Samsung dcs application User Manual
No. 14 September 1997
Topic Primary Rate ISDN
Introduction
This Application Note describes the installation, configuration and operation of the PRI cards in the
Samsung DCS for use with Telstra’s On Ramp 10, 20 and 30 Primary Rate ISDN service. The
Primary Rate Interface (PRI) is not supported on the DCS Compact.
DCS PRI ISDN Features
The DCS and Compact support Direct Dial In (DDI) and Calling Line Identification Presentation
(CLIP). The DCS system is able to display either the CLI number or the CLIP name, using a numberto-name translation table.
The DCS currently does not support Calling Line Identification Restriction (CLIR), Malicious Call
Trace (MCT) or Sub-Addressing. Customers requiring Calling Line Identification Restriction should
arrange for this facility to be provided in the network by Telstra.
The Telstra On Ramp service does not support certain MacroLink supplementary services such as
Advice of Charge. However, with the release of Version 4 Software the DCS will support the ETSI
Advice of Charge feature which we expect Telstra to release later this year.
The DCS PRI card supports on Primary Rate Access (PRA) providing up to 30 B channels. OnRamp
10, 20 & 30 provide 10, 20 and 30 B channels respectively.
Installing the PRI Card
The following restrictions apply to the installation of the PRI card into a DCS system -
• PRI cards must be installed in slots 1,3 or 5 of the DCS KSU only.
• The slot immediately to the right of the PRI card (slot 2 or slot 4 or slot 6) must be left empty.
• The PRI card has priority in the system and therefore the PRI card must be installed in card slots
to the left of any BRI or BSI cards installed.
• A maximum of 3 PRI cards can be installed in the DCS KSU.
To install a PRI card in the DCS system -
1. Turn off the power to the DCS.
2. Insert the PRI card into slot 1, 3 or 5 in the KSU. Note that the PRI card can only be fitted in the
DCS basic KSU. The PRI card will not operate in a DCS expansion cabinet.
3. Fit an RJ45 wall mount socket onto the wall within 2m of the DCS cabinet.
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4. Connect the RJ45 socket to the NT1 as per the latest version of the ACA (AUSTEL) standard
TS009 or the Customer’s Premises Cabling Manual. The ACA state that the TX and RX pairs must
be run in separate cable sheaths and recommend that each cable is screened.) The operation of the
PRI card is independent of polarity of the TX and RX pairs as PRI operates in Point to point mode
only. The connections should be made as shown below -
Description RJ45 Socket NT1
TX Pair 4 and 5 NT1 Equipment In
RX Pair 1 and 2 NT1 Equipment Out
6. The Telstra NTI has a row of status LEDs. If the DCS is connected correctly only the Power
LED will be on. If any alarm LEDs are on , check the wiring to the DCS
7. Termination resistors are fitted to the PRI card. DO NOT fit extra termination resistors.
8. Power on the system and do a ‘System Reset’ or, for a new DCS installation, do a ‘Clear
Memory’ using MMC811.
9. If the PRI card is being added to an existing DCS installation, use MMC724 to allocate line
numbers to the PRI card.
10. Configure the PRI mode for Normal/DID as required using MMC 420 (see below).
11. Configure the PRI DLSEND and DLRECV options using MMC420 (see below).
12. Do a “Card Restart” on the PRI card using MMC418. (The DID/Normal programming will not
take effect until the card is reset).
Trunk Numbering
The DCS assigns a line number to each B channel of each ISDN line in the system ie. Thirty (30)
numbers per PRI card. After doing a ‘Clear Memory’ with MMC811, the DCS will assign numbers to
the PRI card in the 700 number range, the same as with analogue trunks. For example, on a DCS with
a TRK-A card in slot 1 and a PRI card in slot 2, the PRI card is assigned line numbers 703 to 732. If a
‘Clear Memory’ is not done after installing the PRI card, the line numbers for the PRI card will have to
be assigned using MMC724. The ISDN lines can be assigned to line keys using MMC 722, the same
as with analogue lines. From a system users point of view, the ISDN lines appear to operate like a
normal PSTN line.
PRI Mode
The PRI card can be configured for two different modes using MMC 420 -
• Normal
• DDI (indial)
Primary Rate ISDN is only offered in a Point to Point mode. Ie. The DCS is the only device connected
to the PRA.
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In Normal mode the incoming calls are routed according to the trunk ring assignment in MMC 406.
Calls on unassigned lines are routed to the operator group.
In DDI mode the incoming calls are routed in accordance with the DID Table (MMC714).
Unrecognised numbers are sent to the operator group.
Outgoing calls can be made as usual in both modes.
Other MMC420 Options.
MMC420 presents extra configuration options as well as the PRI mode described above. The other
parameters should configured as described below.
PRI Mode
Options Normal or DDI, as described above
DLSend
Options Overlap or Enblock. Leave this parameter set to its default value of Overlap.
DLReceive
Options Enblock or Overlap. Leave this parameter set to its default value of enblock.
Note : This option is not included in Version 4.X software because if the sending complete is not
included in the incoming SETUP message, the DCS will wait for additional digits to come automatically.
PRI-TRK Channel Any
Options Yes or No. This parameter should be set to Yes to tell the DCS to use any idle B channel on a
PRI line if the user presses a line key. If you wish to allocate specific B channels to say different
tenants this parameter should be set to No. When set to No the B channels are selected individually like
PSTN lines.
Samsung DCS Application Note No 14 - Issue 01
For Further Information Call LSP Communications
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