Your post is not specific about what kind of connection you have and implies that it is a traditional leased line point to point. Is this the case? If you currently have a 1 Mbps line then is it a partial T1? If management want to upgrade capacity they could perhaps upgrade the existing line to full T1. As you comment that would get up to about 1.5 Mbps. If they really want 2 Mbps then they will need to order a second connection.
A T1 uses 23 channels (sometimes called DS0). A full rate T1 the customer uses all 23 channels and the link operates at 1.5 Mbps. Sometimes the customer does not need the full bandwidth of T1 and will lease a partial T1 which utilizes only some of the channels and will operate at some lesser bandwidth (perhaps 512 Mbps or 768 Mbps).
A traditional leased line is a point to point serial link. I made the comment about traditional leased line because it was not clear to me what the nature of the WAN connection that you were speaking about. In today's environment the WAN may be a traditional leased line but it may also be something like ADSL or Metro Ethernet, or some other media. If your WAN had been one of these other media then upgrade from 1 Mbps to 2 Mbps might be possible without adding any additional interfaces.
The critical point, is understanding what technology standard is being used. In this instance, whether T1 or E1 links are being used. Important because it determines the maximum bandwidth that can be provided on either one such link, 1.5 Mbps or 2 Mbps.
If you need more bandwidth than can be obtained by one T1 or E1, providers will often provide multiple T1s or E1s or a larger size, often the T3 or E3, about 45 Mbps and 34 Mbps, these too often can be used fractionally.
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