Specifications

ENT_MLE_015989 - Ed 02_2014-10-13
Chapter 13: Topology – Network Services
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Alcatel-Lucent Enterprise Communication Solutions
April 2014 Offer
3.1.2 Private ABC networks using TDM leased lines
Systems can be interconnected using:
– G.703/G.704 T1/E1 leased lines. ABC signaling is transported using TS16. Voice is
transported in remaining digital frames
– Systems can be interconnected using several T1/E1 interfaces or a part of a single T1/E1
(fractional T1/E1). It is also possible to provide ABC-VPN over leased lines. If the leased
line is saturated, additional calls are routed over the public network (providing that the
user has the correct class of service)
Note: ABC networking over analog leased lines is also supported. In this case, the Crystal media
gateway is used to provide the tie line interfaces required (ACEM, EMTL boards).
3.1.3 ABC virtual private networks (VPNs) on ISDN/PSTN networks
ABC VPN and leased lines
Cost restrictions related to private network designs often lead to bandwidth limitations. However, to
provide maximum availability, private links must be sized to support peaks in network traffic. This
results in some bandwidth being unused for long periods of time, and it increases monthly lease
expenses. The best way to optimize bandwidth is to reduce the number of leased lines based on