 2 watts up to 6.5 watts for telephones, and averages about .75 watt per NT1. As always, when in doubt - call us. 336.299.4409
Local NT1 and Power - Less than 24 stations (telephones) and/or closet limitations.
Recommendation: 1215A Local Power Supply (30 watt, switched) and Lucent NT1B-300 network Termination Device. This provides dial tone and power to two (2) ISDN telephones in multipoint mode per NT1B-300/1215A combination.
Distributed Power and Rack-Mounted NT1s - Most common choice for larger installations. Review the recommendations below:
NT1 Positions and Qty of ISDN Telephones to run |
NT1 Model Choices and Mounting Racks with Power and Reserve Battery |
Battery Hold-Over times |
||
NT1B-300 |
NT1P-230 | NT1D-300 | ||
| 12 NT1s for 24 ISDN Telephones | PoweRack PR300-24 | PoweRack PR230 | N/A | 2 Hours |
| 24 NT1s for 48 ISDN Telephones | PoweRack PR300-48 | PoweRack PR230 Expansion | N/A | 2 Hours |
| 36 NT1s for 72 ISDN Telephones | PoweRack PR300-72 | PoweRack PR96-8 | PoweRack PR180 | 1 Hour |
| 48 NT1s for 96 ISDN Telephones | PoweRack PR300-96 | PoweRack PR96-8 | PoweRack PR180 | 1 Hour |
| 90 NT1s for 180 ISDN Telephones | N/A | N/A | PoweRack PR180 | 1 Hour |
| Optional External Battery Pack for extra Hold-Over | BP-2/BP-8 | BP-8 | BP180 | 1 Hour |
Additional to the above recommendations, there are other options for Distributed Power and NT1 Racking. We recommend the above because of availability, use of current technology, and pricing.
The proper pin-out for S/T interface jacks and connectors is very important. Many times it's tempting to use pre-existing wire runs on site to reduce cut-over times. In many cases this can be accomplished with no problems - as long as you verify the power field and dial tone pin-outs. Here is a guide to follow:
You are cordially invited to contact us regarding your ISDN needs and requirements.
Call us: Phone: (336) 299-4409 or Fax us: (336) 856-1342IDS Technologies, Inc. 3714 Alliance Drive, Suite 105 Greensboro, North Carolina 27407 USA
IDS for ISDN Telephones
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