Table of Contents
Advertisement
10.3.2 Board Strapping
Leased Line Board
789
•••
10 11
••
12 13
B1
C1
01
• •
14 15
• •
20 21
(See
• •
note)
22 23
• •
24
•
16
B2
C2
02
•
17 •• 18
•
19
Note:
Some 1200 bps modems do not have
pins 20 through 24.
Switched Network Board
No straps are required on board for a switched
network.
E1
•
6
•
5
•
4
E2
For 2-wire, attach
For 4-wire, attach
jumpers from:
jumpers from:
8 to 9
7 to 8
12 to 13
10 to 11
14 to 15
Clear-To-Send Delay
1
Echo Clamp2
For:
Strap:
For:
Strap:
200 ms
17 to 19-130 ms
20 to 21 and 22 to 23
75 ms
17 to 18--50 ms
20 to 21 and 22 to 24
25 ms
17to 16-0ms
22 to 23
IThe clear-to-send delay selected must be the same for
all modems on a network. For 2-wire networks, the
clear-to-send delay is normally 200 ms. The 75 ms
clear-to-send delay can
be
used on 2-wire networks
only when the network is short; turnaround is critical,
and the network characteristics are suitable (minimum
echo).
2The echo clamp must be compatible with the clear-to-
send delay (200 and 130, 75 and 50, or 25 and 0).
Data Communications
10-7
Advertisement
Table of Contents
