Gci Frames, Internally Generated Frame Pulse (Line-Card Mode); Timeslot Configurations; August; Termination Mode - Intel IXP45X Developer's Manual

®
HSS Coprocessor—Intel IXP45X and Intel
The HSS also supports GCI multiplexed mode, which means a number of GCI-
compatible devices can be connected to the same serial bus, the numbers allowed are
1, 3, 4 and 8.
Figure 176. GCI Frames, Internally Generated Frame Pulse (Line-Card Mode)
hss_tx_clock
hss_tx_frame_out
hss_rx_data /
7
hss_tx_data_out
hss_rx_data /
Timeslot 1
hss_tx_data_out
hss_tx_frame _out
8 KHz frame pulse
When in multiplex mode and using 8 timeslots, GCI can support 8 ISDN transceivers (1
per timeslot).
Figure 176
Table 243.

Timeslot Configurations

Timeslot Mode
13.5.3.2

Termination Mode

This mode is a variation of Line-card mode. The frame consists of 12 sub-frames, each
containing 8 bits. Each 12 byte frame is repeated at 8 KHz, giving an aggregate data
rate of 768 Kbps.

August 2006

Reference Number: 306262-004US
®
IXP46X Product Line of Network Processors
8 KHz frame pulse
B1
6 5 4 3 2 1 0
Single Timeslot mode , 256 Kbps
Timeslot 2 Timeslot 3
Multiplexed Timeslot mode , 2048 Kbps
illustrates the frame structure used in GCI when in line-card mode.
Clock Frequency
1 512 KHz
3 1.536 MHz
4 2.048 MHz
8 4.096 MHz
1 Timeslot
B2 Monitor
7 6 5 4 3 2 1 0
clock = 512 KHz
Timeslot 4 Timeslot 5 Timeslot 6
Clock =4096 KHz
Frame Size
32 bits
96 bits
128 bits
256 bits
® ®
Intel IXP45X and Intel IXP46X Product Line of Network Processors
C/I
Timeslot 7 Timeslot 8
B4247-02
Developer's Manual
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