VeEX VePAL TX300M, Руководство пользователя

Страница: 52 / 421

Channel Selection:
The Tx channel is selected by entering the STS-N, VT-GRP, and VT-1.5 SPE channel.
Bulk:
Tap the check box to enable the setting. In Bulk mode, the entire VT container is filled with a test pattern per ITU-T 0.181
recommendations.
Tributary:
Preset to DS1, E1, DS3, and E3 depending upon the options and mapping.
Tx Structure Setup - Tributary
Note:
VT-GRP:
In order to carry a mixed size of VTs in a STS-1 SPE in an efficient manner, VT Group (VTG) is defined. The
size of the VTG is 12 columns, which is the least common multiple of the four sizes of VTs. Only one type of VT can be
contained within each VTG. Therefore, a VTG can be formed by byte interleave multiplexing 3 VT-2s and 4 VT-1.5s
VT-1.5
: Each VT 1.5 frame consists of 27 bytes (3 columns of 9 bytes) These bytes provide a transport capacity of
1.728Mbps, and thus, can accommodate the transport of a DS1 signal. 28 VT 1.5s may be multiplexed into the STS-1
SPE.
VT-2
: Each VT-2 frame consists of 36 bytes (4 columns of 9 bytes) These bytes provide a transport capacity of
2.304Mbps, and can accommodate the transport one E1 signal. 21 VT-2s may be multiplexed into the STS-1 SPE.
The tributary numbering used above is per Bellcore GR.253/ANSI T1.105 standard.
Go back to top Go back to TOC
TX300S_e-manual_D07-00-064P_RevA00