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參數(shù)資料
| 型號(hào)： | MT9075 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | () |
| 中文描述： | （） |
| 文件頁數(shù)： | 13/16頁 |
| 文件大小： | 95K |
| 代理商： | MT9075 |
Application Note
MSAN-174
13
Separation of Functional
Responsibilities of AN and LE
The V5 interface specifies a separation of
responsibilities between the AN and the LE. The AN
transparently transfers the majority of the bearer and
signaling data originating at the subscriber interface
to the LE without interpreting it. The LE is
responsible for providing the service (call control,
supplementary services, etc.). The DTMF senders,
receivers, tone generators and announcements are
provided by the LE. For a PSTN interface with DTMF
capability the AN transparently conveys the in-band
DTMF signals through the bearer channels to the LE,
which uses this information for call routing and for
processing a POTS subscriber with pulse dialing
facility, the AN extracts the digits from the DC
signaling and then the digit information is packetized
and sent over though the C-channel to the LE, which
does the call routing.
The AN is responsible for handling access specific
parameters related to the protocol, such as
recognition time of analogue signals, duration,
voltage and frequency of meter pulses and related
signaling sequences specified by national standards.
The time critical responses to subscriber signaling
are handled by AN autonomously (e.g. dial tone
suppression and ring trip). The AN is also
responsible for meeting the required electrical and
protocol aspects of the subscriber ports as per
national standards. For instance in a POTS interface,
the loop length, DC loop current, ring voltage,
metering pulses, etc. should meet the specific
national recommendations.
Figure 3 shows a typical call scenario in a V5.2
interface. When the calling party goes off-hook, the
AN signals an off-hook condition to the LE. Following
this there is an allocation process in which a timeslot
on the E1 link is allocated to the subscriber. The in-
band dial tone from the LE is routed to the subscriber
using the allocated timeslot. If the calling subscriber
uses pulse dialing, the AN relays the digit information
to the LE. The ring tone and subsequently the
speech occur on the previously allocated timeslot.
When the calling party clears the call, de-allocation
occurs and the timeslot is freed up.
Figure 3 - A Typical Call Scenario (call part clears)
User Port
AN
LE
National
PSTN Protocol
Off Hook
ESTABLISH
establish_ind
ESTABLISH ACK
ALLOCATION
ALLOCATION COMPLETE
Inband Dial Tone
SIGNAL digit
SIGNAL digit
SIGNAL On Hook
SIGNAL ACK
DEALLOCATION
DEALLOCATION COMPLETE
DISCONNECT
DISCONNECT COMPLETE
establish_ack
Digit #1
(Line State
Signalling)
Digit #n
Inband Ring Tone
Seizure
Answer
Clear Forward
On Hook
Idle
Call origination
(Setup Phase)
Off Hook
Dialing
Ringing
Speech
On Hook
(Release Phase)
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