Nortel Networks 1000 - Manual (Page 880)

880 NTBK50 2.0 Mb PRI card
The signaling interface consists of the A07 DS-30X signaling controller.
This interface provides an 8 Kbps signaling link via the DS-30X timeslot
zero data bit zero. Messages are 3 bytes in length.
Carrier interface
For the E1 interface, the connection to the external digital carrier is
provided by the line interface chip. This device provides accurate pulse
shaping to meet the CCITT pulse mask requirements. It provides clock
recovery functions on the receive side, as well as tolerance to jitter and
wander in the received bit stream.
For the E1 interface, the connection to the external digital carrier is
provided by the line interface chip. This device provides accurate pulse
shaping to meet the CCITT pulse mask requirements. It provides clock
recovery functions on the receive side as well as tolerance to jitter and
wander in the received bit stream.
For the E-1 interface, the connection to the external digital carrier is
provided by the line interface chip. This device provides accurate pulse
shaping to meet the CCITT pulse mask requirements. It provides clock
recovery functions on the receive side, as well as tolerance to jitter and
wander in the received bit stream.
Impedance matching (Switch SW2)
The line interface provides for the use of either 75 ohms coaxial or 120
ohms twisted pair cable. The impedance is selected by SW2, as shown in
Table 373 "Impedance matching switch settings" (page 880) .
Table 373
Impedance matching switch settings
Cable Type SW 2-1
75 ohms Down (On)
120 ohms Up (Off)
Note: The ON position for all the switches is toward the bottom of the
card. This is indicated by a white dot printed on the board next to the
bottom left corner of each individual switch.
The line interface provides for the use of either 75ohm coaxial or 120ohm
twisted pair cable. The impedance is selected by SW2, as shown in the
settings table below.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
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