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User Manual - Configuration Guide (Volume 3)
Versatile Routing Platform
Chapter 3
E1 Voice Configuration
3-2
II. Interface divided into TSs logicailly & TS 16 not as special channel
When used as cE1 interface, all the other 31 TSs except TS0 can be divided into
several groups, with each group of TSs used as one interface (channel-group) after
being bound. Its logical attribute is equal to the synchronous serial ports of different
rates. On the interface, link layer protocols such as PPP, FR, LAPB, X.25 and HDLC,
and network protocols such as IP and IPX, are supported.
III. Interface divided into TSs logicailly & TS 16 as signaling channel
When DSS1 subscriber signaling is adopted, the interface is used as ISDN PRI
interface. Since TS16 is used as transmission connection signaling for D channel, you
can only bind TS 16 with any other TSs (except for TS0 and TS16) and use as one
interface (pri-group). Its logical attribute is the same as ISDN dial-up. On this interface,
PPP link layer protocol and network protocols such as IP and IPX are supported, and
parameters such as DDR can be configured.
When the upper layer uses R2 signaling, the contents transported in the TSs are: Every
32 TSs constitute a basic frame; every 16 basic frames constitute one multiframe; the
TS0 of every odd basic frame is used to transport the synchronous identity of the frame;
the TS16 of every odd basic frame is used to transport line signaling. In each
multiframe, the TS0 of the odd basic frame is used to transport FAS (Frame Alignment
Signal), and that of the even basic frame is used to transport NFAS (Non Frame
Alignment Signal). What transported on it is the state information about the links, which
provides control signaling for basic rate multiplexing. The 4 significant bits of the TS 16
of the first basic frame (Frame 0) of every multiframe are used to transport the
synchronous identity (Multiframe Alignment Signal (MFAS)) and the insignificant 4 bits
are used to transport asynchronous identity. The TS16 of the other 15 basic frames
transport the line state of every two TSs respectively, for instance, basic frame 1 is used
to transport the states of TS1 and TS16; basic frame 2 is used to transport the states of
TS2 and TS17.
3.1.3 Features of E1 Voice
I. Signaling modes supported
DSS1 subscriber signaling is supported on ISDN PRI interface and R2 signaling is
supported on E1 interface.
II. Protocols and standards supported
Support the relevant protocols under ITU-T H.323 frame and support the 5.3K and 6.3K
compression algorithms of G.711, G.729 and G.723.1 Annex A of ITU standard,
support CRC4 and non-CRC4 framing modes, support the two kinds of line coding of
HDB3 and AMI.
III. Support single stage dialing and two-stage dialing
It supports the two access functions of single stage dialing and two-stage dialing, which
adapts itself to the difference between various PBX exchanges in their transportation of
called numbers to the router. When one PBX exchange is transporting voice access
number to the router and the number is deleted, the router adopts single stage dialing
access mode to access the subscriber. If PBX exchange does not delete the access