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Appendix 20: Cable Specifications
TANDBERG MXP and Classic Endpoints that support External
Network
External Network Pinout
With respect to signals on the NET port:
• For balanced signals a “0”=low voltage is defined as terminal A positive with respect to
terminal B.
• For unbalanced signals a “0”= low voltage is defined as terminal positive with respect to
GND.
Pinout on 26-pin HD connector J5
Standard
Call control (menu
setting)
Mnemonics
Pin
numb
V35 RS449 RS366 X21
Signal
dir.
RS366
Leased
line
Data
trig.
Manual
1 GND GND GND GND Frame Ground (connected
to GND)
2 DPR Output
x
Digit present
3 ACR Input x Abandon Call & Retry
4 CRQ Output x Call Request
5 PND Input x Present Next Digit
6 DLO Input x Data Line Occupied
7 NB1 Output x Digit bit 1
8 NB2 Output x Digit bit 2
9 NB4 Output
x
Digit bit 3
10 NB8 Output x Digit bit 4
11 SD (A) SD (A) T (A) Output x x x Send Data / Transmit
12 SD (B) SD (B) T (B) Output
x x x
Send Data / Transmit
13 RD (A) RD (A) R(A) Input
x x x
Receive Data
14 RD (B) RD (B) R(B) Input
x x x
Receive Data
15 SCR
(A)
SCR(A) S(A) Input
x x x
Signal Clock Receive /
Receive Timing
16 SCR
(B)
SCR(B) S(B) Input
x x x
Signal Clock Receive /
Receive Timing
17 SCT
(A)
SCT(A) Input
x x x
Signal Clock Transmit /
Send Timing
18 SCT
(B)
SCT(B) Input
x x x
Signal Clock Transmit /
Send Timing
19 GND GND GND
20 TR (A) C(A) Output x x Terminal Ready / Control
21 TR (B) C(B) Output x x Terminal Ready / Control
22 RLSD
(CD)
RR (A) I (A) Input x x Received Line Signal
Detector / Carrier Detect /
Receiver Ready /
Indication
23 GND
(RLSD)
RR (B) I (B) Input x x Received Line Signal
Detector / Carrier Detect /
Receiver Ready /
Indication
24 RI IC Input
x
Ring Indicator / Incoming
Call
25 LOS LOS Output x x Loss Of Signal
26 DTR Output x x (Data) Terminal Ready