10
SYNCHRONOUS MODEM ELIMINATORS SME–422, –V.35, –530, –X.21
Table 3-3. SME–530 Strap Settings
STRAP
FUNCTION
W1
This strap is used to tie the chassis ground (Pin 1) and signal ground
(Pin 19) together. The unit comes from the factory without the grounds
tied common.
W2
Test Mode (TM) on J1 (Pin 25) is either connected to –5 V (A-B) or +5V
(B-C).
W3
Test Mode (TM) on J2 (Pin 25) is either connected to –5 V (A-B) or +5V
(B-C).
W4
In the A-B position, DCE Ready on J1 (Pins 6 and 22) is “OFF” and
connected to DTE Ready (Pins 20 and 23). In the B-C position, DCE
Ready is “ON.” The unit is shipped from the factory with DCE Ready
OFF (A-B).
W5
In the A-B position, DCE Ready on J1 (Pins 6 and 22) is “OFF” and
connected to DTE Ready (Pins 20 and 23). In the B-C position, DCE
Ready is “ON.” The unit is shipped from the factory with DCE Ready
OFF (A-B).
W6
Sets the Clear to Send delay on J1:
Position A = 0 ms (no delay)
Position B = 10 ms
Position C = 50 ms
The unit is shipped from the factory with the delay set for 10 ms.
W7
Sets the Clear to Send delay on J2:
Position A = 0 ms (no delay)
Position B = 10 ms
Position C = 50 ms
The unit is shipped from the factory with the delay set for 10 ms.
W8
In the A-B position, Received Line Signal Detector (RLSD) on J2 (Pins 8
and 10) is derived from Request to Send on J1 (Pins 4 and 19). In the B-
C position, RLSD on J2 is constantly held ON. The unit comes from the
factory with RLSD derived from Request to Send (A-B).
