Tandberg Data 7000 - Manual (Page 77)

TANDBERG Videoconferencing System
77
Advanced use
Advanced ISDN Settings
This is the same menu as for ISDN-BRI. The settings will be common for ISDN BRI and ISDN PRI. Please refer to
section ‘ISDN-BRI Settings’.
Line Settings
‘T1 Cable Length 1’ specifies the distance to the CSU connected to the ‘E1/T1 1’ port on codec 1. Cable Length 2
specifies the cascading distance from the ‘E1/T1 2’ port on codec 1 to the ‘E1/T1 1’ port on codec 2. Possible
values are 0-115 feet, 80-215 feet, 180-310 feet, 280-410 feet, 375-510 feet, 475-605 feet, 575-690 feet.
CRC-4 is used for most E1-PRI configurations. You can turn it off if not supported by your E1 network equipment.
For further information refer to appendix 3: Connecting the system to PRI/T1
In the example on the previous page, the unit will start searching for available B-channels at channel 20, since
‘Search’ is set to ‘High’ and ‘High Channel’ is set to 20. The unit will not search for channels below 10, since ‘Low
Channel’ is set to 10. Furthermore if the user tries to make an 8 channel call, the call will be established with 6
channel, since ‘Max Channels’ is set to 6.