Primary rate (PRI) ISDN is supplied over a 2megabit Digital Data Service and this DDS needs to be installed before PRI ISDN is enabled. PRI can provide up to 32 64Kbit B channels, number from 0 to 31. Channel 15 is used for control and management of the other B channels, Channel zero is reserved for timing management. This leaves 30 64Kbit channels for use as dial in/dial out lines.A major feature with ISDN in most countries apart from New Zealand is that Caller Line Identification (CLI) is available. This is often used as a security measure with data circuits sometimes in addition to the more standard forms of user access security. Telecom NZ have said that CLI will become available after certain issues relating to privacy have been worked through. In early 1996 there have been live trials of CLI in certain regions but as yet there is no definite date for it to be generally available either with ISDN or normal phone circuits.
Unofficially the Telecom policy seems to be to upgrade an exchange if there
are several definite orders for ISDN. The exact number required has never
been disclosed but one or two orders is insufficient.
Sufficient complaining and pointing out that other residential exchanges
nearby have ISDN capability has spurred Telecom to reconsider and
implement the exchange upgrades.
One reason given for this policy was the high cost and limited availability of the exchange isdn equipment.
Telecom seem to order the equipment on a minimal basis. A significant growth in popularity of a service will usually lead to an equipment shortage and subsequent long lead time to install ISDN. A similar situation exists with Digital Data Services.
This depends on your location. Ask Telecom.
For major cities there is a $400 installation fee and then BRI rental is $150 per month.
In the central business district of Auckland the monthly rental is $120 per month.
The installation may be more if Telecom have difficulty in getting additional copper cables into your property.
They may also charge extra if additional cables need to be laid in the street or other lines used for voice phone need to be doubled up (1+1) to vacate a copper pair for your ISDN connection.
If you do get such a quote then NEVER accept it without a full explanation and insist on getting this in writing.
Always complain about such additions as the base fee of $400 should take such extra provisioning into account.
Very often Telecom will give way and waive extra charges or be prepared to meet some proportion of them especially if the new cable(s) make it easier for them to supply additional services to other Telecom customers.
Every 64Kbit B channel connection has a per minute charge which is the same as a business telephone charge. The full peak time rate is 4c per minute with an off peak rate of 0.4c per minute starting at 10pm and lasting to 7am. There is no weekend cheap rate (at least not so far) Toll call charges apply as per normal phone calls.
When BRI is installed it uses one copper line pair. A jack point labelled with the ISDN circuit number is installed at the customer location. An rj45 plugged cable goes from this jack to an NT power supply, usually a black power brick. This plugs into the mains supply and via a second rj45 connector on the brick connects to a Network Terminator (NT) device. An output rj45 socket on the NT is for connecting to the customer supplied router or isdn modem. The cable is a standard 8pair straight through with rj45 connectors on each end (such as a twisted pair ethernet patch cable).This installation is not very neat as there are several cables between the various boxes including AC power and the isdn connection to the router. The NTU usually supplied is an NEC NT which can be wall mounted near to the ISDN wall jack or at a convenient point closer to the router equipment. The external power supply can run warm so needs to be in an open air location.
When there is more than one planned BRI circuit it may be possible for Telecom to supply a single power supply to power up to four NT units. There may also be a rack frame option available that can accomodate up to eight NT cards.
Almost every day there appears to be a new router or modem appearing in NZ for use with Basic Rate ISDN. The trend now is towards ISDN modems for dial up connections to the Internet. The home user and small business market is now looking at ISDN since analogue modems have now just about reached the technology limits with maximum throughput of 33Kbits/secFor commercial internet applications where routing is necessary (ie the connecting site has its own network that is to be connected to the internet) there have been several ISDN routers, approved for use in NZ, available for over six months.
NOTE: Customer equipment that is directly connected to Telecom's ISDN NT1 must have been approved by Telecom. Usually there will be a green tick approval label on the equipment.Routers known to work and Telecom approved are:
Network Dynamics, Christchurch
ACE 1830, ACE 1870, ACE 28x0, ACE 38x0
Cisco New Zealand, Auckland
Cisco 1003, Cisco 2503, Cisco 4x00 (4 and 8 port BRI interface modules)
Kaon Technologies, Auckland
Spider ATTO, Spider ATTO+, Spider MEZZA (with BRI card)
Megadyne Communications, Auckland
Motorola model 311 router
The above are all 'external' routers that connect to an ethernet network. Internal router cards for PC type computers are available from Cisco and several other sources.
