Verilink C100 (880-502893-001) Product Manual - Manual (Page 21)

Introduction
06/17/97 C100 and C150 T1/FT1 CSU/DSU 1-9
Figure 1-11 shows a typical application for the CSU/DSU connecting
two sites over a T-1 facility. In this application, the user is using 224K
bps (4 DS-0s) for the router-to router communications and the
remaining 1120K bps (20 DS-0s) for PBX to PBX voice communications.
The PBX in this application happens to be over 100 floors away. Since
the C150 T-1 CSU/DSU has a long haul T-1 CSU on the DSX-1
interface, only one additional CSU, instead of two, is needed to
connect to the 104th floor.
Figure 1-11 C150s connect two sites over T1 with the PBX many floors from the remote site
Local Sit
NI
CI DSX1
CI Sync
................
ROUTER
TEL-LINK
T-1 CSU/DSU
NI
................
TEL-LINK
T-1 CSU/DSU
PBX
CI DSX1
CI Sync ROUTER
Remote Site
Basement
................
TEL-LINK
T-1 CSU/DSU
CI DSX1
PBX
Remote Site
104 th Floor
NI
NETWORK
C150
C150
C150
104th