Comtech EF Data SMS-301 - Manual (Page 105)

SMS-301 Redundancy Switch SDM-2020 System Installation
Rev. 3 C–3
C.1.1.2 Connect to SDM-2020 Modulator with LVDS Interface
Refer to Figure C-1.
1. Connect the “COMM” data interface connector (J1) to the DTE equipment.
Note: Equivalent cable shall be computer grade, 100
Ω, incorporating twisted and
shielded pairs. Typical length shall be
≤ 16 feet (5 meters).
2. Connect the “A” data interface connector (J2) to the prime SDM-2020 Modulator
“TX IN” (J4) connector and “AUX” (J5) connector using Cable (CA/6217) or
equivalent.
3. Connect the “B” data interface connector (J3) to the backup SDM-2020
Modulator “TX IN” (J4) connector “AUX” (J5) connector using Cable
(CA/6217) or equivalent.
SMS-301 1:1 REDUNDANCY SWITCH
J4 T X IN J3 R X O U T J5 A U X
J4 T X IN J3 R X O U T J5 A U X
S D M -20 2 0 S AT E L L IT E M O D U L AT O R
C A B LE (P L/6217)
C A B LE (P L/6217)
S D M -20 2 0 S AT E L L IT E M O D U L AT O R
(S TA N D A R D C O N F IG U R AT IO N )
J3 J4 J5
J2 (A ) J3 (B )
Figure C-1. Connect to SDM-2020 Modulator with LVDS Interface