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(yè)數(shù)： 14/16頁(yè)
文件大小： 95K
代理商： MT9075
MSAN-174
Application Note
14
Layer 2 sub-layering and multiplexing
on communication channels
The
procedures are based on the LAPD protocol and
procedures defined by ETS 300 125 (Q.921) to allow
flexibility in multiplexing the different information
streams into the communication channels.
LAPV5
protocol
specification
and
the
The LAPV5 is subdivided into an Enveloping
Function sub-layer (LAPV5-EF) and a Data Link sub-
layer (LAPV5-DL). Additionally the layer 2 functions
of the AN also contain a AN frame relay sub-layer to
support ISDN (both BA and PRA) D-channel
information. All ISDN user ports within the V5
interface are uniquely identified by a envelope
function address (EFaddr). The D-channels of the
ISDN ports are not fully terminated by the AN. The
incoming D channel frames from the subscribers are
validated in the AN. The AN frame relay copies the
address, control and information content of the
incoming
D-channel
LAP
corresponding envelope function address, generates
the FCS to construct a LAPV5-EF frame, which is
transported to the LE over the C-channels.
frames,
adds
the
The LAPV5-DL handles the PSTN signaling and the
control protocol. The PSTN signaling over the V5
interface carries the PSTN signaling elements such
as the line seizure, dialed digits, etc. from AN to LE.
The LE to AN messages typically include polarity
reversal, metering pulses etc. All PSTN subscriber
ports are identified by a unique number, which is
used in the PSTN messages on the V5 interface. The
V5 specifications provide a complete set of PSTN
signaling information elements to address all the
national PSTN protocols identified to date. The entire
set or a subset of the signaling elements can be
used by the equipment provider depending upon the
national
standards.
These
messages are multiplexed at layer 3 and carried over
the layer 2 data link layer.
PSTN
signaling
Provisioning
The configuration management of the V5 interface is
implemented via the Q interface and is outside of the
scope of the V5 specifications. A parameter is said to
be provisioned if the Q interface is able to change it.
This parameter may have a default value and/or may
be altered by a local interface. Typical examples of
provisioning are the association of the bearer
channels to the user ports (V5.1), the allocation of
the EFaddr to an ISDN user port, or a L3addr to a
PSTN user port and the association of the physical C
channels to the links. Provisioning includes the
installation testing of the AN carried out prior to
connecting the AN to the LE. The V5 interface
specifies the list of parameters that must be
provisioned. Generally, the Telecommunications
Network Management function is responsible for
ensuring the configuration of the LE and the AN and
their compatibility for proper functioning of the V5
protocol.
Differences Between V5.1 and V5.2
The V5.1 ETS (ETS 300 324-1) is a complete ETS in
itself, whereas the V5.2 ETS (ETS 300 347-1)
references parts of ETS 300 324-1 (V5.1 interface).
The major differences between V5.1 and V5.2
interface are:
The V5.1 uses only one 2.048 Mb/s link,
whereas V5.2 may use N (N=1~16) 2.048 Mb/s
links on one interface
V5.1 doesn’t support concentration, whereas
V5.2 is inherently designed to support it using a
dedicated protocol known as the Bearer
Channel Connection (BCC) protocol. A single
V5.2 interface with sixteen E1 interfaces is
capable of supporting about 4000 PSTN ports
with a concentration factor of 8. The mapping of
the timeslots from user ports on to the E1 link is
done in a dynamic way
V5.1 does not support ISDN primary rate
access user ports, whereas V5.2 does.
Furthermore, the ISDN primary rate Access
shall be applicable in semi-permanent leased
line and permanent line as well as direct user
ports
V5.1 has no concept of communication channel
protection, whereas this function is available for
V5.2 when that particular V5.2 interface uses
more than one 2.048 Mb/s link. A specific
protocol, known as the protection protocol, is
provided for this function
The control protocol for V5.2 is slightly modified
to that used for V5.1. A link control protocol is
specified for V5.2 as multiple links have to be
managed
Multiple V5.1 interfaces can exist between a AN and
LE. The association of the user ports with different
V5.1 interfaces is performed through provisioning.
The V5.1 interface, however, does not support a
change of association between the user ports and
the V5.1 interfaces on a call by call basis. The V5
interface of an AN may connect to one LE or to
several LE’s.
Dual homing allows a user port to be associated via
a V5.1 interface with an LE and alternately be
associated, by re-provisioning or re-configuration, to
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