2-7
AC15
This card contains three 4-wire AC15 tie lines. It can be inserted in any universal card slot in
any cabinet. This card can be used for two-way DDI calling.
TEPRI Digital Trunk
When programmed as an E1, this card provides up to 30 trunk circuits in any combination of
the following:
y
Loop start lines
y
DID (Direct Inward Dialling)
y
E&M tie lines or two-way DID calling
When the card is programmed as a PRI, it will provide 30 bearer channels and 1 data
channel (30B+D). This card can be installed in any of the first three slots of any cabinet.
4BRIN (Basic Rate Interface–4BRI)
The 4BRIN card supports four trunk or station level ISDN Basic Rate Interface (i.e., 2B plus
D) circuits. The 4BRI can be inserted in any universal slot.
Media Gateway Interface (MGI) Cards
Two types of MGI card are available—MGI2 and MGI3—which provide a Voice over Internet
Protocol (VoIP) gateway between IP and non-IP parts of the telephone system, as well as
Codec conversion. Each is described separately, below. The main features and
characteristics of MGI cards are:
y
On-board Flash memory and data memory
y
Echo cancellation function supported
y
Silence suppression function supported, preventing data transfer on the network for the bri
ef silent intervals between words during calls
y
MGI2 supports G.711 and G.729 Codecs
y
MGI3 supports G.711, G.729, and G723 Codecs
y
Both cards support T.38, H323 (version 4), and SIP protocols
MGI2
Provides a 16-channel interface using the G.711 and G.729 Codecs. Used to connect IP
terminals on the LAN, wide area network (WAN) or internet. A maximum of five cards can be
installed in a system
MGI3
Provides an 8-channel interface using the G.711, G.723 and G.729 Codecs for speech
compression and T.38 protocol for fax or IP communication. Acts as a universal gateway for
generic types of VoIP handsets. A maximum of two cards can be installed in a system.
