ARIA SOHO IP Hardware Description and Installation Manual
Issue 1
BOARD INSTALLATION
December, 2008
44
4.4.5 PRHB8 (PRI and 8 Hybrid Interface Board)
The PRI and 8 Hybrid interface Board(PRHB8) is based on the existing interface described in ITU-T
Recommendations G.704, G.703 and G.823.
It covers CEPT frame format which consist of 32, 8bit timeslots, data rate at 2.048MHz. Of the 32 timeslots in a
frame, 30 timeslots are defined as information channels, timeslots 1-15 and 17-31 which correspond to telephone
channels 1-30.
The frame has a duration of 125usec and contains 32 time slots (TSs) of 8 slots. TS 0 is allocated to frame
alignment sync. And TS 16 is allocated to the signaling channel, the other TSs are available for allocation to the B
channel.
CEPT frame has four signaling bits, A, B, C and D. Signaling bits for all 30 information channels are transmitted in
timeslot 16 of frames 1-15. The PRHB8 supports pulse dialing, DTMF dialing, and MFC-R2 register signaling
(based on ITU-T Recommendation Q.440-480).
Data & bit clock are transmitted by TE slave. The ARIA SOHO IP system will be positioned as TE slave. The PLL
circuitry on the PRHB8 extracts the reference clock from the bit stream and generates the system main clock
(32.768MHz) which is synchronized with digital trunk line.
The SW4 is switch for PRI or E1 selection. The default is ON (PRI).
FIGURE 4.4.6 PRHB8
Pin assignment
LAN PORT
Connector
Pin Number
NO
SIGNAL NAME
FUNCTION
4,5,7,8 Reserved
1 TX+
Transmit
Data
2 TX-
Transmit
Data
3 RX- Receive
Data
RJ45
6 RX+
Receive
Data
