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參數(shù)資料
| 型號： | MT9075 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | () |
| 中文描述： | （） |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 95K |
| 代理商： | MT9075 |
MSAN-174
Application Note
10
depends on the number and the type of user ports
terminated by the access network. Typically one or
two physical C-channels would be sufficient to
handle 256 user ports comprised of POTS and ISDN
BA. The number of HDLC controllers in the system
depends upon the system capacity and the
modularity. The access network should have the
flexibility to add more HDLC controllers due to
system expansion through provisioning.
The MT9075 has a built-in HDLC controllers fixed on
timeslots 16 and 0. Each HDLC is equipped with
128-byte deep FIFO’s for efficient transport of data
packets. For those V5 applications with limited C-
channel requirements, the MT9075 is extremely
suitable because it reduces the need for extra HDLC
controllers. Apart from the built-in HDLC controller in
MT9075, the MT8952 single channel HDLC
controller can be used to fulfill the demand for
additional HDLC resources.
If certain applications require a great number of
physical C-channels to be allocated, then a suitable
multi-channel HDLC can be used.
3.5 Subscriber interfaces
The V5-based access network can provide a variety
of services from single telephone, PABX, ISDN basic
rate/primary rate to different types of leased lines.
Each type of access requires its own type of
interface. Mitel has total solutions for many of the
interface circuits discussed below.
3.5.1 POTS
POTs uses a 2 wire analog interface to connect to
the PSTN, which can be either single telephone or
PABX. The SLIC and codec together convert the
analog voice-band signal into 64kb/s PCM data, and
vice versa. This 64kb/s data carries one phone call
and occupies one B-channel. Supervisory signals
such as on/off-hook must be processed by a PSTN
signaling processor and sent to the LE via a C-
channel. Line impedance, network balance and
transmission loss plan are some of the factors
involved in the design of the line interface. The
National regulatory bodies specify the details of the
line interface.
The transmission loss plan of a POTs user port on
the access network is identical to that of a user port
directly connected to LE. The national regulations
that govern the transmission quality of a general 2W
analog interface also apply to 2W analog ports on
the access network.
Mitel’s MH88617 SLIC meets various national
standards
and
customer
MH88617 is a versatile part particularly designed for
AN applications. It integrates a ringing amplifier and
meter pulse injection with fully programmable line
impedance, network balance impedance and gains.
The MH88617 has programmable loop current from
14 mA up to 65 mA with more than 2 Kohm loop
capability. It supports both square-wave and sine-
wave ring with auto ring trip and line reversal. The
battery voltage ranges from -20V to -72V. As for the
codec, the MT8965 and MT8964 are A-law and u-law
respectively.
requirements.
The
3.5.2 ISDN-BA
As demands for digital service increase, ISDN basic
rate interface becomes fundamental. If any ISDN
terminal equipment will be directly connected to the
AN, a standard S interface circuit must be placed at
the access network side to provide full duplex
transmission of 2B+D data format on a 4-wire
balanced line. All D channels will be routed to the
HDLC pool where they are packetized to form the C-
channel by the frame relay sublayer. If an ISDN
network terminal (NT1) has to be connected in, then
a U-interface circuit can be used to transport 2B+D
data formats over a single twisted pair of copper
wire. The physical and data link layers of both S and
U interfaces are well defined by I.430.
The MT8930 is recommended for implementing the
S interface, respectively. The application details for
these two devices are given in [4].
3.5.3 ISDN_PRI (For V5.2 ONLY)
The ISDN BRI provides a data rate of 144kb/s, which
is insufficient bandwidth for video or multimedia
users. The V5.2 interface supports up to sixteen
2.048Mb/s links, making it possible to provide much
higher data rate service. As such, the ISDN primary
rate service is added in a V5.2 access network.
The ISDN PRI carries 30B+D data format per I.431
over a 2.048Mb/s link, which is physically identical to
the E1 interface with timeslot 16 reserved for D-
channel data. The MT9075 introduced in Section 5.1
and MT9074 meet these requirements.
3.5.4 Leased Lines
V5 supports both analogue and digital leased line.
An analogue leased line interface is the same as the
POTs interface discussed earlier, and the digital
leased line interface takes 64kb/s DS0 format
specified in G.703. The B channel of both ISDN
basic and primary access can also be used for
leased line services.
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