NEC NEAX NDA-24349 - Manual (Page 327)

Chapter 15 Integrated Services Data Network (ISDN)
NEAX 2000 IPS Request For Proposal (RFP) Reference Guide Page 15-11
NDA-24349, Issue 4
For connections of 24PRT and transmission line, twisted-pair cable can be used. For connection of
30PRT and transmission line, either coaxial cable or twisted pair cable can be used.
Note : ISDN requires B8ZS Line coding with Extended Superframing (ESF) format .
BRT
The Basic Rate Interface Trunk (BRT) provides one or two physical interface to the ISDN-Basic Rate
Interface service (192 kbps PCM-2B + D).
The BRT has the following functions.
ƒ Unipolar/Bipolar Conversion (AMI/B8ZS Format) (S/T Interface)
ƒ Signaling Insertion/Extraction
ƒ Frame Synchronization
ƒ Digital PAD on Voice Signal Transmission
For connections of BRT and transmission line, twisted-pair cables can be used
.
Note: We recommend the point-to-point connection when connecting the system to the public network using the
BRT card (Set the second data of CM35 Y=79 to 0). For the point-to-multipoint connection using the BRT card,
when the system is established far from the public network, a communication error occurs easily because the
ISDN signal fades away
.