Vanguard Managed Solutions Vanguard 7300 Series - Manual (Page 57)

Vanguard 7300 Enclosures and Components 2-25
Vanguard 7300 Cards
T1/E1/PRI Card and Rear Transition Module
Introduction T1/E1/PRI card functions are provided by a two-part card that occupies a single
Vanguard 7300 chassis slot: the T1/E1/PRI card and the T1/E1/PRI Rear Transition
Module, which is shielded with an attached metal jacket. The following versions of
the T1/E1/PRI card are available:
• 8 -Port
• 12-port
Ports 1 and 2 can be cabled for either voice or data (but not both); ports 3 through 8
or 12 are data-only.
T1/E1/PRI Card
The T1/E1/PRI card offers high-density termination of voice and data traffic on the
same card. Each card can support up to 12 physical rear transition module ports.
Each port can be configured to run as an independent T1, E1, or ISDN PRI port.
T1/E1/PRI Rear Transition Module
The metal-jacket-shielded T1/E1/PRI rear transition module connects to the T1/E1/
PRI card and provides 12 RJ48C rear panel connectors. There is only a 12-port
version of the T1/E1/PRI rear transition module; the 8-port version has 12 physical
ports, but only eight of those ports function. Voice transmission is available only on
ports 1 and 2.
T1/E1/PRI Card
Functions The T1/E1/PRI card supports:
• Channelized or fractional T1/E1 support
• ISDN PRI to support dial-backup or bandwidth-on-demand voice operations
• Up to 24 channels for each physical T1 or T1/PRI port and up to 31 channels
for each physical E1 or E1/PRI port
• Voice functions with the optional Voice Server/DSP PMC installed
• Termination of voice and data traffic on different ports of the same card (with
a Voice Server/DSP PMC installed)
T1/E1/PRI Timing
Considerations The T1/E1/PRI card can accept up to three independent clock sources; however, all
circuits connected to ports 1 through 4 must be synchronized to the same source to
prevent frame slips.
Similarly, ports 5 through 8 can be synchronized to a different clock source from 1
through 4, but must all be synchronized to the same source. Ports 9 through 12
comprises a third timing group.
Voice connections can be connected only to ports 1 and 2. Voice and data cannot be
combined on a single T1/E1/PRI port. For example, when you designate port 1 as a
voice port, it cannot carry data. Similarly, you can specify port 2 as either voice or
data, but never both, and ports 3 through 12 are restricted to data only.