Nortel BCM50 2.0 Installation Manual page 37

S loops support up to seven ISDN DNs, which identify TE to the BCM50 system.
Figure 8 S reference point
BCM50
T Reference Points
The T reference point connections provide a point-to-point digital connection between the ISDN
network and BCM50. Refer to
A T loop provides lines that can be shared by all BCM50 telephones, peripherals and applications,
and ISDN TE.
Figure 9 T reference point
ISDN
A T loop can be used in combination with an S loop to provide D-packet service for a point-of-sale
terminal adapter (POSTA) or other D-packet device. D-packet service is a 16 kb/s data
transmission service that uses the D-channel of an ISDN line. The T and S loops must be on the
same physical module.
point-to-point
s
s
Figure 9.
network
connection
ISDN TE
(with terminating resistors)
ISDN TE
ISDN TE
T
BCM50
Telephony Device Installation Guide
Chapter 5 ISDN overview
ISDN TE
(with terminating resistors)
37