Product Manual - DM991 Series V Family - 204.4092.08
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(G.703) Telebrás Standard – In this option the equipment presents the G.703 interface in the TX and RX
pins of the DB25, according to the Telebrás practice 225-540-780. The digital interface will not be used
once it occupies some of its most important pins.
E12 to E15: position 0-1.
E27 to E30: position 0-1.
E44 to E47: position 0-2.
V.35 and G.703 in DB25 (G+V) – In this option, the equipment presents the G.703 interface in DB25 pins
that are not crucial for most applications that use the digital interface. The digital interface should be
configured for the ISO2110 Amd.1 standard, and signals CT106, CT108 and CT140 will not be used.
E12 to E15: position 0-1.
E27 to E30: position 0-2.
E44 to E47: position 0-1.
7.1.5. Digital Interface Selection (E16, E18 and E20)
Define if the electrical characteristics of the digital interface will be according to the V.35 or V.36/V.11
recommendation.
Position 0-1: Select V.36/V.11.
Position 0-2: Select V.35 – factory standard.
7.1.6. DB25 Connector Pinout (E31 to E41 and E48 to E59)
Allow to select the pinout standard for the DB25 connector of the V.35-V.36/V.11 digital interface.
Position 0-1: Telebrás standard pinout.
Position 0-2: ISO2110 Amd.1 standard pinout - factory standard.
7.2. DM991C/CE
7.2.1. G.703 Interface Cable Selection (E2, E3 and E25)
Position 120: selects the use of twisted pair, meaning it operates in the G.703 interface with 120ohms
impedance.
Position 75: selects the use of coaxial cable, meaning it operates in the G.703 interface with 75ohms
impedance- factory standard.
7.2.2. Input Coaxial Cable Grounding (E4)
This straps corresponds to the input line (IN) of interface E1.
GND Position: connects the external coaxial cable network to the signal ground.
ISOL Position: insulated - factory default.
7.2.3. Output Coaxial Cable Grounding (E5)
This straps corresponds to the output line (OUT) of interface E1.
GND Position: connects the external coaxial cable network to the signal ground.
ISOL Position: insulated - factory default.
Be careful as not to let those straps be in the grounded position when a twisted pair (120ohms) is used.
Summary of Contents for DM991C
Page 1: ...DM991 SERIES V DM991C DM991CE DM991S DM991SE PRODUCT MANUAL 204 4092 08 rev 08 Date 8 12 2008 ...
Page 66: ...Product Manual DM991 Series V Family 204 4092 08 66 Figure 31 LDL Test Converter Mode ...
Page 89: ...Phone 55 51 3358 0100 Support 55 51 3358 0122 Fax 55 51 3358 0101 www datacom ind br ...