Zyxel 2864i ISDN/v34 modem cost about $1400, Meridian, Auckland
contact: Peter Felhofer
Motorola Bitsurfer+, ISDN/v34 modem, $950, Megadyne, Auckland
contact: Peter Armstrong
3com ISDN modem, Com Tech NZ, Auckland
Cisco 200 internal PC isdn modem, Cisco NZ
contact Andrew Murray
Various ISDN modems both internal and external are now appearing at the larger PC distributors in Auckland.
With analogue modem technology having just about reached its technical limitations in speed, it has been long recognised that the next logical step in dial up connections to the Internet will be ISDN.Moving from Analogue to Digital technology will in itself lead to more reliable and noise free connections. The jump in connection speed from around 33Kbits to 64Kbits will give significant performance increases.
The time from dial up to connection is less than one second.
This will allow ISDN to appear like a DDS connection since many
Internet programs will not time out while waiting for a responce from
a remote server (at the end of a dial up ISDN connection).
It is possible to have WWW servers and other server systems that provide Internet services connected to the Internet via ISDN. The call connect time is so short that even with a security dial back system, where two ISDN calls are made before an IP link is established, timeouts will not occur due to slow connection times.
Primary Rate ISDN (PRI ISDN) services are only available at a limited
number of locations in NZ.
In Auckland PRI connections are provided at one of three main exchanges. These are Takapuna (North Shore), Mayoral Drive (Central and West Auckland), and Remuera (East and South Auckland)
Initial enquiry about PRI should be to the local Telecom Business Centre.
If it is available then on ordering it Telecom will confirm a service
installation date. This may take several weeks while available resources
are checked and made available.
The installation date is the latest date when the service will be completed and available for customer use.
Although Telecom quote a three week period for completing installation from the time of the order this is unlikely to happen. Six to eight weeks is more likely although this should reduce as more exchanges become PRI capable.
PRI ISDN requires a 2megabit DDS circuit to be installed.
The installation charge for this is $4000 if this is the first 2meg circuit installed at the customer location. If there is already a 2meg circuit installed (for Wide Band DDS, Stacked Wide Band DDS, or PRI ISDN) then the installation charge reduces to $2800.
In addition to this monthly rental there is also a per minute connect charge for each B channel (for outgoing calls only) This is the same charge levied for BRI ISDN.
PRI ISDN uses a 2megabit DDS circuit into the customer premises. This circuit uses three copper wire pairs, one for receive, one for transmit and one for control and circuit monitoring.Telecom install a wall mounted chassis knowm as a CLTE (Customer line termination equipment) with a microcomputer based terminator unit for the 2meg circuit. Each chassis can accomodate two such terminator units. Power for the TUs is obtained from the Telecom copper pairs and there is no need for the customer to provide a power outlet for the TUs. The chassis is permanently wired to the copper pairs. There are no rj45 wall sockets for the lines as provided for BRI ISDN and normal telephone lines.
Telecom can supply as part of the installation a 75ohm unbalanced to 100ohm balanced convertor. This is another wall box containing two baluns with short cables that plug into the 75ohm unbalanced sockets and two more output BNC connectors which is the G703 100ohm balanced interface.This interface will then connect into the customer supplied ISDN router equipment via an appropriate cable supplied with the router.
Recently available modem servers using PRI ISDN and providing dual mode
digital ISDN/analogue v34 connect capability have been designed for
Internet Service Provider market.
Examples of such products are:
Cisco AS5200 modem server, which can connect two E1 ISDN PRI to provide sixty dial in modems lines.
Ascend Max/PRI which can also connect two E1 ISDN PRI to provide up to sixty dial in modem lines. Ascend also have modem servers that connect to multiple ISDN BRI (up to eight in the Ascend model 1800).
Some of the pros and cons of PRI ISDN when compared to multiple Basic rate connections are:Pros:
Euro ISDN Another explanation fo ISDN service
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