TANDBERG Maestro MXP - Manual (Page 251)

Peripheral Equipment
251
The pinout of the E1/T1 interface is:
PRI Pinout Crossover PRI
cable
Pin-1 RX+ 4
Pin-2 RX- 5
Pin-4 TX- 1
Pin-5 TX+ 2
Note! TANDBERG recommends always using category 5 cabling.
NET Interface:
1 x X.21 / V.35 / RS449 with 1 x RS366 Call Control up to 2 Mbps
V35:
V.10 (RS423).
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.
Cable length max: Leased Line Control = 20 Meter