Black Box LR1530A-EU-R3 - Manual (Page 20)

Installation
14
Some E1 service providers reserve timeslot 16 for network
management use. If your service specifies that timeslot 16 is for their
use, toggle this option to reserved
Set Link Interface Type:
Location: Main
Ä Configuration
Ä WAN Set Up
Ä Link Set Up
Ä T1/E1 Set Up
Ä Slot/Channel Set Up
Ä E1 Timeslot 16
reserved
7