Toa VS-900 - Manual (Page 40)

40
12.10. VS-900TI Tie-Line Interface Card Exchange Interconnection
Up to 16 exchanges can be tie-line interconnected using the VS-900TI card.
[Connection]
To interconnect the exchanges, use 2 twisted pair cables for lines, and a 2-core shielded cable for data lines.
A maximum of 4 lines can be connected. Refer to the following table for the maximum recommended length
for each cable type between exchanges.
(As to the cable connection, see the figure on the next page.)
Cable type AWG24 (0.52 mm) AWG22 (0.65 mm) AWG20 (0.82 mm)
Distance 0.6 km 1 km 1.5 km
[Termination resistance setting]
When interconnecting three or more exchanges, change the SJP10 connection on each card as shown below,
with the exception of the cards in the rightmost and leftmost exchanges.
VS-900
VS-900TI
VS-900TI
VS-900TI
VS-900TI
VS-900TI
VS-900
VS-900
VS-900
SJP10
SJP10
SJP10
SJP10 SJP10 CN6
R26
SJP10
SW1
Two twist pair cables (voice line)
A 2-core shielded cable (data line)
Factory-preset status of SJP10 Termination resistance setting when
interconnecting 3 or 4 exchanges