MIL-STD-188-176
N-ISDN networks. Interworking between narrowband ISDN user part (N-ISUP, ANSI T1.113) and broadband ISDN user part (B-ISUP, ITU-T Q.2764) shall be in accordance with ITU-T Q.2660. Interworking supports basic call and supplementary services. This case of interworking is also relevant to interworking between users on N- ISDN and users on B-ISDN, as illustrated in Figure 13b. In the user plane, a N-ISDN circuit shall be emulated for each VCC,
using AAL 1, as specified in AF SAA 0032.000.
5.5.2.2 Frame relay networks . ATM networks may be used to interconnect two frame relay networks, as shown in Figure 14a.
The network interworking unit between the frame relay network and the ATM network shall comply with FRF.5. A frame relay service user may interwork with an ATM service user that performs no
frame relaying functions. In this case all interworking is performed by the interworking function, as shown in Figure 14b, and the interworking function shall comply with FRF.8.
5.5.2.3 Internet protocol (IP) router subnetworks . Interworking between ATM networks and IP router networks shall be in accordance with RFC 1577. User datagrams shall be
encapsulated in AAL 5 CPCS PDUs, in accordance with RFC 1626. An example of IP/ATM interworking is illustrated in Figure 15. In this case the media access control (MAC) sublayer could be that
of any IEEE 802 series LAN, or FDDI.
5.5.2.4 Switched multi-megabit data service . Switched multi-megabit data service (SMDS), is a Bellcore proprietary development specified in Bellcore Technical Reference TR-TSV-
000772. SMDS is a connectionless public packet-switched data service that provides for the transfer of variable-length data units (up to 9188 octets of information) at high speeds. The operation and features of SMDS are similar to those found in high-speed data networks and LANs. SMDS provides a datagram
packet transfer, by which each data unit is handled and switched separately without the prior establishment of a network connection. The variable-length data units are segmented for transmission, with each segment placed into 53-byte cells using AAL 3/4. Open-commercial standards for the SMDS subscriber network interface have not been developed. Interworking between ATM networks and SMDS shall be in accordance with the SMDS Interest Group document SIG-TWG-008. SMDS interworking is illustrated in Figure 16.
5.6 Base network management . Network management requirements for base networks are given in 5.6.1 to 5.6.3.
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