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Installing a New System
Basic Rate ISDN Cabling
Installation & Maintenance
INDeX 30
Basic Rate ISDN S-interfaces can support single (point-to-point) or multiple (point-
to-multipoint) ISDN terminal devices. The number of devices supported depends on
the cable distances and type of wiring used.
Basic Rate ISDN T-interfaces only support single (point-to-point) connections.
Wiring Notes :
– The table below gives the maximum cable distances for 0.5 mm diameter
CW1308 wiring. Figures in brackets refer to 0.5 mm diameter CW1700 wiring.
Maximum Bus Length
1st Socket to Last Socket
Maximum No. of Sockets
CAT5 cabling can also be used for cable lengths of up to 800m.
– In all configurations, the first and last sockets must include 100Ω ±5% resistors
across the both transmit pair and across the receive pair.
– If a socket is added as a spur rather than a bus junction, the spur length must
not exceed 1m.
– All wiring must be twisted pair or quad type.
Point-to-Point Connection :
– Single ISDN Terminal Device Socket.
Point-to-Multipoint Connection :
– It is vital that wiring polarity is maintained throughout the wiring bus.
Notes:
1. In the MDF Cable Connection table (see page 17) the pin numbers shown in the
right-hand columns relate to RJ45's .
2. Ensure that both the cable and wires are clearly labelled with the connection
type. Note that each circuit displays in INDeX programming as two channels.
Connecting to the MDF - Page 17
Point-to-Point
Short Bus
400m (800m)
100m (150m)
N/A
–
1
8
Installing a New System - Page 17
38DHB0002UKDF- Issue 4 (07/2001)
Extended Bus
250m (400m)
45m (70m)
4
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