Black Box ME101-C, Руководство пользователя, Страница: 15 / 28

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SYNCHRONOUS MODEM ELIMINATORS SME–422, –V.35, –530, –X.21
Table 3-4. SME–X.21 Strap Settings
STRAP FUNCTION
W1 This strap is used to tie the chassis ground (Pin 1) and signal ground
(DB37 Pin 19, DB15 Pin 8) together. The unit comes from the factory
without the grounds tied common.
(Straps W2 through W7 are not used.)
W8 In the A-B position, Indication (DB37 Pins 13 and 31, DB15 Pins 5 and 12)
on J2 is derived from Control (DB37 Pins 7 and 25, DB15 Pins 3 and 10)
on J1. In the B-C position, Indication on J2 is constantly held ON. The
unit is shipped from the factory with Indication derived from Control
(A-B).
W9 In the A-B position, Indication (DB37 Pins 13 and 31, DB15 Pins 5 and 12)
on J1 is derived from Control (DB37 Pins 7 and 25, DB15 Pins 3 and 10)
on J2. In the B-C position, Indication on J1 is constantly held ON. The
unit is shipped from the factory with Indication derived from Control
(A-B).
W10 Keep this strap set for internal timing on J1 (Position A, the factory-
default setting). The SME’s internal clock is provided on Signal Element
Timing (DB37 Pins 5 and 23, DB15 Pins 6 and 13) on J1 and Byte
Timing (DB37 Pins 8 and 26, DB15 Pins 7 and 14) on J2.
W11 Keep this strap set for internal timing on J2 (Position A, the factory-
default-setting). The SME’s internal clock is provided on Signal Element
Timing (DB37 Pins 5 and 23, DB15 Pins 6 and 13) on J2 and Byte
Timing (DB37 Pins 8 and 26, DB15 Pins 7 and 14) on J1.