Oms 1260 Tributary Groups; Figure 2-7: Oms 1260 (With Stm-1/4 Core) Tributary Groups Showing Bandwidth Available - Ericsson Marconi OMS 1200 Product Description

2.5.6

OMS 1260 Tributary Groups

Due to the large number of backplane tributary-to-LTU interface connections required,
it is not possible to combine the 63 x 2Mbit/s and generic tributary functions into a
single slot. OMS 1260 therefore uses dedicated 2M tributary card slots each of which
is associated with an adjacent generic tributary card slot. This pair of slots is known as
a 'Tributary Group'.
The two tributary slots in each tributary group share common interface connections to
the switch units as shown in Figure 2-7 and are therefore mutually exclusive. For each
tributary group, a slide mechanism at the front of the OMS 1260 subrack prevents
incorrect card installation by physically preventing insertion of more than one card into
that tributary group.
Note:
As shown in Figure 2-7 and Figure 2-8, Tributary Groups 1 to 3 plus the 2Mbit/s slot of
Tributary Group 4 each have a bandwidth equivalent to 2 x STM-1: The generic
tributary slot of Tributary Group 4 and Generic Tributary Slots 5 to 7 each have a
bandwidth equivalent to 4 x STM-1. Generic Tributary Slots 6 and 7 have no
connection to the switch when an STM-1/4 core is fitted.
Figure 2-7: OMS 1260 (with STM-1/4 Core) Tributary Groups Showing Bandwidth
221 02-ZAP 701 25/1 Rev C 2006-08-04
03PHB00004AAV-CUA
Generic Tributary Card Slots 5, 6 and 7 are not associated with 2M tributary
cards, i.e. they do not belong to any tributary group.
Technical Product Description
Available
© Ericsson AB 2006
Commercial in confidence
Marconi OMS 1200
31 (136)