Samsung DCS Application Note No 14 - Issue 01
For Further Information Call LSP Communications
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.