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DCS SPECIAL APPLICATIONS
COMBINED PROGRAMMING MANUAL NOVEMBER 2001
3–10
Each BRI / BRIN access has the following features:
Each port operates in either LT-T or LT-S mode. Every setting is done by MMC - there is
no jumper or DIP switch to set. You can connect an NT line or ISDN terminals. (See note,
below.)
For LT-S ports, you can decide whether or not power is supplied to that port by MMC
419.
32 numbers (DCS—range 7801 to 7832) or 24 numbers (Compact II—range 7801 to
7824) are reserved for terminals attached to the LT-S ports. Each number can be as-
signed to only one port. However, a port can have more than one number. (That is, two
ISDN terminals with the same MSN number cannot exist in different LT-S ports.)
Each S0 bus must be terminated with a 100Ω termination resistor. The original BRI cards
did not have this resistor. However, it is fitted to cards manufactured from mid 1997. It is
important that this termination is present on each installation, and should be checked by
the installer.
Note: 1. In BRI, LT-T and LT-S mode can be selected only by MMC programming. However, you
should connect the Tx and Rx cable pair from the MDF correctly. Tx and Rx connections are
reversed between LT-T and LT-S mode (see Table 15).
2. If you are connecting a T0 port to an NT, take care if there is a termination present some-
where other than on the BRI card on the bus.
ISDN Services
Outgoing calls when origination party is non-S0 terminal
When an extension seizes an ISDN TRK or S0 terminal attached to the system, the ISDN
bearer capability (BC) and high layer compatibility (HLC) will be coded as in Table 2.
ORIGINATION BC HLC
DGP (Digital keyphone) Speech Telephony
SLT (ICM/CO ring in MMC 208) 3.1 kHz Audio Telephony
SLT (DATA ring in MMC 208) 3.1 kHz Audio Telephony
Table 2 - Coding of BC/HLC when an extension seizes an
ISDN TRK or S0 terminal
Incoming calls when destination party is non-S0 terminal
When an incoming call is present on the ISDN TRK or S0 port, the call will be accepted if the
following condition is satisfied (Table 3). Calls with other BC or HLC will be rejected.