Product Manual - DM991 Series V Family - 204.4092.08
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•
Digital interface pins (V.35 - V.36/V11) available for connection through the DB25 female
connector;
•
The IN and OUT signals of the E1 interface are available for connection through the BNC
(coaxial cable 75ohms) or through the RJ48 connector (twisted pair, 120ohms), in the
back panel (for DM991C/CE). The pinout can be seen on Table 15.
•
The G.703 interface of the modem is available in the pins reserved for Dial Backup in the
screw connector block or in the DB25, this configuration being done through straps (for
DM991S/SE).
•
The connection to the G.shdsl interface is available in the RJ45 connector identified with
the stamp “SHDSL” in the back panel (for DM991C/CE).
•
The connection for the G.shdsl interface is available in the TX pins of the screw connector
block (for DM991S/SE).
•
The connection for the Ethernet interface is available in the RJ45 connector identified with
the stamp “ETHERNET” in the front panel (for DM991SE and DM991CE).
15.3. Accessory
15.3.1. Adapter Cable DB25 X DB25 2BNC
The modems card DM991S/DM991SE, offer a proprietor pinout for use of digital interface and E1
tributary, where these two interfaces may be available in DB25 connector of the sub rack.
For this application the DATACOM offers the adapter cable DB25 x DB25 2BNC.
This cable presents 1 DB25 male connector to be connected to DB25 of sub rack in one of sides, 2 BNC
connectors to connection of E1 interface and 1 DB25 female connector to connection of digital interface
(V.35/V.36) with ISO2110 Amd.1 standard pinout.
Figure 32.
Adapter Cable DB25 x DB25 2BNC
There must be no voltage difference between the DM991 DB9 pin 5 (signal ground) and the PC DB9 pin 5
(or DB25 pin 7). This can cause damage the DM991 and PC serial interfaces. To be sure to avoid this,
use an AC voltmeter to measure the voltage between these pins. If there is voltage difference, check if the
modem and the PC are properly grounded. It is not necessary to turn the equipment off to plug in the
serial cable, if the above conditions are met.
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 ...
