NetPerformer Hardware Installation Guide
4-34 Memotec Inc.
• 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.
NOTE: Except for the SDM-9140, you must install a ferrite on each cable
connected to an E&M port on an SDM-9XXX Series unit. These ferrites are
not provided with the product package. For instructions, turn to “Installing the
Ferrites (EMI Filters)” on page 3-27.
Channelized Digital Interfaces
The following digital interface cards are available: single port T1/E1 and dual port T1/E1.
You must use DSP resources if you intend to use any of these interface cards for digital
voice. See “DSP Resources” on page 4-21.
T1/E1 Interface
Cards
Ordering part numbers for SDM-9220/9230:
161-1032-001 for the single port interface card
161-1032-002 for the dual port interface card.
Ordering part numbers for SDM-9120:
161-1332-001 for the single port interface card
161-1332-002 for the dual port interface card.
Ordering part numbers for SDM-9140:
161-1432-001 for the single port interface card
161-1432-002 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 adapter cable
(Ordering part number: 161-0469-001) and two jumpers for each port. See
“T1/E1 Interface Cards at 75 Ohms” on page 4-36, and “E1-75 Jumpers” on
Caution
For important E&M wiring and grounding considerations, refer to “E&M
Wiring and Grounding” on page 3-24.
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