SDM-9220/9230 - Comtech EF Data

Product Description
leads), and the other to carry the VF audio signals.
• Audio signals are transported over either two wires (two-wire E&M) or four
wires (four-wire E&M).
• Up to eight wires can be required in all, depending on the type of E&M used on
the PBX.
Caution: For important E&M wiring and grounding considerations, refer to
“E&M Wiring and Grounding” on page 4-21.
NOTE: You must install a ferrite on each cable connected to an E&M port on an
SDM-9220 UAC, SDM-9220 DC, SDM-9230 UAC or SDM-9230 DC.
These ferrites are not provided with the product package. For instructions,
turn to “Installing the Ferrites (EMI Filters)” on page 4-24.
5.9.2 Channelized Digital Interfaces
The following digital interface cards are available: single port T1/E1, dual port T1/E1 and
ISDN BRI S/T.
You must install a DSP module if you intend to use any of these interface cards for digital
voice or GSM. See “Installing or Upgrading the DSP Module” on page 4-5.
T1/E1 Interface Cards
Ordering part numbers:161-1032-001 for the single port interface card
161-1032-002 for the dual port interface card
• Single port interface with one RJ-48 female connector
• Dual port interface with two RJ-48 female connectors
• Two independent software configurable transceivers:
- T1 (DS1)/ISDN-PRI: Provides a 1.544 Mbps channelized digital connection
at 100 Ohms with up to 24 timeslots
- E1 (CEPT) PCM-30/ISDN-PRI: Provides a 2.048 Mbps channelized digital
connection with up to 32 timeslots, software selectable at 75 or 120 Ohms
An E1-75 connection requires an RJ-48 to E1-75 dual BNC adaptor cable
(Ordering part number: 161-0469-001) and two jumpers for each port. Refer
to “T1/E1 Interface Cards at 75 Ohms” on page 5-20, and “E1-75 Jumpers”
on page 4-12.
In addition, you must install a ferrite on each coaxial cable connected to
an E1-75 port on an SDM-9220 DC or SDM-9230 DC in all countries.
These ferrites are not provided with the product package. For instructions,
turn to “Installing the Ferrites (EMI Filters)” on page 4-24.
Memotec Inc. 5-17