ZyXEL Communications Multi-service Access Platform MSAP2000 - Manual (Page 23)

2. System Architecture
MSAP2000 Technical Manual V3.0 2-3
2.3. NG DLC
As a legacy Digital Loop Carrier (DLC), MSAP2000 uses
European-standard PCM voice digital coding techniques. Each
COT can be linked to 16 RTs, to provide up to 7560 lines of voice
services. MSAP2000 supports interfaces for POTS, Payphones,
2W/4W E&M, ISDN, E1 digital leased lines, Ethernet, and
G.SHDSL. MSAP2000’s capacity can be expanded by stacking
shelves upon each other, and depending on individual
requirements, its COT/RT can provide up to 16, 30, 60, 120, 240,
360, 480, 600, 720, 960, or 1890 lines capacity.
Inter-trunking
MSAP2000 uses E1 copper lines, STM-1/STM-4 optic fibers, or
externally added microwave devices to serve as the inter-trunk
between COT and RT. Its inter-trunk is equipped with 1+1
Protection, to ensure transmission stability.
VF Interface to
PSTN
MSAP2000 supports connection of 2-wire Voice Frequency (VF)
interfaces to PSTN switches. MSAP2000 adapts 1:1
non-concentrated operation, to ensure that the caller ID is
transmitted to the subscriber’s telephone.
V5.1/V5.2
MSAP2000 supports V5.1/V5.2 interfaces which conform to ITU-T
G.964, G.965, TCN 68-185:1999 standards and has passed IOT
test with the following switch: EWSD/hiE9200, NEAX, NEC,
Lucent, Huawei, ZTE, Ecrisson. The protocol supported include:
LAPV5-EF (Envelope Function), LAPV5-DL (Data Link), V5-Link
Control, V5-BCC (Bearer Channel Connection), V5-PSTN,
V5-Control, V5-Protection. Each V5.2 interface can support up to
16 E1 interfaces, and 480 voice ports, with 1:1 concentration
ratio. MSAP2000’s V5.2 Protocol processor is located on its
V5P module. One V5P module simultaneously supports four
V5.2 switch interfaces; meaning that one MSAP2000 system
provides four V5.2 interfaces; this amounts to 63 E1 capacities,
which will support 7560 voice ports. V5P also supports 1:N
functions.
Topology
MSAP2000 supports various network topologies, including
Point-to-Point, Point-to-multipoint, Linear, Tree and Branch, and
Ring.