User's Manual

3CC12425AAAA TQ BJA 01 Issue 01 - April 2001 - Draft 03 43/70
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4.3.3 – X21 connector
If the distance between DCE (NT) and DTE is too long, according to V11 norms, you can exchange pin
6 and pin 13 in order to get a phase inversion.
Pin 1: Screen Pin 6: S_neg Pin 11: R_pos
Pin 2: T_neg Pin 7: B_neg Pin 12: I_pos
Pin 3: C_neg Pin 8: Ground Pin 13: S_pos
Pin 4: R_neg Pin 9: T_pos Pin 14: B_pos
Pin 5: I_neg Pin 10: C_pos Pin 15: Not connected
Figure 26 – Affectation of X21 connector access points
4.3.4 – 48V connector (HE 15)
Figure 27 – Affectation of 48V points
4.3.5 – Client terminal connections
There are four types of NT units:
SHIELDED CABLES MANDATORY
9900 NCF 001
9900 NCG 001
1 x Eth 10 bt
1 x Eth 10 bt
1 x E1 (G703)
1 x T1 (G703)
female
connector
Ground
0V / +48V
-48V / 0V